CN202533368U - Three-channel infrared gas sensor for high-precision detection of carbon oxide (CO) gas - Google Patents
Three-channel infrared gas sensor for high-precision detection of carbon oxide (CO) gas Download PDFInfo
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- CN202533368U CN202533368U CN 201220147287 CN201220147287U CN202533368U CN 202533368 U CN202533368 U CN 202533368U CN 201220147287 CN201220147287 CN 201220147287 CN 201220147287 U CN201220147287 U CN 201220147287U CN 202533368 U CN202533368 U CN 202533368U
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Abstract
The utility model provides a three-channel infrared gas sensor for the high-precision detection of carbon oxide (CO) gas. The three-channel infrared gas sensor comprises a micro control unit (MCU) control module, a measurement gas chamber, an infrared light source module, a three-channel infrared gas detector, a signal processing circuit module, a signal output circuit module and a power supply circuit module, wherein the infrared light source module and the three-channel infrared gas detector are respectively arranged at two ends of the measurement gas chamber; the MCU control module is connected with the infrared light source module; the three-channel infrared gas detector is connected with the signal processing circuit module and the MCU control module in sequence; the MCU control module is connected with the signal output circuit module so that signals computed and processed by the MCU control module are output through the signal output circuit module; and the power supply circuit module is connected with the infrared light source module, the three-channel infrared gas detector, the signal processing circuit module and the MCU control module to provide a power supply voltage. The three-channel infrared gas sensor has the advantages of scientific design, high measurement precision and long service life.
Description
Technical field
The utility model relates to a kind of infrared gas sensor, specifically, has related to a kind of triple channel infrared gas sensor of the CO of being used for gas high Precision Detection.
Background technology
As everyone knows; CO is the toxic gas of colorless and odorless; In industries such as chemical plant, mine, smelting iron and steel; Tend to produce a large amount of CO, and also contain a large amount of CO in the used natural gas of daily life, therefore detect CO safeguarding industrial safety production, prevention and poison and ensureing that life security has very significant meaning.In traditional CO pick-up unit mature technology; Mainly be to adopt catalysis or electrochemical sensor; And this type of sensor exists shortcoming such as be prone to poison, accuracy of detection is low, serviceable life is short, and therefore, the infrared CO gas sensor detection technique with good development prospect has received insider's generally attention; But, CO
2Particularly the measurement influence of low concentration is bigger to the measurement of infrared CO gas sensor for gas, in order to eliminate CO
2Interference, normally add filtration unit, the CO in the elimination CO gas to be measured in gas circuit the place ahead
2Gas, but the effect of this method is not fine, but also need periodic replacement medium, very inconvenience.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The purpose of the utility model is the deficiency to prior art, thereby the triple channel infrared gas sensor that is used for CO gas high Precision Detection of a kind of design science, measuring accuracy height, long service life is provided.
To achieve these goals; The technical scheme that the utility model adopted is: a kind of triple channel infrared gas sensor of the CO of being used for gas high Precision Detection, and it comprises the MCU control module, measure air chamber, be separately positioned on infrared light supply module and triple channel infrared gas detector, signal processing circuit module, signal output apparatus module and the power circuit module at said measurement air chamber two ends; Wherein, Said infrared light supply module comprises the broadband infrared light source, said triple channel infrared gas detector comprise three wavelength be respectively the optical filter of 4.0 μ m, 4.26 μ m, 4.6 μ m, with wavelength be 4.0 μ m optical filter corresponding reference passage, with wavelength be the corresponding CO of optical filter of 4.26 μ m
2Passage and be the corresponding CO passage of optical filter of 4.6 μ m with wavelength, the corresponding setting of three optical filters of the broadband infrared light source of said infrared light supply module and said triple channel infrared gas detector; Said MCU control module connects said infrared light supply module is launched three kinds of wavelength to said measurement air chamber with the broadband infrared light source of controlling said infrared light supply module IR; Said triple channel infrared gas detector connects said signal processing circuit module and said MCU control module successively so that with said reference channel, said CO
2Three output signals of passage and the collection of said CO passage are transferred to said MCU control module through after the said signal processing circuit resume module; Said MCU control module connects said signal output apparatus module so that through the signal output of said signal output apparatus module after with said MCU control module calculation process; Said power circuit module connects said infrared light supply module, said triple channel infrared gas detector, said signal processing circuit module and said MCU control module respectively so that supply voltage to be provided.
