CN212808028U - Photoacoustic spectrum oil gas monitoring unit - Google Patents
Photoacoustic spectrum oil gas monitoring unit Download PDFInfo
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- CN212808028U CN212808028U CN202020959231.6U CN202020959231U CN212808028U CN 212808028 U CN212808028 U CN 212808028U CN 202020959231 U CN202020959231 U CN 202020959231U CN 212808028 U CN212808028 U CN 212808028U
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Abstract
The utility model discloses a photoacoustic spectroscopy oil gas monitoring unit, include: the laser is internally provided with a temperature regulating semiconductor, and the photoacoustic cell body is provided with an air inlet; the acoustic sensor is used for detecting pressure waves generated in the photoacoustic cell and outputting an output signal of the acoustic sensor; the signal processing circuit is used for processing the signal output by the acoustic sensor; the central processing unit is used for analyzing signals, receiving signals and sending instructions, and is externally connected with a power supply circuit; the laser driving circuit is used for controlling the laser to generate laser with a specific wavelength; the utility model discloses laser wavelength of laser instrument transmission is easily controlled, can easily make it be periodic variation to can not make the spectrogram who obtains at last have the deviation, improved the detection precision, the signal that its acoustic sensor derived simultaneously has further improved the detection precision through multilevel processing, makes this acoustic spectrum oil gas monitoring unit not only sensitive, and the accuracy is higher.
Description
Technical Field
The utility model relates to a detect technical field, concretely relates to optoacoustic spectrum oil gas monitoring unit.
Background
The principle of the existing oil gas monitoring unit is that a substance is placed in a closed container, the substance is excited after absorbing light with a specific wavelength, the excited substance returns to an initial state and can pass through radiation transition or non-radiation transition, and heat is generated in the process; if the wavelength of the absorbed light changes periodically, the pressure fluctuation in the container is also periodic; since the frequency of the modulated light is typically in the audible range, this pressure fluctuation becomes an acoustic wave; then, an electric signal obtained by synchronously amplifying the acoustic wave signal sensed by the acoustic sensor is an optical signal, and if the optical signal is recorded as a function of the incident light frequency, an optical-acoustic spectrogram can be obtained; this technique is a technique for obtaining a corresponding spectrogram by using the property of light absorption of a substance, and the obtained spectrogram can be used to confirm the components contained in the substance, and is a method which has high sensitivity and can efficiently detect a sample without any pretreatment.
Especially in the oil gas monitoring unit, adopt the optoacoustic spectroscopy detection technique most extensively, in the current optoacoustic spectroscopy oil gas monitoring unit, generally adopt the laser instrument as the light source, regard as the sound sensing element with the microphone, the wavelength of the light that the laser instrument emitted as the light source among the prior art is unstable inadequately, it is periodic change to be difficult to control the laser that the laser instrument emitted, thereby can make the spectrogram who obtains at last have the deviation, influenced the detection precision, the signal processing effect that its sound sensing element derived is not good simultaneously, also can influence the precision that detects, thereby lead to the oil gas monitoring unit to monitor sensitively inadequately, the degree of accuracy is relatively poor.
Disclosure of Invention
The utility model discloses there is the laser that hardly controls the laser instrument transmission among the optoacoustic spectrum oil gas monitoring unit to prior art and is the not good technical problem of signal processing effect that periodic variation and acoustic sensor derive, the utility model provides a.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a photoacoustic spectroscopy hydrocarbon monitoring unit comprising:
the photoacoustic cell is hollow, a laser is arranged inside the photoacoustic cell, a temperature adjusting semiconductor is arranged in the laser, and an air inlet is formed in the photoacoustic cell body;
the acoustic sensor is used for detecting pressure waves generated in the photoacoustic cell and outputting an output signal of the acoustic sensor, and the input end of the acoustic sensor is connected with the photoacoustic cell;
the signal processing circuit is used for processing the signal output by the acoustic sensor, and the input end of the signal processing circuit is connected with the output end of the acoustic sensor;
the central processing unit is used for analyzing signals, receiving signals and sending instructions, the input end of the central processing unit is connected with the output end of the signal processing circuit, and the central processing unit is externally connected with a power supply circuit; and
and the laser driving circuit is used for controlling the laser to generate laser with a specific wavelength, the input end of the laser driving circuit is connected with the central processing unit, and the output end of the laser driving circuit is connected with the laser.
