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Repeated absorption type trace gas detection system

A technology of trace gas and detection system, which is applied in the direction of measuring devices, color/spectral characteristic measurement, instruments, etc., can solve the problems of high requirements for instrument placement and precision, and achieve the increase of gas absorption optical path, improve High detection accuracy and low optical loss

Inactive Publication Date: 2019-03-01
SHANDONG UNIV
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Problems solved by technology

[0003] The application number is CN201310441096.0, and the applicant is Henan Hitachi Co., Ltd. The invention "Long optical path gas detection device with fine-tuning mechanism" proposes a method of increasing the optical path by using multiple reflections. This method uses a fine-tuning mirror To ensure the accuracy of the optical path, but there are high requirements for the placement and precision of the instrument

Method used

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Examples

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Embodiment 1

[0017] Such as figure 1 As shown, a multiple absorption trace gas detection system includes a temperature-controlled current source 1, a light source 2, an acousto-optic modulator 3, a signal generator 4, a 2*2 optical switch 5, a gas chamber 6, and a photodetector 7 , a transimpedance amplifier 8, a data acquisition card 9, a computer 10, characterized in that the temperature-controlled current source 1 is connected to the light source 2, the light source 2 is connected to the input end of the acousto-optic modulator 3 through an optical fiber, and the output end of the acousto-optic modulator 3 passes through The optical fiber is connected to the a input end of the 2*2 optical switch 5, the b output end of the 2*2 optical switch 5 is connected to the input end of the photodetector 7 through the optical fiber, the c input end and the d output end of the 2*2 optical switch 5 Connected to the gas chamber 6 through optical fiber, the gas absorption annular cavity is composed of ...

Embodiment 2

[0021] Same as Example 1, except that the laser model is ZG-1512, and the center wavelength is 1512nm, corresponding to the gas absorption peak of ammonia. The gas to be tested filled in the gas chamber 6 is ammonia.

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Abstract

The invention provides a repeated absorption type trace gas detection system and belongs to the technical field of optical fiber gas sensing. The repeated absorption type trace gas detection system comprises a light source, an acoustic-optical modulator, a 2*2 optical switch and a gas chamber, wherein a temperature control current source is connected to the light source; the light source is connected to an input end of the acoustic-optical modulator; an output end of the acoustic-optical modulator is connected to an input end a of the 2*2 optical switch; an output end b of the 2*2 optical switch is connected to the input end of a photoelectric detector; an input end c and an output end d of the 2*2 optical switch are connected to the gas chamber; the 2*2 optical switch and the gas chamberform a gas absorption ring-shaped cavity; the output end of the photoelectric detector is connected to the input end of a trans-impedance amplifier; the output end of the trans-impedance amplifier isconnected to a data acquisition card; the data acquisition card is connected to a computer; the acoustic-optical modulator and a signal end of the 2*2 optical switch are respectively connected to a signal generator. The repeated absorption type trace gas detection system is capable of increasing gas absorption optical distance; the detection accuracy is improved; meanwhile, the system has the advantages of simple structure and low light loss.

Description

technical field [0001] The invention relates to a long optical path trace gas detection technology, in particular to a multi-absorption trace gas detection system. The invention belongs to the technical field of optical fiber gas sensing. Background technique [0002] Tunable semiconductor laser absorption spectroscopy technology is a highly sensitive trace gas detection technology based on photoelectric conversion process. When the modulated laser interacts with the gas to be measured, the gas molecules produce selective absorption, the laser of the corresponding wavelength is partially absorbed, and the intensity of the transmitted light decreases. Digital signal processing and other methods are used to obtain the information of the light intensity after absorption, and then fit the inversion gas concentration. According to Beer-Lambert's law, increasing the absorption path of gas can improve the detection accuracy. [0003] The application number is CN201310441096.0, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/01G01N21/39G01N2021/0112
Inventor 冯怡文常军张秦端孙稼琛
Owner SHANDONG UNIV
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