Based on above-mentioned; It also comprises temperature compensation module; Said MCU control module connects said temperature compensation module so that carry out compensation data according to the sensor actual work temperature of said temperature compensation module collection, and said power circuit module connects said temperature compensation module so that supply voltage to be provided.
Based on above-mentioned; Said temperature compensation module comprises temperature voltage converter U4, operational amplifier U3 and resistance R 31; The voltage output end of said temperature voltage converter U4 connects the in-phase input end of said operational amplifier U3; The in-phase input end of the said operational amplifier U3 of one termination of said resistance R 31, another termination power of said resistance R 31, the inverting input of said operational amplifier U3 connects the output terminal of said operational amplifier U3; The output terminal of said operational amplifier U3 is as the output terminal of said temperature compensation module, and the temperature sense end of said temperature voltage converter U4 is as the temperature input end of said temperature compensation module.
Based on above-mentioned; Said infrared light supply module comprises permanent power integrated circuit chip U5, operational amplifier U6, little constant-current circuit, triode Q1 and Q2, resistance R 11-R19, diode D1 and broadband infrared light source; Said little constant-current circuit comprises triode Q3, triode Q4, triode Q5, resistance R 110 and resistance R 111; The two ends of said resistance R 110 connect base stage and the collector of said triode Q3; The collector of said triode Q3 connects power supply, and the base stage of said triode Q4 connects the emitter of said triode Q3, and the collector of said triode Q4 connects the collector of said triode Q3; The emitter of said triode Q4 connects the base stage of said triode Q5; The two ends of said resistance R 111 connect base stage and the emitter of said triode Q5, and the collector of said triode Q5 connects the base stage of said triode Q3, and the emitter of said triode Q5 is as the output terminal of said little constant-current circuit; The power output pin Pout of said permanent power integrated circuit chip U5 connects the inverting input of said operational amplifier U6; The in-phase input end of said operational amplifier U6 connects power supply through said resistance R 13; One end of said resistance R 14 connects the in-phase input end of said operational amplifier U6; The other end ground connection of said resistance R 14, an end of the said resistance R 15 of output termination of said operational amplifier U6, the base stage of the said triode Q1 of another termination of said resistance R 15; The base stage of said triode Q1 connects the anode of said diode D1; The negative electrode of said diode D1 connects the collector of said triode Q2 through said resistance R 19; The base stage of said triode Q2 connects an end of said resistance R 18; The other end of said resistance R 18 connects said MCU control module, the grounded emitter of said triode Q2 as the input end of said infrared light supply module; The collector of said triode Q1 connects an end of said resistance R 12; The end of the other end connecting resistance R11 of said resistance R 12; The output terminal of the said little constant-current circuit of another termination of said resistance R 11; The power of said permanent power integrated circuit chip U5 is controlled the end that positive pin RS+ connects said resistance R 11; The negative pin RS-of power control of said permanent power integrated circuit chip U5 connects the other end of said resistance R 11, the logic voltage pin LE of said permanent power integrated circuit chip U5 and inhibition voltage pin INHIBIT ground connection; The emitter of said triode Q1 connects an end of said broadband infrared light source; The other end ground connection of said broadband infrared light source; One end of the said broadband infrared light source of one termination of said resistance R 16; One end of the said resistance R 17 of another termination of said resistance R 16, the other end of the said broadband infrared light source of another termination of said resistance R 17, an end of said resistance R 17 connect the voltage input pin Vin of said permanent power integrated circuit chip U5.
