CN111220570A - Infrared multi-gas detection system and gas detection method - Google Patents
Infrared multi-gas detection system and gas detection method Download PDFInfo
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Abstract
本发明公开了一种红外多气体检测系统及气体检测方法，通过控制器调节可调谐量子级联激光器的发射波长，结合多通道红外探测器，控制器将探测器对通入待检测气体前后电压信号传输到人机交互平台进行后续信号处理。由于激光器的发射波长以及多通道红外探测器的每个探测单元可探测波长设置组合不同，且只用设置一个密封检测气室，使用红外多气体检测系统和检测方法可得到多气体的成分和浓度，且体积小，便携性好。
The invention discloses an infrared multi-gas detection system and a gas detection method. The emission wavelength of a tunable quantum cascade laser is adjusted by a controller, and combined with a multi-channel infrared detector, the controller connects the detector to the voltage before and after the gas to be detected is connected The signal is transmitted to the human-computer interaction platform for subsequent signal processing. Since the emission wavelength of the laser and the combination of wavelengths that can be detected by each detection unit of the multi-channel infrared detector are different, and only one sealed detection gas chamber is required, the composition and concentration of the multi-gas can be obtained by using the infrared multi-gas detection system and detection method. , and small size, good portability.
Description
Technical Field
The invention relates to the field of gas detection, in particular to an infrared multi-gas detection system and a gas detection method.
Background
With the progress of society and the development of scientific technology, the variety and the content of gas in the environment have great influence on the production and life of human beings, and the rapid and accurate detection of the gas concentration becomes an essential key technology in the processes of environment monitoring, safe production and industry.
Currently, a gas detection device for gas detection mainly includes an electrochemical gas sensor and a metal oxide semiconductor gas sensor.
The electrochemical gas sensor has the main advantages of high sensitivity and low price, but when carbon monoxide and hydrogen with the same concentration are detected, the specific type of the gas to be detected cannot be directly judged due to the fact that the electron migration amount generated by the electrochemical reaction is the same, and therefore the electrochemical gas sensor has the main defect of poor selectivity.
The metal oxide semiconductor type gas sensor is one of the gas sensors with the highest yield and the widest application range in the world at present, and has the advantages of short response time, high sensitivity, good stability and the like. However, such gas sensors require a high operating temperature and therefore a heating device, and as operating time increases, performance decreases and life is greatly shortened. The high false alarm rate is also a major disadvantage.
The infrared spectrum gas sensor mainly utilizes an infrared spectrum analysis technology, and each gas has a specific infrared absorption peak, so that the concentration and the type of the gas to be detected can be determined by detecting the reduced infrared absorption peak. The infrared spectrum gas sensor has the outstanding advantages of accurate measurement result, good sensitivity, large measurement dynamic range, fast response time, strong anti-interference capability and the like. However, the conventional infrared spectrum gas detection device generally detects a single gas, and if a plurality of gases are detected, a plurality of sets of gas detection devices are required.
Disclosure of Invention
In recent years, quantum cascade lasers are rapidly developed, and the types of gas detection components can be further improved if a tunable laser spectrum technology and a multi-channel pyroelectric detector are combined. In view of the problems in the background art, there is a need for an infrared multi-gas detection system capable of measuring the types and concentrations of multiple gases in an environment to be detected.
The invention aims to provide an infrared multi-gas detection system and a gas detection method so as to realize the detection of components and concentration of multi-component gas.
In order to achieve the purpose, the invention specifically provides the following technical scheme:
the infrared gas sensor is arranged in the sealed detection gas chamber; the infrared gas sensor comprises a tunable quantum cascade laser and a multi-channel infrared detector; the tunable quantum cascade laser is used as an infrared light source and outputs infrared light with the same wavelength as the absorption peak wavelength of the gas to be detected; the multi-channel infrared detector comprises 4 detection units, and each detection unit consists of a detection chip and an optical filter; the multiple detection units of the multichannel infrared detector comprise a reference detection unit and 1 to 3 detection units with different wavelengths; the reference detection unit is used for detecting infrared light emitted by the infrared light source; the detection unit is used for respectively detecting infrared light emitted by the infrared light source and absorbed by the gas to be detected in the sealed detection gas chamber; the signal acquisition module is connected with the multi-channel infrared detector and is used for respectively acquiring output voltage signals of all infrared detector units in the multi-channel infrared detector; and the human-computer interaction platform is connected with the infrared detector and is used for processing output voltage signals of all infrared detector units in the multi-channel infrared detector so as to identify components of the gas to be detected, judge the concentration of the components contained in the gas to be detected and display the components and the concentration of the gas.
