CN113237843A - Non-dispersive infrared gas analysis circuit and analysis method based on embedded system - Google Patents
Non-dispersive infrared gas analysis circuit and analysis method based on embedded system Download PDFInfo
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Abstract
The invention relates to a non-dispersive infrared gas analysis circuit and an analysis method based on an embedded system. The main control circuit performs compensation processing and display on the concentration value by combining with the environmental information monitored by the environmental monitoring assembly, and the man-machine interaction circuit can adjust the frequency of the light source so as to adjust the intensity of the partially absorbed infrared light, thereby obtaining a gas concentration analysis result so as to be suitable for different types of gas analysis.
Description
Technical Field
The invention relates to the technical field of gas concentration analysis, in particular to a non-dispersive infrared gas analysis circuit and an analysis method based on an embedded system.
Background
The principle applied to measuring gas concentration using a non-dispersive infrared gas analyzer is beer's law, whose formula is as follows:
I＝I0*e-KCL
wherein, each letter means as follows: i is the intensity of infrared light absorbed by the gas to be measured in the sample gas, I0The intensity of infrared light not absorbed by the reference gas; k is the absorption coefficient of the gas to be detected in the sample gas to infrared light, C is the concentration of the gas to be detected in the sample gas, and L is the length of the gas chamber.
For a non-dispersive infrared gas analysis device, the gas to be measured in the measured sample gas is determined, namely the infrared absorption coefficient k of the gas to be measured to the radiation wave band is certain, and the length L of the gas chamber is certain. From beer's law it can be seen that: by measuring the intensity I of infrared light not absorbed by the gas to be measured0The concentration C of the gas to be treated can be determined by the intensity I of the absorbed infrared light.
The existing non-dispersive infrared gas analyzer cannot be used as matched development equipment for gas analysis, and cannot be used universally and aim at specific infrared light, so that the infrared light absorption coefficient is also isolated, the gas analyzer cannot be used for analyzing gas concentrations with different absorption degrees, cannot adapt to different types and different types of gas analysis, and brings difficulty and time cost for development work.
Disclosure of Invention
The present invention provides a non-dispersive infrared gas analysis circuit and an analysis method based on an embedded system, aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: a non-dispersive infrared gas analysis circuit based on an embedded system comprises a detection component, a signal processing circuit, a main control circuit, a light source frequency modulation circuit, a light source, an environment monitoring circuit, a man-machine interaction circuit and a power circuit, the output end of the detection component is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit and the output end of the environment monitoring circuit are respectively and electrically connected with the signal input end of the main control circuit, the signal output end of the main control circuit is electrically connected with the input end of the light source frequency modulation circuit, the human-computer interaction circuit is electrically connected with the main control circuit, the output end of the light source frequency modulation circuit is electrically connected with the light source, the power supply circuit is respectively and electrically connected with the signal processing circuit, the main control circuit, the light source frequency modulation circuit, the light source, the man-machine interaction circuit and the environment monitoring circuit;
the detection assembly is used for detecting the target gas in real time to obtain infrared light intensity information partially absorbed by the target gas and sending the infrared light intensity information to the signal processing circuit;
the signal processing circuit is used for carrying out signal processing on the infrared light intensity information and sending the infrared light intensity information to the main control circuit;
the environment monitoring assembly is used for monitoring environment information in real time and sending the environment information to the main control circuit;
the main control circuit is used for calculating the concentration value of the target gas according to the infrared light intensity information after signal processing and directly reading the environmental parameter value according to the environmental information; the device is also used for compensating the concentration value of the target gas according to the environmental parameter value and respectively displaying the compensated concentration value and the environmental parameter value on a display screen;
the man-machine interaction circuit receives a light source frequency setting command;
and the main control circuit is also used for generating a driving signal according to the light source frequency setting command, controlling the light source frequency modulation circuit to drive the light source to adjust the frequency, and repeating the steps to obtain an analysis result of the concentration of the target gas.
The invention has the beneficial effects that: according to the non-dispersive infrared gas analysis circuit based on the embedded system, the detection assembly is used for detecting infrared light intensity information after being partially absorbed by the target gas, the concentration value of the target gas is calculated by the main control circuit after being processed by the signal processing circuit, the main control circuit is used for compensating and displaying the concentration value in combination with the environment information monitored by the environment monitoring assembly, meanwhile, the human-computer interaction circuit can be used for adjusting the frequency of the light source so as to adjust the infrared light intensity after being partially absorbed, and therefore a gas concentration analysis result is obtained.
On the basis of the technical scheme, the invention can be further improved as follows:
further: the detection assembly comprises an air chamber and a detector, wherein an optical channel is arranged between two ends of the air chamber in a penetrating mode, the detector and the light source are arranged at two ends of the air chamber in a sealing mode respectively, and the emergent optical fibers of the light source irradiate to a receiving area of the detector through the optical channel.
The beneficial effects of the further scheme are as follows: the detector and the light source are respectively arranged at two ends of the air chamber in a sealing manner, so that part of infrared light energy emitted by the light source can be absorbed to be incident to a receiving area for detection so as to be received by the detector, and the intensity information of part of absorbed infrared light can be accurately detected, so that the concentration of the target group gas can be accurately calculated in the subsequent process.
Further: the signal processing circuit comprises a front-end signal conditioning circuit and a rear-end signal conditioning circuit, the front-end signal conditioning circuit comprises a front-end measuring signal conditioning circuit and a front-end reference signal conditioning circuit, and the rear-end signal conditioning circuit comprises a rear-end measuring signal conditioning circuit and a rear-end reference signal conditioning circuit;
the measuring signal output end of the detector is electrically connected with the input end of the front-end measuring signal conditioning circuit, the output end of the front-end measuring signal conditioning circuit is electrically connected with the input end of the rear-end measuring signal conditioning circuit, and the output end of the rear-end measuring signal conditioning circuit is electrically connected with the measuring signal input end of the main control circuit;
the reference signal output end of the detector is electrically connected with the input end of the front-end reference signal conditioning circuit, the output end of the front-end reference signal conditioning circuit is electrically connected with the input end of the rear-end reference signal conditioning circuit, and the output end of the rear-end reference signal conditioning circuit is electrically connected with the reference signal input end of the main control circuit.