Based on above-mentioned, said signal processing circuit module comprises three road signal amplification circuits, filtering circuit and A/D change-over circuit, and said signal amplification circuit comprises two operational amplifiers, traffic filter, six resistance, four electric capacity; The inverting input of said first operational amplifier of one termination of said first resistance; Another termination reference data voltage of said first resistance; The two ends of said second resistance and said first electric capacity are connected in parallel on the inverting input and the output terminal of said first operational amplifier; The in-phase input end of said first operational amplifier connects an end of said the 3rd electric capacity; Another termination reference data voltage of said the 3rd electric capacity, the in-phase input end of said first operational amplifier of a termination of said the 5th resistance, the other end of said the 5th resistance connects the signal output part of said triple channel infrared gas detector as the input end of said signal amplification circuit; The inverting input of said second operational amplifier of one termination of said the 3rd resistance; Another termination reference data voltage of said the 3rd resistance; The two ends of said the 4th resistance and said second electric capacity are connected in parallel on the inverting input and the output terminal of said second operational amplifier; The in-phase input end of said second operational amplifier connects an end of said the 6th resistance; Another termination reference data voltage of said the 6th resistance, the in-phase input end of said first operational amplifier of a termination of said the 4th electric capacity; The input end of the said traffic filter of output termination of said first operational amplifier; The output terminal of the said traffic filter of another termination of said the 4th electric capacity; Said traffic filter connects reference data voltage, and the output terminal of said second operational amplifier is as the output terminal of said signal amplification circuit.
The relative prior art of the utility model has substantive distinguishing features and progress, and specifically, in the utility model, the triple channel infrared gas detector is to MCU control module output reference channel, CO
2Three output signals that passage and CO passage are gathered, the MCU control module is through handling the concentration that the output signal can draw CO; Through temperature compensation module is set, eliminated the influence of environment temperature to the sensor degree of accuracy; It has the advantage of design science, measuring accuracy height, long service life.
Description of drawings
Fig. 1 is the circuit structure block diagram of the utility model.
Fig. 2 is the circuit theory diagrams of infrared light supply module.
Fig. 3 is the circuit theory diagrams of signal amplification circuit.
Fig. 4 is the circuit theory diagrams of temperature compensation module.
Embodiment
Through embodiment, the technical scheme of the utility model is done further detailed description below.
As shown in Figure 1; A kind of triple channel infrared gas sensor that is used for CO gas high Precision Detection, it comprises the MCU control module, measure air chamber, be separately positioned on infrared light supply module and triple channel infrared gas detector, signal processing circuit module, signal output apparatus module and the power circuit module at said measurement air chamber two ends.
Wherein, Said infrared light supply module comprises the broadband infrared light source, said triple channel infrared gas detector comprise three wavelength be respectively the optical filter of 4.0 μ m, 4.26 μ m, 4.6 μ m, with wavelength be 4.0 μ m optical filter corresponding reference passage, with wavelength be the corresponding CO of optical filter of 4.26 μ m
2Passage and be the corresponding CO passage of optical filter of 4.6 μ m with wavelength, the corresponding setting of three optical filters of the broadband infrared light source of said infrared light supply module and said triple channel infrared gas detector; Said MCU control module connects said infrared light supply module is launched three kinds of wavelength to said measurement air chamber with the broadband infrared light source of controlling said infrared light supply module IR; Said triple channel infrared gas detector connects said signal processing circuit module and said MCU control module successively so that with said reference channel, said CO
2Three output signals of passage and the collection of said CO passage are transferred to said MCU control module through after the said signal processing circuit resume module; Said MCU control module connects said signal output apparatus module so that through the signal output of said signal output apparatus module after with said MCU control module calculation process; Said power circuit module connects said infrared light supply module, said triple channel infrared gas detector, said signal processing circuit module and said MCU control module respectively so that supply voltage to be provided.
CO through said triple channel infrared gas detector
2The setting of passage and CO passage has solved Conventional detectors CO must be set
2The problem of filtration unit can not only be eliminated CO
2Influence, can also measure CO simultaneously
2Concentration with CO.
