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A spiral multi-path device for measuring gas concentration

A gas concentration, spiral-type technology, applied in the field of optical measurement, can solve the problems of influence, difficult coincidence of the main optical axes of two concave mirrors, etc., and achieve the effect of improving sensitivity and accuracy

Active Publication Date: 2017-10-20
山西阳谱光电科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to coincide the main optical axes of the two concave mirrors in practical applications, and small vibrations will have a great impact on it

Method used

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  • A spiral multi-path device for measuring gas concentration
  • A spiral multi-path device for measuring gas concentration
  • A spiral multi-path device for measuring gas concentration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] See attached image 3 The spiral multi-path device for measuring gas concentration provided by Embodiment 1 of the present invention includes a laser light source module 1 , a thin lens 2 , a spiral multi-path cell 6 and an output signal detection module 5 . The spiral multi-path path cell includes a concave spiral optical cavity 63 , an incident window 61 and an exit window 64 , and the thin lens 2 is located in front of the incident window 61 .

[0042] The laser light emitted by the laser light source module 1 enters the concave spiral optical cavity through the incident window 61 after passing through the thin lens 2, and converges near the center of the spiral concave spiral optical cavity 63, and is reflected repeatedly by the concave spiral optical cavity 63. The light beam emitted from the exit window 64 is emitted, and the output signal detection module 7 detects and processes the data of the light beam emitted from the exit window.

[0043] In addition, the l...

Embodiment 2

[0046] See attached Figure 4 , is the spiral multi-path device for measuring the gas concentration provided by Embodiment 2 of the present invention. The main difference from the spiral multi-optical path device for measuring gas concentration provided by Embodiment 1 of the present invention is that Embodiment 2 of the present invention also includes a high-frequency modulation circuit 3 and an MCU (single-chip microcomputer) 4 . In addition, in the second embodiment of the present invention, the laser light source module 1 is composed of a laser temperature and current controller 11 and a laser 12 . The output signal detection module 5 includes a photodetector 51 , a lock-in amplifier 52 and an A / D conversion circuit 53 .

[0047] The MCU4 outputs a 20HZ low-frequency triangular wave for the laser temperature and current controller 11 to modulate the laser wavelength to correspond to the spectrum of the absorbing gas. The high-frequency modulation circuit 3 is used to inp...

Embodiment 3

[0052] See attached Figure 5 The difference between the spiral multi-optical path device for measuring gas concentration provided by Embodiment 3 of the present invention and the spiral multi-optical path device for measuring gas concentration provided by Embodiment 2 of the present invention is that the spiral multi-optical path device used The pool 6 also includes an incident window sealing valve 601 , a sealing outer cover 602 and a sealing outer cover 607 and an exit window sealing valve 606 . See attached Image 6 , the edge of the spiral multi-path cell 6 has a groove 605, which is used to put an O-ring, and the sealing outer cover 601 and the sealing inner cover 607 are pressed on the upper and lower ends of the spiral multi-path cell 6 through the O-ring, thereby sealing Spiral multi-path cell 6.

[0053] refer to Image 6 , The entrance window sealing valve 601 is composed of the entrance window chassis 6011 , the plane mirror 6012 and the entrance window top plat...

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Abstract

The invention discloses a spiral multi-optical path device for measuring gas concentration, which belongs to the field of optical measurement of gas concentration. The device includes a laser light source module, a spiral multi-optical path cell and an output signal detection module. After the laser light emitted by the laser light source module is reflected back and forth by the spiral multi-optical path cell, it is detected by the output signal detection module to obtain the gas concentration. When the device measures the gas concentration, it can effectively reduce the volume of the optical path pool and lengthen the effective optical path of the light action, thereby effectively improving the spectral detection sensitivity and improving the accuracy of the concentration measurement of the absorbing gas.

Description

technical field [0001] The invention relates to the field of optical measurement, in particular to an optical device for measuring gas concentration. Background technique [0002] With the development of the economy, the speed of human development and utilization of the earth has far exceeded the renewable cycle of the earth, so many environmental problems have emerged, the most serious of which is the problem of air quality. Industrial waste gas, vehicle exhaust, and coal combustion all cause serious air pollution. Therefore, we need real-time monitoring of the air to fully understand the quality of the air in order to make corresponding countermeasures. [0003] There are many methods for measuring air concentration, such as chromatography, ray absorption method and spectral absorption method. Among them, spectral absorption method is widely used and the technology is relatively mature. The multiple reflection cell is a very important part of the absorption spectroscopy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39
Inventor 李传亮邱选兵吴飞龙刘电广吴应发魏计林
Owner 山西阳谱光电科技有限责任公司
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