The beneficial effects of the further scheme are as follows: can amplify the sinusoidal signal in measuring signal and the conditioned signal respectively through front end measuring signal conditioning circuit and front end reference signal conditioning circuit, and do not fall direct current signal wherein and amplify to restrain the signal and look for that high frequency noise, improve the function of SNR, make the signal possess stronger interference killing feature when carrying out remote transmission, give rear end signal conditioning circuit with effectual output signal and handle, rear end signal conditioning circuit carries out high frequency filtering and further enlarged function to the signal, overturns sinusoidal signal simultaneously, is about to sinusoidal negative semi-axis upset, makes negative voltage signal become the positive voltage signal, satisfies signal processing circuit's sampling condition.
Further: the front-end measurement signal conditioning circuit comprises an operational amplifier U17, a resistor R709, a resistor R710, a capacitor C64, a resistor R711 and a capacitor C68, wherein the non-inverting input end of the operational amplifier U17 is electrically connected with the detection signal output end of the detector, the non-inverting input end of the operational amplifier U17 is grounded through the resistor R709, the resistor R710 and the capacitor C64 are sequentially connected in series between the inverting input end of the operational amplifier U17 and the ground, the resistor R711 and the capacitor C68 are connected in parallel between the inverting input end and the output end of the operational amplifier U17, and the output end of the operational amplifier U17 is electrically connected with the input end of the rear-end measurement signal conditioning circuit;
the front-end reference signal conditioning circuit comprises an operational amplifier U19, a resistor R713, a capacitor C70, a resistor R714, a resistor R713 and a capacitor C71, wherein a non-inverting input end of the operational amplifier U19 is electrically connected with a reference signal output end of the detector, a non-inverting input end of the operational amplifier U19 is grounded through the resistor R713, the resistor R714 and the capacitor C70 are sequentially connected between an inverting input end of the operational amplifier U19 and the ground in series, the resistor R715 and the capacitor C71 are connected between an inverting input end and an output end of the operational amplifier U19 in parallel, and an output end of the operational amplifier U19 is electrically connected with an input end of the rear-end reference signal conditioning circuit.
The beneficial effects of the further scheme are as follows: the operational amplifier U17 and the operational amplifier U19 form a signal processing circuit with two channels, a negative feedback network is formed by the capacitor C64, the resistor R60, the resistor R61 and the capacitor C68 together, amplification of a measurement signal is achieved, meanwhile, the capacitor C61 is connected with the capacitor C68 in parallel to inhibit amplification of a high-frequency signal, the capacitor C64 is connected with the resistor R60 in series to inhibit amplification of a direct-current component in an original signal, and therefore the amplified signal is only a useful alternating-current signal output by the sensor.
Further: the rear-end measurement signal conditioning circuit comprises a variable resistor R69, a resistor R71, a capacitor C72, a resistor R66, an operational amplifier U20A, a resistor R73, a capacitor C74, a resistor R67, an operational amplifier U21C, a capacitor C73, a Schottky diode D10, a resistor R68, a resistor R70, an operational amplifier U21 70 and a resistor R70, wherein the output end of the front-end measurement signal conditioning circuit is electrically connected with the non-inverting input end of the operational amplifier U20 70 through the capacitor C70, the non-inverting input end of the operational amplifier U20 70 is grounded through the resistor R70, the resistor R70 and the variable resistor R70 are sequentially connected in series between the inverting input end of the operational amplifier U20 70 and the ground, the resistor R70 and the capacitor C70 are connected in parallel between the inverting input end and the output end of the operational amplifier U20 70, the output end of the operational amplifier U20 70 is electrically connected with the non-inverting input end of the operational amplifier U70 through the resistor R70, the capacitor C73 is electrically connected between the inverting input end and the output end of the operational amplifier U21C, the inverting input end and the output end of the operational amplifier U21C are respectively and correspondingly electrically connected with the pin No. 1 and the pin No. 3 of the schottky diode D10, the pin No. 2 of the schottky diode D10 is grounded through the resistor R68, the pin No. 2 of the schottky diode D10 is electrically connected with the non-inverting input end of the operational amplifier U21D, the inverting input end of the operational amplifier U21D is electrically connected with the non-inverting input end of the operational amplifier U21C through the resistor R70, the resistor R72 is electrically connected between the inverting input end and the output end of the operational amplifier U21D, and the output end of the operational amplifier U21D is electrically connected with the measurement signal input end of the main control circuit;
the back-end reference signal conditioning circuit comprises a capacitor C75, a resistor R74, a variable resistor R77, a resistor R79, an operational amplifier U20B, a resistor R81, a capacitor C77, a resistor R75, an operational amplifier U21B, a capacitor C76, a Schottky diode D11, a resistor R76, a resistor R78, an operational amplifier U22 78 and a resistor R78, wherein the output end of the front-end reference signal conditioning circuit is electrically connected with the non-inverting input end of the operational amplifier U20 78 through the capacitor C78, the non-inverting input end of the operational amplifier U20 78 is grounded through the resistor R78, the resistor R78 and the variable resistor R78 are electrically connected between the inverting input end of the operational amplifier U20 78 and the ground in sequence, the resistor R78 and the capacitor C78 are connected between the inverting input end and the output end of the operational amplifier U20 78 in parallel, the output end of the operational amplifier U20 78 is electrically connected with the non-inverting input end of the operational amplifier U78 through the resistor R78, the capacitor C76 is electrically connected between the inverting input end and the output end of the operational amplifier U21B, the inverting input end and the output end of the operational amplifier U21B are respectively and correspondingly electrically connected with the pin 1 and the pin 3 of the schottky diode D11, the pin 2 of the schottky diode D11 is grounded through the resistor R76, the pin 2 of the schottky diode D11 is electrically connected with the non-inverting input end of the operational amplifier U22C, the inverting input end of the operational amplifier U22C is electrically connected with the non-inverting input end of the operational amplifier U21B through the resistor R78, the resistor R80 is electrically connected between the inverting input end and the output end of the operational amplifier U22C, and the output end of the operational amplifier U22C is electrically connected with the reference signal input end of the main control circuit.