As shown in Figure 2; Said infrared light supply module comprises permanent power integrated circuit chip U5, operational amplifier U6, little constant-current circuit, triode Q1 and Q2, resistance R 11-R19, diode D1 and broadband infrared light source; Said little constant-current circuit comprises triode Q3, triode Q4, triode Q5, resistance R 110 and resistance R 111; The two ends of said resistance R 110 connect base stage and the collector of said triode Q3; The collector of said triode Q3 connects power supply, and the base stage of said triode Q4 connects the emitter of said triode Q3, and the collector of said triode Q4 connects the collector of said triode Q3; The emitter of said triode Q4 connects the base stage of said triode Q5; The two ends of said resistance R 111 connect base stage and the emitter of said triode Q5, and the collector of said triode Q5 connects the base stage of said triode Q3, and the emitter of said triode Q5 is as the output terminal of said little constant-current circuit; The power output pin Pout of said permanent power integrated circuit chip U5 connects the inverting input of said operational amplifier U6; The in-phase input end of said operational amplifier U6 connects power supply through said resistance R 13; One end of said resistance R 14 connects the in-phase input end of said operational amplifier U6; The other end ground connection of said resistance R 14, an end of the said resistance R 15 of output termination of said operational amplifier U6, the base stage of the said triode Q1 of another termination of said resistance R 15; The base stage of said triode Q1 connects the anode of said diode D1; The negative electrode of said diode D1 connects the collector of said triode Q2 through said resistance R 19; The base stage of said triode Q2 connects an end of said resistance R 18; The other end of said resistance R 18 connects said MCU control module, the grounded emitter of said triode Q2 as the input end of said infrared light supply module; The collector of said triode Q1 connects an end of said resistance R 12; The end of the other end connecting resistance R11 of said resistance R 12; The output terminal of the said little constant-current circuit of another termination of said resistance R 11; The power of said permanent power integrated circuit chip U5 is controlled the end that positive pin RS+ connects said resistance R 11; The negative pin RS-of power control of said permanent power integrated circuit chip U5 connects the other end of said resistance R 11, the logic voltage pin LE of said permanent power integrated circuit chip U5 and inhibition voltage pin INHIBIT ground connection; The emitter of said triode Q1 connects an end of said broadband infrared light source; The other end ground connection of said broadband infrared light source; One end of the said broadband infrared light source of one termination of said resistance R 16; One end of the said resistance R 17 of another termination of said resistance R 16, the other end of the said broadband infrared light source of another termination of said resistance R 17, an end of said resistance R 17 connect the voltage input pin Vin of said permanent power integrated circuit chip U5.The utilization of permanent power integrated circuit chip U5 and little constant-current circuit has improved the stability and the accuracy of circuit, and under the control of said MCU control module, said broadband infrared light source is launched broadband infrared light with stable power to said measurement air chamber.
As shown in Figure 3; Said signal processing circuit module comprises three road signal amplification circuit S1, S2 and R; Filtering circuit and A/D change-over circuit, wherein said signal amplification circuit branch road S1 comprises two operational amplifier U1, U2, traffic filter N1; Six resistance (R21-R26), four electric capacity (C1-C4); The inverting input of the said operational amplifier U1 of one termination of said resistance R 21, another termination 2V reference data voltage of said resistance R 21, the two ends of said resistance R 22 and said capacitor C 1 are connected in parallel on inverting input and the output terminal of said operational amplifier U1; The in-phase input end of said operational amplifier U1 connects an end of said capacitor C 3; Another termination 2V reference data voltage of said capacitor C 3; The in-phase input end of the said operational amplifier U1 of one termination of said resistance R 25, the other end of said resistance R 25 connects the signal output part of said triple channel infrared gas detector as the input end of said signal amplification circuit S1; The inverting input of the said operational amplifier U2 of one termination of said resistance R 23, another termination 2V reference data voltage of said resistance R 23, the two ends of said resistance R 24 and said capacitor C 2 are connected in parallel on inverting input and the output terminal of said operational amplifier U2; The in-phase input end of said operational amplifier U2 connects an end of said resistance R 26, another termination 2V reference data voltage of said resistance R 26, the in-phase input end of the said operational amplifier U2 of a termination of said capacitor C 4.
Said operational amplifier U1 carries out the first order of signal and amplifies; The input end of its said traffic filter N1 of output termination; The output terminal of the said traffic filter N1 of another termination of said capacitor C 4; Make through the filtered signal of said traffic filter N1 and under the effect of said operational amplifier U2, carry out second level amplification, to guarantee the enlargement factor of signal; Said traffic filter N1 connects reference data voltage, and the output terminal of said operational amplifier U2 is as the output terminal of said signal amplification circuit S1.Said signal amplification circuit S1, S2 and R are respectively said CO
2The amplifying circuit of three output signals that passage, said CO passage and said reference channel are gathered.