Further, the signal processing circuit includes:
the primary amplifying circuit is used for amplifying the analog quantity output by the sound-sensitive element and is connected with the output end of the sound-sensitive element;
the band-pass filter circuit is used for filtering the signal output by the primary amplifying circuit, and the input end of the band-pass filter circuit is connected with the output end of the band-pass filter circuit;
a second-stage amplification circuit for amplifying the output signal of the band-pass filter circuit, the input terminal of the second-stage amplification circuit being connected with the output terminal of the band-pass filter circuit, and
and the A/D conversion circuit is used for converting the analog quantity input by the secondary amplifying circuit into digital quantity, the input end of the A/D conversion circuit is connected with the output end of the secondary amplifying circuit, and the output end of the A/D conversion circuit is connected with the central processing unit.
Further, the laser driving circuit includes:
the current driving circuit is used for adjusting the current in the laser, the input end of the current driving circuit is connected with the central processing unit, and the output end of the current driving circuit is connected with the laser; and
and the temperature adjusting circuit is used for adjusting the temperature of a temperature adjusting semiconductor in the laser, the input end of the temperature adjusting circuit is connected with the central processing unit, and the output end of the temperature adjusting circuit is connected with the laser.
Further, the power supply circuit includes:
an interface circuit for introducing an external current;
the primary voltage divider is used for primary voltage division to obtain an independent voltage, and the input end of the primary voltage divider is connected with the output end of the interface circuit;
the secondary voltage divider is used for secondary voltage division to obtain an independent voltage, and the input end of the secondary voltage divider is connected with the primary voltage dividing circuit;
furthermore, the current driving circuit comprises a current setting module and a current adjusting module, the current setting module is used for introducing rated current, the input end of the current setting module is connected with the central processing unit, the output end of the current adjusting module is connected with the input end of the current adjusting module, the current adjusting module is used for adjusting the input current of the laser, and the output end of the current adjusting module is connected with the laser.
Further, the temperature adjustment circuit includes:
the voltage control circuit is used for giving an input voltage of the temperature regulating circuit as a reference voltage, and the input end of the voltage control circuit is connected with the central processing unit;
the voltage stabilizing module is used for stabilizing the output voltage of the voltage control circuit, and the input end of the voltage stabilizing module is connected with the output end of the voltage control circuit;
the voltage comparator is used for comparing the internal voltage of the laser with the voltage value of the reference voltage given by the output end of the voltage control circuit; and
and the MCU module is used for analyzing the output signal of the voltage comparator and correspondingly controlling the temperature adjusting semiconductor in the laser, the input end of the MCU module is connected with the output end of the voltage comparator, and the output end of the MCU module is connected with the laser.
Furthermore, the number of the primary voltage dividers and the number of the secondary voltage dividers are respectively provided with a plurality of voltage dividers.
Has the advantages that: the utility model discloses a laser drive circuit control laser instrument, because the laser wavelength of laser instrument transmission receives the influence of temperature and electric current, we control the semiconductor that adjusts the temperature of laser instrument inside through laser drive circuit for it adjusts the temperature the semiconductor and maintains at specific temperature, then gives a specific periodic variation's electric current for the laser instrument through laser drive circuit, and accurate control just so can make the laser wavelength of laser instrument transmitter laser also become periodic variation, thereby has improved the precision of detecting element; secondly the utility model discloses the signal with acoustic sensor output is once enlargied through signal processing circuit, is exported through enlargiing again after filtering and analog-to-digital conversion to obtain accurate optoacoustic spectrogram, thereby further improved this detecting element's precision, make this acoustooptic spectrum oil gas monitoring unit not only sensitive, and the accuracy is higher.