The beneficial effects of the further scheme are as follows: the capacitor C72, the resistor R66 and the operational amplifier U20A jointly form an active high-pass filter, signals with the frequency lower than the signal cut-off frequency are restrained and cannot be transmitted to a next-stage circuit, therefore, direct current signals and low-frequency noise signals are filtered, the resistor R69, the resistor R71, the resistor R73 and the capacitor C74 jointly form a negative feedback circuit, the signals are amplified in the same direction, the R60 is an adjustable resistor, the amplification factor can be adjusted, finally output signals are kept to the same level, and convenience is brought to back-end processing.
Further: the light source frequency modulation circuit comprises a boosting chip U2, an inductor L1, a resistor R2, a resistor R3, a capacitor C2, a capacitor C5, a capacitor C6, a resistor R1 and a MOS tube Q1, wherein a power supply input end of the boosting chip U2 is electrically connected with a +5V output end of a power supply circuit, a power supply input end of the boosting chip U2 is grounded through the capacitor C6, two inductor connecting ends of the boosting chip U2 are respectively electrically connected with two ends of the inductor L1, a ground end of the boosting chip U2 is grounded, an output end of the boosting chip U2 is electrically connected with the power supply input end of the light source, an output end of the boosting chip U2 is grounded through the capacitor C2, the resistor R2 is electrically connected between the output end and a feedback input end of the boosting chip U2, a feedback input end of the boosting chip U2 is grounded through the resistor R3, an enabling end of the boosting chip U2 is grounded through the capacitor C5, the grid electrode of the MOS tube Q1 is electrically connected with the signal output end of the main control circuit, the source electrode of the MOS tube Q1 is grounded, and the drain electrode of the MOS tube Q1 is electrically connected with the control signal input end of the light source.
The beneficial effects of the further scheme are as follows: the boost chip U2 provides a stable and reliable power supply for the light source, the MOS tube Q1 and the resistor R1 form a switching circuit, and the switching frequency of the MOS tube Q1 is controlled by the PWM wave output by the main control circuit, so that the frequency of the light source is controlled.
Further: the environment monitoring circuit comprises an air pressure monitoring circuit and a temperature monitoring circuit, and the output ends of the air pressure monitoring circuit and the temperature monitoring circuit are respectively electrically connected with the environment signal input end of the main control circuit.
The beneficial effects of the further scheme are as follows: the atmospheric pressure monitoring circuit and the temperature monitoring circuit can respectively monitor atmospheric pressure information and temperature information in the environment, and the measured gas concentration value is corrected by utilizing the environmental data, so that higher-precision concentration measurement data is obtained, and the use requirements under different scenes are met.
Further: the man-machine interaction circuit comprises a key and a display screen, and the key and the display screen are respectively electrically connected with the interaction port of the main control circuit.
The beneficial effects of the further scheme are as follows: a light source frequency setting command can be input through the key, so that the main control circuit can generate a driving signal according to the light source frequency setting command so as to drive the light source to adjust the frequency, the intensity of the partially absorbed infrared light is adjusted, and the concentration of different kinds of gas is measured.
Further: the non-dispersive infrared gas analysis circuit based on the embedded system further comprises a communication circuit, the main control circuit is electrically connected with the communication circuit, and the communication circuit is electrically connected with an external receiving terminal.
The beneficial effects of the further scheme are as follows: the communication circuit can be directly in communication connection with an external receiving terminal, so that data interaction between the communication circuit and the receiving terminal is conveniently realized, and test data are sent to the receiving terminal so as to carry out data analysis and processing in the next step.
The invention also provides an analysis method based on the embedded system non-dispersive infrared gas analysis circuit, which comprises the following steps:
initializing an analysis circuit, detecting the target gas by a detection assembly in real time to obtain the concentration information of the target gas, and sending the concentration information to a signal processing circuit;
the signal processing circuit carries out signal processing on the concentration information and sends the concentration information to the main control circuit;
the environment monitoring assembly monitors environment information in real time and sends the environment information to the main control circuit;
the main control circuit reads the concentration value of the target gas according to the concentration information after signal processing and directly reads the environmental parameter value according to the environmental information;
and the main control circuit performs compensation processing on the concentration value of the target gas according to the environment parameter value, and respectively displays the concentration value and the environment parameter value after the compensation processing on a display screen.
The man-machine interaction circuit receives a light source frequency setting command, the main control circuit generates a driving signal according to the light source frequency setting command and sends the driving signal to the light source frequency modulation circuit, the light source frequency modulation circuit adjusts the light source frequency according to the driving signal, and the steps are repeated to obtain an analysis result of the concentration of the target gas.
The analysis method based on the embedded system non-dispersive infrared gas analysis circuit detects infrared light intensity information after being partially absorbed by target gas through the detection assembly, the concentration value of the target gas is calculated by the main control circuit after being processed by the signal processing circuit, the main control circuit performs compensation processing and display on the concentration value by combining with the environment information monitored by the environment monitoring assembly, meanwhile, the human-computer interaction circuit can adjust the frequency of a light source to adjust the infrared light intensity after being partially absorbed, so that a gas concentration analysis result is obtained, the method can be suitable for different types of gas analysis, is simple to operate, has accurate detection result, greatly facilitates development work, and saves time cost.