Each detection unit comprises a detection chip and an optical filter, the detection chip is used for receiving radiation, and when physical change of non-electric quantity is caused, the detection chip can measure corresponding electric quantity change to generate a voltage signal; the filter is used for selectively passing infrared radiation with specific wavelength, and the center wavelength which can be passed by each detection unit is different.
Further, the spectral range of the tunable quantum cascade laser should completely include the characteristic absorption peak of all possible gases to be measured, and ensure that the characteristic absorption peak is high as much as possible. The absorption intensity of the comparison spectral line, the interference degree of the absorption spectral lines of other molecules, the stability of the spectral line and other factors are required to be determined comprehensively. The emission mode of the laser light source adopts a pulse emission mode.
Further, the controller comprises a laser driving module and an information acquisition module.
The laser driving module comprises a laser driving circuit which drives the laser to output optical signals, so that the central wavelength of the output scanning signals corresponds to the characteristic absorption peak of the gas to be detected. The information acquisition module comprises a signal amplification circuit, an analog signal conversion circuit and a signal acquisition circuit. The signal amplifying circuit amplifies the detected optical signal and converts an analog signal reflecting the gas concentration in the gas chamber into a digital signal through an analog signal conversion circuit. And finally, transmitting the digital signal to a man-machine interaction platform through a signal acquisition circuit for subsequent data processing.
Furthermore, the human-computer interaction platform comprises a display, a keyboard and a mouse.
The invention also provides a gas detection method based on the detection system, which comprises the following steps of;
a laser driving module of the controller controls the tunable quantum cascade laser to emit infrared light;
a reference detection unit in the multi-channel infrared detector is used for detecting infrared light emitted by an infrared light source, and a signal acquisition module of the controller acquires an output voltage signal of the detector unit;
introducing gas to be detected into the sealed detection air chamber through the air inlet, and closing the air outlet;
a detection unit in the multi-channel infrared detector is used for respectively detecting infrared light which is emitted by an infrared light source and absorbed by gas to be detected in a sealed detection gas chamber, and a signal acquisition module of a controller acquires an output voltage signal of the detector unit;
the man-machine interaction platform is used for processing output voltage signals of all infrared detector units in the multi-channel infrared detector so as to identify components of the gas to be detected, judge the concentration of the components contained in the gas to be detected and display the components and the concentration of the gas.
According to the infrared multi-gas detection system and the gas detection method provided by the embodiment of the invention, the components and the concentrations of various gases can be detected through the selection of the emission mode (pulse mode) of the tunable quantum cascade laser, the selection of the pulse wavelength of the laser light source and the selection of the wavelength of each detection unit of the multi-channel infrared detector.
One or more technical schemes provided by the invention at least have the following technical effects or advantages:
the system can detect various gases in a single sealed gas chamber, firstly, the tunable quantum cascade laser has a wider working wavelength range, and can meet the wavelength requirement of an emitted infrared light source, and secondly, the multi-channel structure of the infrared detector can realize the detection of different gases by the same infrared detector.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a block diagram schematic of an infrared multi-gas detection system in accordance with one embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a gas detection method using an infrared multi-gas detection system in accordance with one embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Example 1;
the embodiment provides an infrared multi-gas detection system, which refers to fig. 1 and comprises a tunable quantum cascade laser light source 1, a sealed detection gas chamber 2, a multi-channel infrared detector 3, a controller 4, a human-computer interaction platform 5, a gas inlet 6 and a gas outlet 7. The laser driving module 41 of the controller 4 is connected with the tunable quantum cascade laser light source 1, the signal acquisition module 42 of the controller 4 is connected with the multi-channel infrared detector 3, and the human-computer interaction platform 5 is connected with the controller 4.