Drawings
Fig. 1 is an overall module schematic diagram of a photoacoustic spectroscopy oil gas monitoring unit according to the present invention;
fig. 2 is a schematic block diagram of a signal processing circuit of a photoacoustic spectroscopy oil gas monitoring unit according to the present invention;
fig. 3 is a schematic block diagram of a laser driving circuit of a photoacoustic spectroscopy oil gas monitoring unit according to the present invention;
fig. 4 is a schematic diagram of a temperature adjusting circuit module of the photoacoustic spectroscopy oil gas monitoring unit according to the present invention;
fig. 5 is a schematic diagram of a current driving circuit module of the photoacoustic spectroscopy oil-gas monitoring unit according to the present invention;
fig. 6 is a schematic circuit diagram of a signal processing circuit of the photoacoustic spectroscopy oil-gas monitoring unit according to the present invention;
fig. 7 is a schematic circuit diagram of a laser driving circuit of a photoacoustic spectroscopy oil gas monitoring unit according to the present invention;
fig. 8 is a schematic circuit diagram of a temperature regulating circuit of the photoacoustic spectroscopy oil gas monitoring unit according to the present invention;
fig. 9 is a schematic circuit diagram of a power circuit of the photoacoustic spectroscopy oil gas monitoring unit according to the present invention;
fig. 10 is a schematic circuit diagram of a current driving circuit of a photoacoustic spectroscopy oil gas monitoring unit according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. a photoacoustic cell; 2. a laser; 3. an air inlet; 4. a sound sensitive element; 5. a signal processing circuit; 6. a central processing unit; 7. a laser driving circuit; 8. a first-stage amplifying circuit; 9. a band-pass filter circuit; 10. an A/D conversion circuit; 11. a secondary amplifying circuit; 12. a current drive circuit; 13. a temperature adjusting circuit; 14. a power supply circuit; 15. an interface circuit; 16. a primary voltage divider; 17. a secondary voltage divider; 18. a current setting module; 19. a current regulation module; 20. a voltage control circuit; 21. a voltage stabilization module; 22. a voltage comparator; 23. and the MCU module.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
A photoacoustic spectroscopy hydrocarbon monitoring unit as shown in fig. 1, comprising:
the photoacoustic cell 1 is hollow, a closed space is provided during photoacoustic spectroscopy oil-gas monitoring, a laser 2 is arranged in the photoacoustic cell 1 and used for emitting laser with a specific wavelength, a temperature adjusting semiconductor is arranged in the laser 2, the temperature of the laser 2 is kept unchanged by setting the temperature of the temperature adjusting semiconductor, so that the wavelength of the laser emitted by the laser 2 can be changed along with the change of current, the wavelength of the laser emitted by the laser 2 can be controlled only by controlling the current of the laser 2, and an air inlet 3 is formed in the body of the photoacoustic cell 1 and used for introducing oil-gas substances to be detected;
the input end of the acoustic sensing element 4 is connected with the photoacoustic cell, and the acoustic sensing element 4 is used for detecting pressure waves generated in the photoacoustic cell 1, converting the received pressure waves in the photoacoustic cell 1 into analog quantity and outputting the analog quantity;
the input end of the signal processing circuit 5 is connected with the output end of the acoustic sensor 4 and is used for processing the received output signal of the acoustic sensor 4, carrying out primary amplification and filtering on the output signal, carrying out analog-to-digital conversion on the output signal into a digital signal and finally outputting the digital signal;
the central processing unit 6 is used for analyzing signals, receiving signals and sending instructions, the input end of the central processing unit 6 is connected with the output end of the signal processing circuit 5 and used for receiving the output signals of the signal processing circuit 5, the obtained analog quantity is analyzed and displayed in a spectrum mode, and the central processing unit 6 is externally connected with a power supply circuit 14; and
As shown in fig. 2 or fig. 6, the signal processing circuit 5 includes:
the primary amplifying circuit 8, the primary amplifying circuit 8 is connected with the output end of the acoustic sensor 4 and is used for amplifying the analog quantity output by the acoustic sensor 4, and the analog quantity obtained by the acoustic sensor 4 is weak, so that the signal can be further processed conveniently after amplification;
the input end of the band-pass filter circuit 9 is connected with the output end of the primary amplifying circuit 8, and the band-pass filter circuit 9 is used for filtering signals output by the primary amplifying circuit 8 and aims to filter useless high-frequency and low-frequency signals and extract useful intermediate-frequency signals;
the input end of the second-stage amplifying circuit 11 is connected with the output end of the band-pass filter circuit 9, and the output signal of the band-pass filter circuit 9 is amplified and transmitted to the A/D conversion circuit 10, which is equivalent to a quadratic large signal, so that the purpose is to enable the signal obtained by the A/D conversion circuit 10 to be more accurate and more convenient to convert; and
the A/D conversion circuit 10, the input end of the A/D conversion circuit 10 is connected with the output end of the second-stage amplifying circuit 11, and is used for converting the analog quantity output by the second-stage amplifying circuit 11 into digital quantity, namely a process of changing discrete quantity into continuous quantity, and transmitting the obtained digital quantity to the central processing unit.