Drawings
FIG. 1 is a schematic structural diagram of a non-dispersive infrared gas analysis circuit based on an embedded system according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a front-end signal conditioning circuit according to an embodiment of the invention;
FIG. 3 is a circuit diagram of a back-end signal conditioning circuit according to an embodiment of the invention;
fig. 4 is a circuit diagram of a light source frequency modulation circuit according to an embodiment of the invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in figure 1, the non-dispersive infrared gas analysis circuit based on the embedded system comprises a detection assembly, a signal processing circuit, a main control circuit, a light source frequency modulation circuit, a light source, an environment monitoring circuit, a man-machine interaction circuit and a power supply circuit, wherein the output end of the detection assembly is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit is electrically connected with the output end of the environment monitoring circuit and the signal input end of the main control circuit respectively, the signal output end of the main control circuit is electrically connected with the input end of the light source frequency modulation circuit, the man-machine interaction circuit is electrically connected with the main control circuit, the output end of the light source frequency modulation circuit is electrically connected with the light source, and the power supply circuit is respectively connected with the signal processing circuit, the main control circuit, the light source frequency modulation circuit, The light source, the man-machine interaction circuit and the environment monitoring circuit are electrically connected.
The detection assembly is used for detecting the target gas in real time to obtain infrared light intensity information partially absorbed by the target gas and sending the infrared light intensity information to the signal processing circuit;
the signal processing circuit is used for carrying out signal processing on the infrared light intensity information and sending the infrared light intensity information to the main control circuit;
the environment monitoring assembly is used for monitoring environment information in real time and sending the environment information to the main control circuit;
the main control circuit is used for calculating the concentration value of the target gas according to the infrared light intensity information after signal processing and directly reading the environmental parameter value according to the environmental information; the device is also used for compensating the concentration value of the target gas according to the environmental parameter value and respectively displaying the compensated concentration value and the environmental parameter value on a display screen;
the man-machine interaction circuit receives a light source frequency setting command;
and the main control circuit is also used for generating a driving signal according to the light source frequency setting command, controlling the light source frequency modulation circuit to drive the light source to adjust the frequency, and repeating the steps to obtain an analysis result of the concentration of the target gas.
According to the non-dispersive infrared gas analysis circuit based on the embedded system, the detection assembly is used for detecting infrared light intensity information after being partially absorbed by the target gas, the concentration value of the target gas is calculated by the main control circuit after being processed by the signal processing circuit, the main control circuit is used for compensating and displaying the concentration value in combination with the environment information monitored by the environment monitoring assembly, meanwhile, the human-computer interaction circuit can be used for adjusting the frequency of the light source so as to adjust the infrared light intensity after being partially absorbed, and therefore a gas concentration analysis result is obtained.
In one or more embodiments of the present invention, the detection assembly includes a gas chamber and a detector, wherein an optical channel is disposed between two ends of the gas chamber, the detector and the light source are respectively disposed at two ends of the gas chamber in a sealed manner, and an optical fiber emitted from the light source irradiates the receiving area of the detector via the optical channel. The detector and the light source are respectively arranged at two ends of the air chamber in a sealing manner, so that part of infrared light energy emitted by the light source can be absorbed to be incident to a receiving area for detection so as to be received by the detector, and the intensity information of part of absorbed infrared light can be accurately detected, so that the concentration of the target group gas can be accurately calculated in the subsequent process.
In order to conveniently find the optimal length of the air chamber, in practice, the air chambers with different lengths can be replaced according to needs, so that the test environment can be changed in a short time to obtain different test data, and the analysis of the measured data result is facilitated.
In one or more embodiments of the present invention, the signal processing circuit includes a front-end signal conditioning circuit and a back-end signal conditioning circuit, the front-end signal conditioning circuit includes a front-end measurement signal conditioning circuit and a front-end reference signal conditioning circuit, and the back-end signal conditioning circuit includes a back-end measurement signal conditioning circuit and a back-end reference signal conditioning circuit.
The measuring signal output end of the detector is electrically connected with the input end of the front-end measuring signal conditioning circuit, the output end of the front-end measuring signal conditioning circuit is electrically connected with the input end of the rear-end measuring signal conditioning circuit, and the output end of the rear-end measuring signal conditioning circuit is electrically connected with the measuring signal input end of the main control circuit;
the reference signal output end of the detector is electrically connected with the input end of the front-end reference signal conditioning circuit, the output end of the front-end reference signal conditioning circuit is electrically connected with the input end of the rear-end reference signal conditioning circuit, and the output end of the rear-end reference signal conditioning circuit is electrically connected with the reference signal input end of the main control circuit.
Can amplify the sinusoidal signal in measuring signal and the conditioned signal respectively through front end measuring signal conditioning circuit and front end reference signal conditioning circuit, and do not fall direct current signal wherein and amplify to restrain the signal and look for that high frequency noise, improve the function of SNR, make the signal possess stronger interference killing feature when carrying out remote transmission, give rear end signal conditioning circuit with effectual output signal and handle, rear end signal conditioning circuit carries out high frequency filtering and further enlarged function to the signal, overturns sinusoidal signal simultaneously, is about to sinusoidal negative semi-axis upset, makes negative voltage signal become the positive voltage signal, satisfies signal processing circuit's sampling condition.
When the detector works, an output original signal is an alternating current sinusoidal signal, the signal frequency is the light source frequency, the amplitude of the sinusoidal signal at the moment is extremely small and is about 2-3mV, and the signal at the moment is superposed with a direct current voltage signal of about 500-600mV, so that a signal processing circuit is arranged at the front end (close to the detector), the circuit amplifies small signals without amplifying the direct current signal, suppresses high-frequency noise in the signals, improves the signal-to-noise ratio function, enables the signals to have stronger anti-interference capability during long-distance transmission, and transmits effective output signals to the rear end for processing.
In one or more embodiments of the present invention, as shown in fig. 2, the front-end measurement signal conditioning circuit includes an operational amplifier U17, a resistor R709, a resistor R710, a capacitor C64, a resistor R711, and a capacitor C68, a non-inverting input terminal of the operational amplifier U17 is electrically connected to a detection signal output terminal of the detector, a non-inverting input terminal of the operational amplifier U17 is grounded via the resistor R709, the resistor R710 and the capacitor C64 are sequentially connected in series between an inverting input terminal of the operational amplifier U17 and ground, the resistor R711 and the capacitor C68 are connected in parallel between an inverting input terminal and an output terminal of the operational amplifier U17, and an output terminal of the operational amplifier U17 is electrically connected to an input terminal of the rear-end measurement signal conditioning circuit.