In order further to optimize this triple channel infrared gas sensor; Eliminate the influence of temperature to sensor; This sensor can also be provided with temperature compensation module, and is as shown in Figure 4, and said temperature compensation module comprises temperature voltage converter U4, operational amplifier U3 and resistance R 31; The voltage output end of said temperature voltage converter U4 connects the in-phase input end of said operational amplifier U3; The in-phase input end of the said operational amplifier U3 of one termination of said resistance R 31, another termination power of said resistance R 31, the inverting input of said operational amplifier U3 connects the output terminal of said operational amplifier U3; The output terminal of said operational amplifier U3 is as the output terminal of said temperature compensation module, and the temperature sense end of said temperature voltage converter U4 is as the temperature input end of said temperature compensation module.
Said MCU control module connects the output terminal of said temperature compensation module so that carry out compensation data according to the sensor actual work temperature of said temperature compensation module collection, and said power circuit module connects said temperature compensation module so that supply voltage to be provided.
In order to make the more stable operation of circuit, can add filter capacitor in each power supply input place, prevent of the influence of extraneous undesired signal to the stability of circuit.
When specifically using this triple channel infrared gas sensor, said infrared light supply module is sent the wideband pulse infrared light, three output of said triple channel infrared gas detector output signals: the reference channel output signal at 4.0 μ m absorption peak places
, 4.26 μ m absorption peak places CO
2Passage output signal
CO passage output signal with 4.6 μ m absorption peak places
, three output signals have following relation:
1-1
Wherein,
The intensity of light source of representing 4.0 μ m places,
The light source intensity of representing 4.26 μ m places,
The light source intensity of representing 4.6 μ m places,
Represent the responsiveness of triple channel infrared gas detector at 4.0 μ m places,
Represent the responsiveness of triple channel infrared gas detector at 4.26 μ m places,
Represent the responsiveness of triple channel infrared gas detector at 4.6 μ m places,
The transmittance of air chamber is measured in expression,
Expression CO
2Gas is in the transmittance at 4.26 μ m places,
Expression CO
2Gas is in the transmittance at 4.6 μ m places,
Expression CO gas is in the transmittance at 4.6 μ m places.
By concerning that 1-1 gets
By Bill's Lambert law
Can know that the concentration of gas and the transmittance of gas have relation one to one under the absorption coefficient situation consistent with absorption thickness, therefore, three output signals of said triple channel infrared gas detector: the reference channel output signal at 4.0 μ m absorption peak places
, 4.26 μ m absorption peak places CO
2Passage output signal
CO passage output signal with 4.6 μ m absorption peak places
Between ratio relation and CO
2Concentration and CO concentration have corresponding relation.
In said measurement air chamber, feed the CO of variable concentrations earlier respectively
2, to set up about CO
2Concentration,
With
Ratio,
With
Ratio between the CO of corresponding relation
2The concentration question blank; Then in said measurement air chamber, feed the CO of variable concentrations respectively, with set up about CO concentration,
With
Ratio between the CO gas concentration question blank of corresponding relation; In said measurement air chamber, feed CO gas to be measured at last, carry out gas concentration measurement, through relevant ratio inquiry CO
2Concentration question blank and CO gas concentration question blank can check in the CO gas concentration that will measure, can also check in CO simultaneously
2The concentration of gas.