As shown in fig. 3 or fig. 7, the laser driving circuit includes two parts, which are a current driving circuit 12 part and a temperature adjusting circuit 13 part, respectively, and the two parts are defined in terms of work, the current driving circuit 12 is used for adjusting the current inside the laser 2, the input end of the current driving circuit 12 is connected to the central processing unit 6, the output end is connected to the laser 2, the temperature adjusting circuit 13 is used for adjusting the temperature of the temperature adjusting semiconductor inside the laser 2, the input end is connected to the central processing unit 6, and the output end is connected to the laser 2.
As shown in fig. 9, the power supply circuit 14 includes:
an interface circuit 15 for introducing an external current;
the primary voltage divider 16 is used for primary voltage division to obtain an independent voltage, and the input end of the primary voltage divider 16 is connected with the output end of the interface circuit 15;
the secondary voltage divider 17 is used for secondary voltage division to obtain an independent voltage, and the input end of the secondary voltage divider 17 is connected with the primary voltage divider 16;
the primary voltage divider 16 can be directly connected with an external load, or connected with a load after being connected with the secondary voltage divider 17 in series, so that a plurality of power supplies with different voltages can be obtained for multiple uses, and meanwhile, the multiple power supplies are converted into a whole.
As shown in fig. 5 or fig. 10, the current driving circuit 12 includes a current setting module 18 and a current adjusting module 19, the current setting module 18 is used for introducing a rated current, an input terminal of the current setting module 18 is connected to the cpu 6, that is, power is supplied through the cpu 6, an output terminal of the current adjusting module 19 is connected to an input terminal of the current adjusting module 19, the current adjusting module 19 is used for adjusting the input current of the laser 2, and an output terminal of the current adjusting module 19 is connected to the laser.
The temperature adjusting circuit 13 shown in fig. 4 or 8 includes: the temperature control circuit comprises a voltage control circuit 20, a voltage stabilizing module 21, a voltage comparator 22 and an MCU module 23, wherein the voltage control circuit 20 is used for giving the input voltage of one temperature adjusting circuit 13 as a reference voltage, and the input end of the voltage control circuit 20 is connected with the central processing unit 6; the voltage stabilizing module 21 is used for stabilizing the output voltage of the voltage control circuit 20, and the input end of the voltage stabilizing module 21 is connected with the output end of the voltage control circuit 20; the voltage comparator 22 is used for comparing the internal voltage of the laser 2 with the voltage value of the reference voltage given by the output end of the voltage control circuit 20; the MCU module 23 is used for analyzing the output signal of the voltage comparator 22 and correspondingly controlling the temperature adjusting semiconductor in the laser 2, the input end of the MCU module 23 is connected with the output end of the voltage comparator 22, and the output end of the MCU module is connected with the laser.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. A photoacoustic spectroscopy oil and gas monitoring unit, comprising:
the photoacoustic cell (1) is hollow, a laser (2) is arranged in the photoacoustic cell (1), a temperature adjusting semiconductor is arranged in the laser (2), and an air inlet (3) is formed in the body of the photoacoustic cell (1);
the acoustic sensing element (4) is used for detecting pressure waves generated in the photoacoustic cell and outputting an output signal of the acoustic sensing element (4), and the input end of the acoustic sensing element (4) is connected with the photoacoustic cell;
the signal processing circuit (5) is used for processing the signal output by the acoustic sensor (4), and the input end of the signal processing circuit (5) is connected with the output end of the acoustic sensor (4);
the central processing unit (6) is used for analyzing signals, receiving signals and sending instructions, the input end of the central processing unit (6) is connected with the output end of the signal processing circuit (5), and the central processing unit (6) is externally connected with a power supply circuit (14); and
the laser driving circuit (7) is used for controlling the laser (2) to generate laser with a specific wavelength, the input end of the laser driving circuit (7) is connected with the central processing unit (6), and the output end of the laser driving circuit is connected with the laser (2).