The operational amplifier U17 and the operational amplifier U19 form a signal processing circuit with two channels, a negative feedback network is formed by the capacitor C64, the resistor R60, the resistor R61 and the capacitor C68 together, amplification of a measurement signal is achieved, the amplification factor F is 1+ (R61/R60), meanwhile, the capacitor C61 and the capacitor C68 are connected in parallel, amplification of a high-frequency signal is restrained, the capacitor C64 and the resistor R60 are connected in series, amplification of a direct-current component in an original signal is restrained, and therefore the amplified signal is only a useful alternating-current signal output by a sensor.
The front-end reference signal conditioning circuit comprises an operational amplifier U19, a resistor R713, a capacitor C70, a resistor R714, a resistor R713 and a capacitor C71, wherein a non-inverting input end of the operational amplifier U19 is electrically connected with a reference signal output end of the detector, a non-inverting input end of the operational amplifier U19 is grounded through the resistor R713, the resistor R714 and the capacitor C70 are sequentially connected between an inverting input end of the operational amplifier U19 and the ground in series, the resistor R715 and the capacitor C71 are connected between an inverting input end and an output end of the operational amplifier U19 in parallel, and an output end of the operational amplifier U19 is electrically connected with an input end of the rear-end reference signal conditioning circuit. The working principle of the front-end measurement signal conditioning circuit is the same as that of the front-end measurement signal conditioning circuit, and the details are not repeated here.
In one or more embodiments of the present invention, as shown in fig. 3, the back-end measurement signal conditioning circuit includes a variable resistor R69, a resistor R71, a capacitor C72, a resistor R66, an operational amplifier U20A, a resistor R73, a capacitor C74, a resistor R67, an operational amplifier U21C, a capacitor C73, a schottky diode D10, a resistor R68, a resistor R70, an operational amplifier U21D, and a resistor R72, an output terminal of the front-end measurement signal conditioning circuit is electrically connected to a non-inverting input terminal of the operational amplifier U20A through the capacitor C72, a non-inverting input terminal of the operational amplifier U20A is grounded through the resistor R66, the resistor R71 and the resistor R69 are sequentially connected between an inverting input terminal of the operational amplifier U20A and the ground, the inverting input terminal of the operational amplifier U20A is connected in parallel to the resistor R73 and the capacitor C74, and an output terminal of the operational amplifier U20A is connected to the ground through the resistor R67, the output terminal of the operational amplifier U20A is electrically connected to the non-inverting input terminal of the operational amplifier U21C, the capacitor C73 is electrically connected between the inverting input end and the output end of the operational amplifier U21C, the inverting input end and the output end of the operational amplifier U21C are respectively and electrically connected with the pin No. 1 and the pin No. 3 of the Schottky diode D10, pin 2 of the Schottky diode D10 is grounded through the resistor R68, pin 2 of the Schottky diode D10 is electrically connected with the non-inverting input terminal of the operational amplifier U21D, the inverting input terminal of the operational amplifier U21D is electrically connected to the non-inverting input terminal of the operational amplifier U21C through the resistor R70, the resistor R72 is electrically connected between the inverting input end and the output end of the operational amplifier U21D, the output end of the operational amplifier U21D is electrically connected with the measurement signal input end of the main control circuit.
The capacitor C72, the resistor R66 and the operational amplifier U20A jointly form an active high-pass filter, signals with frequencies lower than the cut-off frequency of the signals are suppressed and cannot be transmitted to a next-stage circuit, therefore, filtering of direct-current signals and low-frequency noise signals is achieved, the resistor R69, the resistor R71, the resistor R73 and the capacitor C74 jointly form a negative feedback circuit, the signals are amplified in the same direction, the amplification factor F is 1+ (R73/(R69+ R71)), the R60 is an adjustable resistor, the amplification factor can be adjusted, the finally output signals are kept at the same level, and convenience is provided for back-end processing. The U21C, C73, D10, R68, R70, R70 and U21D jointly form a signal turnover circuit, when the signal is a positive half-cycle signal, the operational amplifier U21C has output, and finally the positive half-cycle signal is output through the U21D; when the signal is negative half cycle, the pin 8 output of the operational amplifier U21C is 0, the schottky diode D10 is turned off, and the negative half cycle signal enters the inverting input terminal of the operational amplifier U21D through R70, and finally the pin 14 output signal of the operational amplifier U21D is inverted, inverting the negative half cycle signal to the positive half cycle signal.
In one or more embodiments of the present invention, the back-end reference signal conditioning circuit includes a capacitor C75, a resistor R74, a variable resistor R77, a resistor R79, an operational amplifier U20B, a resistor R81, a capacitor C77, a resistor R75, an operational amplifier U21B, a capacitor C76, a schottky diode D11, a resistor R76, a resistor R78, an operational amplifier U22C, and a resistor R80, an output terminal of the front-end reference signal conditioning circuit is electrically connected to a non-inverting input terminal of the operational amplifier U20B through the capacitor C75, a non-inverting input terminal of the operational amplifier U20B is grounded through the resistor R74, the resistor R79 and the variable resistor R77 are electrically connected between an inverting input terminal of the operational amplifier U20B and ground in sequence, the resistor R81 and the capacitor C77 are connected between the inverting input terminal and the output terminal of the operational amplifier U20B in parallel, and the output terminal of the operational amplifier U20B is grounded through the resistor R75, the output terminal of the operational amplifier U20B is electrically connected to the non-inverting input terminal of the operational amplifier U21B, the capacitor C76 is electrically connected between the inverting input end and the output end of the operational amplifier U21B, the inverting input end and the output end of the operational amplifier U21B are respectively and electrically connected with the pin No. 1 and the pin No. 3 of the Schottky diode D11, pin 2 of the Schottky diode D11 is grounded through the resistor R76, pin 2 of the Schottky diode D11 is electrically connected with the non-inverting input terminal of the operational amplifier U22C, the inverting input terminal of the operational amplifier U22C is electrically connected to the non-inverting input terminal of the operational amplifier U21B through the resistor R78, the resistor R80 is electrically connected between the inverting input end and the output end of the operational amplifier U22C, the output end of the operational amplifier U22C is electrically connected with the reference signal input end of the main control circuit.