Should be noted that at last: above embodiment only in order to the explanation the utility model technical scheme but not to its restriction; Although with reference to preferred embodiment the utility model has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can make amendment to the embodiment of the utility model perhaps is equal to replacement to the part technical characterictic; And not breaking away from the spirit of the utility model technical scheme, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (5)
1. triple channel infrared gas sensor that is used for CO gas high Precision Detection is characterized in that: it comprises the MCU control module, measure air chamber, be separately positioned on infrared light supply module and triple channel infrared gas detector, signal processing circuit module, signal output apparatus module and the power circuit module at said measurement air chamber two ends; Wherein, Said infrared light supply module comprises the broadband infrared light source, said triple channel infrared gas detector comprise three wavelength be respectively the optical filter of 4.0 μ m, 4.26 μ m, 4.6 μ m, with wavelength be 4.0 μ m optical filter corresponding reference passage, with wavelength be the corresponding CO of optical filter of 4.26 μ m
2Passage and be the corresponding CO passage of optical filter of 4.6 μ m with wavelength, the corresponding setting of three optical filters of the broadband infrared light source of said infrared light supply module and said triple channel infrared gas detector; Said MCU control module connects said infrared light supply module is launched three kinds of wavelength to said measurement air chamber with the broadband infrared light source of controlling said infrared light supply module IR; Said triple channel infrared gas detector connects said signal processing circuit module and said MCU control module successively so that with said reference channel, said CO
2Three output signals of passage and the collection of said CO passage are transferred to said MCU control module through after the said signal processing circuit resume module; Said MCU control module connects said signal output apparatus module so that through the signal output of said signal output apparatus module after with said MCU control module calculation process; Said power circuit module connects said infrared light supply module, said triple channel infrared gas detector, said signal processing circuit module and said MCU control module respectively so that supply voltage to be provided.
2. the triple channel infrared gas sensor that is used for CO gas high Precision Detection according to claim 1; It is characterized in that: it also comprises temperature compensation module; Said MCU control module connects said temperature compensation module so that carry out compensation data according to the sensor actual work temperature of said temperature compensation module collection, and said power circuit module connects said temperature compensation module so that supply voltage to be provided.
3. the triple channel infrared gas sensor that is used for CO gas high Precision Detection according to claim 2; It is characterized in that: said temperature compensation module comprises temperature voltage converter U4, operational amplifier U3 and resistance R 31; The voltage output end of said temperature voltage converter U4 connects the in-phase input end of said operational amplifier U3; The in-phase input end of the said operational amplifier U3 of one termination of said resistance R 31; Another termination power of said resistance R 31; The inverting input of said operational amplifier U3 connects the output terminal of said operational amplifier U3, and the output terminal of said operational amplifier U3 is as the output terminal of said temperature compensation module, and the temperature sense end of said temperature voltage converter U4 is as the temperature input end of said temperature compensation module.
4. the triple channel infrared gas sensor that is used for CO gas high Precision Detection according to claim 1 is characterized in that: said infrared light supply module comprises permanent power integrated circuit chip U5, operational amplifier U6, little constant-current circuit, triode Q1 and Q2, resistance R 11-R19, diode D1 and broadband infrared light source; Said little constant-current circuit comprises triode Q3, triode Q4, triode Q5, resistance R 110 and resistance R 111; The two ends of said resistance R 110 connect base stage and the collector of said triode Q3; The collector of said triode Q3 connects power supply; The base stage of said triode Q4 connects the emitter of said triode Q3; The collector of said triode Q4 connects the collector of said triode Q3, and the emitter of said triode Q4 connects the base stage of said triode Q5, and the two ends of said resistance R 111 connect base stage and the emitter of said triode Q5; The collector of said triode Q5 connects the base stage of said triode Q3, and the emitter of said triode Q5 is as the output terminal of said little constant-current circuit; The power output pin Pout of said permanent power integrated circuit chip U5 connects the inverting input of said operational amplifier U6; The in-phase input end of said operational amplifier U6 connects power supply through said resistance R 13; One end of said resistance R 14 connects the in-phase input end of said operational amplifier U6; The other end ground connection of said resistance R 14, an end of the said resistance R 15 of output termination of said operational amplifier U6, the base stage of the said triode Q1 of another termination of said resistance R 15; The base stage of said triode Q1 connects the anode of said diode D1; The negative electrode of said diode D1 connects the collector of said triode Q2 through said resistance R 19; The base stage of said triode Q2 connects an end of said resistance R 18; The other end of said resistance R 18 connects said MCU control module, the grounded emitter of said triode Q2 as the input end of said infrared light supply module; The collector of said triode Q1 connects an end of said resistance R 12; The end of the other end connecting resistance R11 of said resistance R 12; The output terminal of the said little constant-current circuit of another termination of said resistance R 11; The power of said permanent power integrated circuit chip U5 is controlled the end that positive pin RS+ connects said resistance R 11; The negative pin RS-of power control of said permanent power integrated circuit chip U5 connects the other end of said resistance R 11, the logic voltage pin LE of said permanent power integrated circuit chip U5 and inhibition voltage pin INHIBIT ground connection; The emitter of said triode Q1 connects an end of said broadband infrared light source; The other end ground connection of said broadband infrared light source; One end of the said broadband infrared light source of one termination of said resistance R 16; One end of the said resistance R 17 of another termination of said resistance R 16, the other end of the said broadband infrared light source of another termination of said resistance R 17, an end of said resistance R 17 connect the voltage input pin Vin of said permanent power integrated circuit chip U5.