The multi-channel infrared detector 3 comprises 4 detection units, each detection unit has different absorption wave bands, and can be a combination of characteristic absorption wave bands of different gases to be detected, and can also be a combination of different characteristic absorption wave bands of the same gas to be detected. One of the detection units is used as a reference detection unit for detecting infrared light emitted by the infrared light source; the other detection units are used as detection units for respectively detecting infrared light emitted by the infrared light source and absorbed by the gas to be detected in the sealed detection gas chamber, and the absorption wave bands of the three detection units are at least two different.
The multichannel infrared detector 3 is fixed in the air chamber through a detector pin and is parallel to the emitting surface of the tunable quantum cascade laser light source 1.
The laser driving module 41 of the controller 4 drives the laser to output the optical signal through the laser driving circuit, so that the central wavelength of the output scanning signal corresponds to the characteristic absorption peak of the gas to be measured
And a signal acquisition module 42 of the controller 4 is connected with the multi-channel infrared detector 3 and respectively acquires output voltage signals of each infrared detector unit in the multi-channel infrared detector.
The information acquisition module 42 includes a signal amplification circuit, an analog signal conversion circuit, and a signal acquisition circuit. The signal amplifying circuit amplifies the detected optical signal and converts an analog signal reflecting the gas concentration in the gas chamber into a digital signal through an analog signal conversion circuit. And finally, the digital signals are transmitted to the man-machine interaction platform 5 through the signal acquisition circuit 42 for subsequent data processing.
The tunable quantum cascade laser 1 and the multi-channel infrared detector 3 are beneficial to reducing the device size of an infrared multi-gas detection system and improving the portability.
The method of gas detection is described below with reference to the accompanying drawings.
In one embodiment of the present invention, the steps of the method of detecting a gas using the aforementioned infrared multi-gas detection system.
Firstly, a laser driving module of a controller controls a tunable quantum cascade laser to emit infrared light;
a reference detection unit in the multi-channel infrared detector is used for detecting infrared light emitted by an infrared light source, and a signal acquisition module of the controller acquires an output voltage signal of the detector unit;
introducing gas to be detected into the sealed detection air chamber through the air inlet, and closing the air outlet;
a detection unit in the multi-channel infrared detector is used for respectively detecting infrared light which is emitted by an infrared light source and absorbed by gas to be detected in a sealed detection gas chamber, and a signal acquisition module of a controller acquires an output voltage signal of the detector unit;
the man-machine interaction platform is used for processing output voltage signals of all infrared detector units in the multi-channel infrared detector so as to identify components of the gas to be detected, judge the concentration of the components contained in the gas to be detected and display the components and the concentration of the gas.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
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Cited By (5)
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| CN111982851A (en) * | 2020-08-27 | 2020-11-24 | 青岛市光电工程技术研究院 | Alcohol gas detection device and detection method |
| CN113008828A (en) * | 2021-02-22 | 2021-06-22 | 电子科技大学 | Near-infrared portable crop component content testing device and method |
| CN113029996A (en) * | 2021-03-31 | 2021-06-25 | 山东大学 | Hydrogen purity online detection instrument and use method and application thereof |
| CN114813610A (en) * | 2022-04-27 | 2022-07-29 | 西安智光物联科技有限公司 | Infrared multi-gas detection system and gas detection method |
| CN117571647A (en) * | 2023-12-14 | 2024-02-20 | 深圳市诺安智能股份有限公司 | Multichannel gas sensor based on wavelength division multiplexing and gas detection method |
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Cited By (6)
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| CN114813610A (en) * | 2022-04-27 | 2022-07-29 | 西安智光物联科技有限公司 | Infrared multi-gas detection system and gas detection method |
| CN117571647A (en) * | 2023-12-14 | 2024-02-20 | 深圳市诺安智能股份有限公司 | Multichannel gas sensor based on wavelength division multiplexing and gas detection method |
| CN117571647B (en) * | 2023-12-14 | 2024-08-30 | 深圳市诺安智能股份有限公司 | Multichannel gas sensor based on wavelength division multiplexing and gas detection method |
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