In one or more embodiments of the present invention, as shown in fig. 4, the light source frequency modulation circuit includes a boost chip U2, an inductor L1, a resistor R2, a resistor R3, a capacitor C2, a capacitor C5, a capacitor C6, a resistor R1, and a MOS transistor Q1, a power input end of the boost chip U2 is electrically connected to a +5V output end of the power circuit, a power input end of the boost chip U2 is grounded via the capacitor C6, two inductor connecting ends of the boost chip U2 are electrically connected to two ends of the inductor L1, a ground end of the boost chip U2 is grounded, an output end of the boost chip U2 is electrically connected to the power input end of the light source, an output end of the boost chip U2 is grounded via the capacitor C2, a resistor R2 is electrically connected between an output end and a feedback input end of the boost chip U2, a feedback input end of the boost chip U2 is grounded via the resistor R3, the enable end of the boosting chip U2 is grounded through the capacitor C5, the grid electrode of the MOS tube Q1 is electrically connected with the signal output end of the main control circuit, the source electrode of the MOS tube Q1 is grounded, and the drain electrode of the MOS tube Q1 is electrically connected with the control signal input end of the light source.
The boost chip U2 provides a stable and reliable power supply for the light source, the MOS tube Q1 and the resistor R1 form a switching circuit, and the switching frequency of the MOS tube Q1 is controlled by the PWM wave output by the main control circuit, so that the frequency of the light source is controlled.
In one or more embodiments of the present invention, the environment monitoring circuit includes an air pressure monitoring circuit and a temperature monitoring circuit, and output terminals of the air pressure monitoring circuit and the temperature monitoring circuit are respectively electrically connected to an environment signal input terminal of the main control circuit. The atmospheric pressure monitoring circuit and the temperature monitoring circuit can respectively monitor atmospheric pressure information and temperature information in the environment, and the measured gas concentration value is corrected by utilizing the environmental data, so that higher-precision concentration measurement data is obtained, and the use requirements under different scenes are met. In the embodiment of the invention, the air pressure monitoring circuit adopts a high-precision digital air pressure sensor with the model of BMP280 to realize air pressure measurement, and the sensor uses an IIC protocol to carry out data communication with the outside, thereby having the characteristics of high transmission speed, stable data and the like. The temperature monitoring circuit can be an existing temperature sensor, and details are not repeated here.
In one or more embodiments of the present invention, the human-computer interaction circuit includes a key and a display screen, and the key and the display screen are respectively electrically connected to the interaction port of the main control circuit. A light source frequency setting command can be input through the key, so that the main control circuit can generate a driving signal according to the light source frequency setting command so as to drive the light source to adjust the frequency, the intensity of the partially absorbed infrared light is adjusted, and the concentration of different kinds of gas is measured. The developer can directly display the observation data through the screen and modify the data by using the keys, thereby saving the operation of modifying in the program and downloading to the development board again, greatly saving the development cost and prolonging the service life of the singlechip.
In one or more embodiments of the present invention, the embedded system-based non-dispersive infrared gas analysis circuit further includes a communication circuit, the main control circuit is electrically connected to the communication circuit, and the communication circuit is electrically connected to an external receiving terminal. The communication circuit can be directly in communication connection with an external receiving terminal, so that data interaction between the communication circuit and the receiving terminal is conveniently realized, and test data are sent to the receiving terminal so as to carry out data analysis and processing in the next step. In the invention, the communication circuit adopts the RS232 serial port communication module, and can be directly connected with a computer to realize communication.
The non-dispersive infrared gas analysis circuit based on the embedded system provides a stable and reliable platform for gas analysis experiment tests, has the advantages of adjustable length of the gas chamber, convenient replacement of the types of the detectors and convenient replacement of the models of the light sources, and can realize the operation only by simple steps, thereby greatly reducing the consumption of a large amount of time and material resources due to the need of replacing hardware in the research and development test process, being capable of replacing and debugging various hardware devices which can be thought by developers in a short time, and further shortening the research and development period. The invention also provides a stable and reliable signal processing circuit, which processes the output signal of the sensor, has extremely high signal-to-noise ratio, furthest keeps the output of useful signals and realizes the function of measuring the concentration of the gas with high precision.
The non-dispersive infrared gas analysis circuit based on the embedded system is simultaneously provided with the air pressure measurement circuit and the temperature measurement circuit to measure the air pressure and the temperature of the current environment, and the measured gas concentration value is corrected by utilizing the environmental data, so that the concentration measurement data with higher precision is obtained. In addition, a communication circuit and a man-machine interaction circuit are also arranged, so that data can be uploaded to an upper computer or displayed directly by using a screen in the development process.
The invention also provides an analysis method based on the embedded system non-dispersive infrared gas analysis circuit, which comprises the following steps:
initializing an analysis circuit, detecting the target gas by a detection assembly in real time to obtain the concentration information of the target gas, and sending the concentration information to a signal processing circuit;
the signal processing circuit carries out signal processing on the concentration information and sends the concentration information to the main control circuit;
the environment monitoring assembly monitors environment information in real time and sends the environment information to the main control circuit;
the main control circuit reads the concentration value of the target gas according to the concentration information after signal processing and directly reads the environmental parameter value according to the environmental information;
and the main control circuit performs compensation processing on the concentration value of the target gas according to the environment parameter value, and respectively displays the concentration value and the environment parameter value after the compensation processing on a display screen.
The man-machine interaction circuit receives a light source frequency setting command, the main control circuit generates a driving signal according to the light source frequency setting command and sends the driving signal to the light source frequency modulation circuit, the light source frequency modulation circuit adjusts the light source frequency according to the driving signal, and the steps are repeated to obtain an analysis result of the concentration of the target gas.