5. the triple channel infrared gas sensor that is used for CO gas high Precision Detection according to claim 1; It is characterized in that: said signal processing circuit module comprises three road signal amplification circuits, filtering circuit and A/D change-over circuit, and said signal amplification circuit comprises two operational amplifiers, traffic filter, six resistance, four electric capacity; The inverting input of said first operational amplifier of one termination of said first resistance; Another termination reference data voltage of said first resistance; The two ends of said second resistance and said first electric capacity are connected in parallel on the inverting input and the output terminal of said first operational amplifier; The in-phase input end of said first operational amplifier connects an end of said the 3rd electric capacity; Another termination reference data voltage of said the 3rd electric capacity, the in-phase input end of said first operational amplifier of a termination of said the 5th resistance, the other end of said the 5th resistance connects the signal output part of said triple channel infrared gas detector as the input end of said signal amplification circuit; The inverting input of said second operational amplifier of one termination of said the 3rd resistance; Another termination reference data voltage of said the 3rd resistance; The two ends of said the 4th resistance and said second electric capacity are connected in parallel on the inverting input and the output terminal of said second operational amplifier; The in-phase input end of said second operational amplifier connects an end of said the 6th resistance; Another termination reference data voltage of said the 6th resistance, the in-phase input end of said first operational amplifier of a termination of said the 4th electric capacity; The input end of the said traffic filter of output termination of said first operational amplifier; The output terminal of the said traffic filter of another termination of said the 4th electric capacity; Said traffic filter connects reference data voltage, and the output terminal of said second operational amplifier is as the output terminal of said signal amplification circuit.
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| CN102608064A (en) * | 2012-04-10 | 2012-07-25 | 河南汉威电子股份有限公司 | Three-channel infrared gas sensor for CO gas high-precision detection |
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| CN102608064A (en) * | 2012-04-10 | 2012-07-25 | 河南汉威电子股份有限公司 | Three-channel infrared gas sensor for CO gas high-precision detection |
| CN102608064B (en) * | 2012-04-10 | 2014-09-10 | 河南汉威电子股份有限公司 | Three-channel infrared gas sensor for CO gas high-precision detection |
| CN104122224A (en) * | 2014-08-13 | 2014-10-29 | 成都君凌科创科技有限公司 | High-precision non-dispersion infrared ray gas sensor |
| CN105181621A (en) * | 2015-08-26 | 2015-12-23 | 电子科技大学 | Full-integration infrared gas sensor |
| CN105319160A (en) * | 2015-10-30 | 2016-02-10 | 中国电子科技集团公司第四十八研究所 | Temperature compensation device for infrared transmitter for gas-liquid two-phase flow detection and infrared detection device |
| CN105319160B (en) * | 2015-10-30 | 2020-06-26 | 中国电子科技集团公司第四十八研究所 | Temperature compensation device of infrared emitter for gas-liquid two-phase flow detection and infrared detection device |
| CN105911010A (en) * | 2016-06-12 | 2016-08-31 | 北京千安哲信息技术有限公司 | Trace gas pollutant detecting device and method |
| CN106525131A (en) * | 2016-11-24 | 2017-03-22 | 安徽庆宇光电科技有限公司 | Road side breathing zone air quality online monitoring system |
| CN106525131B (en) * | 2016-11-24 | 2019-02-22 | 安徽庆宇光电科技有限公司 | Roadside breathing zone air quality on-line monitoring system |
| CN107014955A (en) * | 2017-04-10 | 2017-08-04 | 安徽江南春包装科技有限公司 | A kind of Indoor Environment Detection system for marble paper packing box |
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