2. A photoacoustic spectroscopic oil and gas monitoring unit as set forth in claim 1, characterized in that said signal processing circuit (5) comprises:
the primary amplification circuit (8) is used for amplifying the analog quantity output by the sound-sensitive element (4), and the primary amplification circuit (8) is connected with the output end of the sound-sensitive element (4);
the band-pass filter circuit (9) is used for filtering the signal output by the primary amplification circuit (8), and the input end of the band-pass filter circuit (9) is connected with the output end of the primary amplification circuit (8);
a secondary amplification circuit (11), the secondary amplification circuit (11) amplifying the output signal of the band-pass filter circuit (9), the input end of the secondary amplification circuit (11) being connected with the output end of the band-pass filter circuit (9), and
the A/D conversion circuit (10) is used for converting analog quantity input by the secondary amplification circuit (11) into digital quantity, the input end of the A/D conversion circuit (10) is connected with the output end of the secondary amplification circuit (11), and the output end of the A/D conversion circuit is connected with the central processing unit (6).
3. The photoacoustic spectroscopy hydrocarbon monitoring unit of claim 1, wherein the laser driver circuit comprises:
the current driving circuit (12) is used for adjusting the current inside the laser (2), the input end of the current driving circuit (12) is connected with the central processing unit (6), and the output end of the current driving circuit is connected with the laser (2); and
and the temperature adjusting circuit (13) is used for adjusting the temperature of the temperature adjusting semiconductor in the laser (2), the input end of the temperature adjusting circuit is connected with the central processing unit (6), and the output end of the temperature adjusting circuit is connected with the laser (2).
4. A photoacoustic spectroscopy oil and gas monitoring unit according to claim 1, wherein said power supply circuit (14) comprises:
an interface circuit (15) for introducing an external current;
the primary voltage divider (16) is used for primary voltage division to obtain an independent voltage, and the input end of the primary voltage divider (16) is connected with the output end of the interface circuit (15);
and the secondary voltage divider (17) is used for secondary voltage division to obtain an independent voltage, and the input end of the secondary voltage divider (17) is connected with the primary voltage divider (16).
5. A photoacoustic spectroscopy oil-gas monitoring unit according to claim 3, wherein the current driving circuit (12) comprises a current setting module (18) and a current adjusting module (19), the current setting module (18) is used for introducing rated current, the input end of the current setting module is connected with the central processing unit (6), the output end of the current adjusting module (19) is connected with the input end of the current adjusting module (19), the current adjusting module (19) is used for adjusting the input current of the laser (2), and the output end of the current adjusting module (19) is connected with the laser.
6. A photoacoustic spectroscopic oil and gas monitoring unit as set forth in claim 3, characterized in that the tempering circuit (13) comprises:
a voltage control circuit (20) for giving an input voltage of one of the temperature adjusting circuits (13) as a reference voltage, an input terminal of the voltage control circuit (20) being connected to the central processing unit (6);
the voltage stabilizing module (21) is used for stabilizing the output voltage of the voltage control circuit (20), and the input end of the voltage stabilizing module (21) is connected with the output end of the voltage control circuit (20);
a voltage comparator (22) for comparing the voltage inside the laser (2) with a voltage value of a reference voltage given at the output of the voltage control circuit (20); and
the MCU module (23) is used for analyzing the output signal of the voltage comparator (22) and correspondingly controlling the temperature adjusting semiconductor in the laser (2), the input end of the MCU module (23) is connected with the output end of the voltage comparator (22), and the output end of the MCU module is connected with the laser.
7. A photoacoustic spectroscopy oil-gas monitoring unit according to claim 4, wherein there are a plurality of the primary voltage dividers (16) and the secondary voltage dividers (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020959231.6U CN212808028U (en) | 2020-05-29 | 2020-05-29 | Photoacoustic spectrum oil gas monitoring unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020959231.6U CN212808028U (en) | 2020-05-29 | 2020-05-29 | Photoacoustic spectrum oil gas monitoring unit |
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| CN212808028U true CN212808028U (en) | 2021-03-26 |
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| CN202020959231.6U Active CN212808028U (en) | 2020-05-29 | 2020-05-29 | Photoacoustic spectrum oil gas monitoring unit |
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