The analysis method based on the embedded system non-dispersive infrared gas analysis circuit detects infrared light intensity information after being partially absorbed by target gas through the detection assembly, the concentration value of the target gas is calculated by the main control circuit after being processed by the signal processing circuit, the main control circuit performs compensation processing and display on the concentration value by combining with the environment information monitored by the environment monitoring assembly, meanwhile, the human-computer interaction circuit can adjust the frequency of a light source to adjust the infrared light intensity after being partially absorbed, so that a gas concentration analysis result is obtained, the method can be suitable for different types of gas analysis, is simple to operate, has accurate detection result, greatly facilitates development work, and saves time cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a based on embedded system non-dispersion infrared gas analysis circuit which characterized in that: the device comprises a detection assembly, a signal processing circuit, a main control circuit, a light source frequency modulation circuit, a light source, an environment monitoring circuit, a man-machine interaction circuit and a power supply circuit, wherein the output end of the detection assembly is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit and the output end of the environment monitoring circuit are respectively electrically connected with the signal input end of the main control circuit, the signal output end of the main control circuit is electrically connected with the input end of the light source frequency modulation circuit, the man-machine interaction circuit is electrically connected with the main control circuit, the output end of the light source frequency modulation circuit is electrically connected with the light source, and the power supply circuit is respectively electrically connected with the signal processing circuit, the main control circuit, the light source frequency modulation circuit, the light source, the man-machine interaction circuit and the environment monitoring circuit;
the detection assembly is used for detecting the target gas in real time to obtain infrared light intensity information partially absorbed by the target gas and sending the infrared light intensity information to the signal processing circuit;
the signal processing circuit is used for carrying out signal processing on the infrared light intensity information and sending the infrared light intensity information to the main control circuit;
the environment monitoring assembly is used for monitoring environment information in real time and sending the environment information to the main control circuit;
the main control circuit is used for calculating the concentration value of the target gas according to the infrared light intensity information after signal processing and directly reading the environmental parameter value according to the environmental information; the device is also used for compensating the concentration value of the target gas according to the environmental parameter value and respectively displaying the compensated concentration value and the environmental parameter value on a display screen;
the man-machine interaction circuit receives a light source frequency setting command;
and the main control circuit is also used for generating a driving signal according to the light source frequency setting command, controlling the light source frequency modulation circuit to drive the light source to adjust the frequency, and repeating the steps to obtain an analysis result of the concentration of the target gas.
2. The embedded system non-dispersive infrared-based gas analysis circuit according to claim 1, wherein: the detection assembly comprises an air chamber and a detector, wherein an optical channel is arranged between two ends of the air chamber in a penetrating mode, the detector and the light source are arranged at two ends of the air chamber in a sealing mode respectively, and the emergent optical fibers of the light source irradiate to a receiving area of the detector through the optical channel.
3. The embedded system non-dispersive infrared-based gas analysis circuit according to claim 2, wherein: the signal processing circuit comprises a front-end signal conditioning circuit and a rear-end signal conditioning circuit, the front-end signal conditioning circuit comprises a front-end measuring signal conditioning circuit and a front-end reference signal conditioning circuit, and the rear-end signal conditioning circuit comprises a rear-end measuring signal conditioning circuit and a rear-end reference signal conditioning circuit;
the measuring signal output end of the detector is electrically connected with the input end of the front-end measuring signal conditioning circuit, the output end of the front-end measuring signal conditioning circuit is electrically connected with the input end of the rear-end measuring signal conditioning circuit, and the output end of the rear-end measuring signal conditioning circuit is electrically connected with the measuring signal input end of the main control circuit;
the reference signal output end of the detector is electrically connected with the input end of the front-end reference signal conditioning circuit, the output end of the front-end reference signal conditioning circuit is electrically connected with the input end of the rear-end reference signal conditioning circuit, and the output end of the rear-end reference signal conditioning circuit is electrically connected with the reference signal input end of the main control circuit.
4. The embedded system non-dispersive infrared gas analysis circuit according to claim 3, wherein: the front-end measurement signal conditioning circuit comprises an operational amplifier U17, a resistor R709, a resistor R710, a capacitor C64, a resistor R711 and a capacitor C68, wherein the non-inverting input end of the operational amplifier U17 is electrically connected with the detection signal output end of the detector, the non-inverting input end of the operational amplifier U17 is grounded through the resistor R709, the resistor R710 and the capacitor C64 are sequentially connected in series between the inverting input end of the operational amplifier U17 and the ground, the resistor R711 and the capacitor C68 are connected in parallel between the inverting input end and the output end of the operational amplifier U17, and the output end of the operational amplifier U17 is electrically connected with the input end of the rear-end measurement signal conditioning circuit;
the front-end reference signal conditioning circuit comprises an operational amplifier U19, a resistor R713, a capacitor C70, a resistor R714, a resistor R713 and a capacitor C71, wherein a non-inverting input end of the operational amplifier U19 is electrically connected with a reference signal output end of the detector, a non-inverting input end of the operational amplifier U19 is grounded through the resistor R713, the resistor R714 and the capacitor C70 are sequentially connected between an inverting input end of the operational amplifier U19 and the ground in series, the resistor R715 and the capacitor C71 are connected between an inverting input end and an output end of the operational amplifier U19 in parallel, and an output end of the operational amplifier U19 is electrically connected with an input end of the rear-end reference signal conditioning circuit.
