Light path deflection-based double-light-path single-sensor gas infrared detection system and method

A technology of optical path deflection and single sensor, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of deviation of gas detection results and the difficulty of keeping two infrared detectors consistent, and achieve simple structure, eliminate light source drift and environmental changes , save the effect of light modulation system

Active Publication Date: 2014-06-18
XI AN JIAOTONG UNIV +1
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Problems solved by technology

Due to long-term use, the characteristics of the two infrared detectors will also drift to a certain extent, and the drift of the two infrared detectors is often difficult to keep consistent, which brings deviations to the gas detection results

Method used

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  • Light path deflection-based double-light-path single-sensor gas infrared detection system and method
  • Light path deflection-based double-light-path single-sensor gas infrared detection system and method
  • Light path deflection-based double-light-path single-sensor gas infrared detection system and method

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] as attached figure 2 As shown, a single sensor dual optical path gas detection system based on optical deflection includes an infrared light source 1, a deflection mirror 10, a reference optical path fixed mirror 11, a detection optical path fixed mirror 12, a reference gas chamber 6, a filter gas chamber 5, Deflection device, detection gas chamber 7, an infrared detector 8 and its conditioning circuit, and microprocessor. The light emitted by the infrared light source 1 is reflected by the deflecting reflector 10 and then enters the reference gas chamber 6 through the reference light path fixed reflector 11. When the deflecting reflector 10 or the infrared light source 1 is deflected, the light emitted by the infrared light source 1 passes through the deflecting reflector 10 reflection and then enter the detection gas chamber 7 through the fixed mirror 12 o...

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Abstract

The invention discloses a light path deflection-based double-light-path single-sensor gas infrared detection system and method. The system comprises an infrared light source, a reference gas chamber, a detection gas chamber, a deflection reflector, an infrared photoelectric detector and a deflection device. The deflection device drives the light source or a reflector to generate deflection, so that light paths are switched between the reference gas chamber and the detection gas chamber and reach the infrared detector in a time-sharing mode; the infrared detector compares the intensity of detected light signals twice, takes a common logarithm of the ratio of the two light signals as a detection signal and converts the detection signal into gas concentration through polynomial fitting according to a calibration sample. By adoption of the infrared sensor, the influence brought by light source drift is eliminated, and the influence brought by characteristic drift of the sensor also can be eliminated.

Description

technical field [0001] The invention belongs to the field of spectrum online analysis of gas composition and concentration, and in particular relates to a gas infrared detection system and method based on optical path deflection with two optical paths and one sensor. Background technique [0002] Infrared spectroscopy can realize the quantitative analysis of almost all polar gases, and neither consumes any materials nor produces any waste during the working process, but also can work for a long time and has low maintenance costs, so it is an important method for online gas analysis. method. For some specific occasions, there are few gas components that need to be detected. For example, in some denitrification applications, it is only necessary to detect NO, and carbon emission detection only needs to detect CO 2 That's it. The direct use of spectrometer for analysis has high accuracy, but the cost is too high. In this case, monochromatic light or narrow-band light is often...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
Inventor 汤晓君梁运涛冯文彬罗海珠孙勇田富超
Owner XI AN JIAOTONG UNIV
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