5. The embedded system non-dispersive infrared gas analysis circuit according to claim 3, wherein: the rear-end measurement signal conditioning circuit comprises a variable resistor R69, a resistor R71, a capacitor C72, a resistor R66, an operational amplifier U20A, a resistor R73, a capacitor C74, a resistor R67, an operational amplifier U21C, a capacitor C73, a Schottky diode D10, a resistor R68, a resistor R70, an operational amplifier U21 70 and a resistor R70, wherein the output end of the front-end measurement signal conditioning circuit is electrically connected with the non-inverting input end of the operational amplifier U20 70 through the capacitor C70, the non-inverting input end of the operational amplifier U20 70 is grounded through the resistor R70, the resistor R70 and the variable resistor R70 are sequentially connected in series between the inverting input end of the operational amplifier U20 70 and the ground, the resistor R70 and the capacitor C70 are connected in parallel between the inverting input end and the output end of the operational amplifier U20 70, the output end of the operational amplifier U20 70 is electrically connected with the non-inverting input end of the operational amplifier U70 through the resistor R70, the capacitor C73 is electrically connected between the inverting input end and the output end of the operational amplifier U21C, the inverting input end and the output end of the operational amplifier U21C are respectively and correspondingly electrically connected with the pin No. 1 and the pin No. 3 of the schottky diode D10, the pin No. 2 of the schottky diode D10 is grounded through the resistor R68, the pin No. 2 of the schottky diode D10 is electrically connected with the non-inverting input end of the operational amplifier U21D, the inverting input end of the operational amplifier U21D is electrically connected with the non-inverting input end of the operational amplifier U21C through the resistor R70, the resistor R72 is electrically connected between the inverting input end and the output end of the operational amplifier U21D, and the output end of the operational amplifier U21D is electrically connected with the measurement signal input end of the main control circuit;
the back-end reference signal conditioning circuit comprises a capacitor C75, a resistor R74, a variable resistor R77, a resistor R79, an operational amplifier U20B, a resistor R81, a capacitor C77, a resistor R75, an operational amplifier U21B, a capacitor C76, a Schottky diode D11, a resistor R76, a resistor R78, an operational amplifier U22 78 and a resistor R78, wherein the output end of the front-end reference signal conditioning circuit is electrically connected with the non-inverting input end of the operational amplifier U20 78 through the capacitor C78, the non-inverting input end of the operational amplifier U20 78 is grounded through the resistor R78, the resistor R78 and the variable resistor R78 are electrically connected between the inverting input end of the operational amplifier U20 78 and the ground in sequence, the resistor R78 and the capacitor C78 are connected between the inverting input end and the output end of the operational amplifier U20 78 in parallel, the output end of the operational amplifier U20 78 is electrically connected with the non-inverting input end of the operational amplifier U78 through the resistor R78, the capacitor C76 is electrically connected between the inverting input end and the output end of the operational amplifier U21B, the inverting input end and the output end of the operational amplifier U21B are respectively and correspondingly electrically connected with the pin 1 and the pin 3 of the schottky diode D11, the pin 2 of the schottky diode D11 is grounded through the resistor R76, the pin 2 of the schottky diode D11 is electrically connected with the non-inverting input end of the operational amplifier U22C, the inverting input end of the operational amplifier U22C is electrically connected with the non-inverting input end of the operational amplifier U21B through the resistor R78, the resistor R80 is electrically connected between the inverting input end and the output end of the operational amplifier U22C, and the output end of the operational amplifier U22C is electrically connected with the reference signal input end of the main control circuit.
6. The embedded system non-dispersive infrared-based gas analysis circuit according to claim 1, wherein: the light source frequency modulation circuit comprises a boosting chip U2, an inductor L1, a resistor R2, a resistor R3, a capacitor C2, a capacitor C5, a capacitor C6, a resistor R1 and a MOS tube Q1, wherein a power supply input end of the boosting chip U2 is electrically connected with a +5V output end of a power supply circuit, a power supply input end of the boosting chip U2 is grounded through the capacitor C6, two inductor connecting ends of the boosting chip U2 are respectively electrically connected with two ends of the inductor L1, a ground end of the boosting chip U2 is grounded, an output end of the boosting chip U2 is electrically connected with the power supply input end of the light source, an output end of the boosting chip U2 is grounded through the capacitor C2, the resistor R2 is electrically connected between the output end and a feedback input end of the boosting chip U2, a feedback input end of the boosting chip U2 is grounded through the resistor R3, an enabling end of the boosting chip U2 is grounded through the capacitor C5, the grid electrode of the MOS tube Q1 is electrically connected with the signal output end of the main control circuit, the source electrode of the MOS tube Q1 is grounded, and the drain electrode of the MOS tube Q1 is electrically connected with the control signal input end of the light source.
7. The embedded system non-dispersive infrared-based gas analysis circuit according to claim 1, wherein: the environment monitoring circuit comprises an air pressure monitoring circuit and a temperature monitoring circuit, and the output ends of the air pressure monitoring circuit and the temperature monitoring circuit are respectively electrically connected with the environment signal input end of the main control circuit.
8. The embedded system non-dispersive infrared gas analysis circuit according to any of the claims 1 to 7, wherein: the man-machine interaction circuit comprises a key and a display screen, and the key and the display screen are respectively electrically connected with the interaction port of the main control circuit.
9. The embedded system non-dispersive infrared gas analysis circuit according to any of the claims 1 to 7, wherein: the intelligent terminal also comprises a communication circuit, wherein the main control circuit is electrically connected with the communication circuit, and the communication circuit is electrically connected with an external receiving terminal.
10. An analysis method based on an embedded system non-dispersive infrared gas analysis circuit is characterized by comprising the following steps:
initializing an analysis circuit, detecting the target gas by a detection assembly in real time to obtain infrared light intensity information partially absorbed by the target gas, and sending the infrared light intensity information to a signal processing circuit;
the signal processing circuit performs signal processing on the infrared light intensity information and sends the infrared light intensity information to the main control circuit;
the environment monitoring assembly monitors environment information in real time and sends the environment information to the main control circuit;
the main control circuit calculates the concentration value of the target gas according to the infrared light intensity information after signal processing, and directly reads the environmental parameter value according to the environmental information;
and the main control circuit performs compensation processing on the concentration value of the target gas according to the environment parameter value, and respectively displays the concentration value and the environment parameter value after the compensation processing on a display screen.
The man-machine interaction circuit receives a light source frequency setting command, the main control circuit generates a driving signal according to the light source frequency setting command and sends the driving signal to the light source frequency modulation circuit, the light source frequency modulation circuit adjusts the light source frequency according to the driving signal, and the steps are repeated to obtain an analysis result of the concentration of the target gas.
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