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Laser gas detection platform with multiple-reflection long-optical-path high-temperature sample chamber

A technology of multiple reflection and gas detection, applied in color/spectral characteristic measurement, measuring device, material analysis through optical means, etc. It can solve the problems such as difficult to adjust the position and angle, difficult to clean the reflector, and difficult to reach the optical path, etc. Achieve the effect of low cost, reduce the cost of structural parts, and high measurement accuracy

Inactive Publication Date: 2016-07-13
中钢集团武汉安全环保研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Extending the optical path is generally achieved by multiple reflections of the light by the reflector, but once the reflector is installed in the gas chamber, its position and angle are difficult to adjust, making it difficult to achieve the ideal optical path
Moreover, the traditional return gas chamber has disadvantages such as high cost and difficult cleaning of the mirror after contamination.

Method used

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  • Laser gas detection platform with multiple-reflection long-optical-path high-temperature sample chamber
  • Laser gas detection platform with multiple-reflection long-optical-path high-temperature sample chamber
  • Laser gas detection platform with multiple-reflection long-optical-path high-temperature sample chamber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: We pass Figure 5 The shown laser emitting device 2 injects and measures NH 3 Corresponding to the laser with a wavelength of 1512nm, turn on the heating device to simulate the on-site environment, such as Figure 6 The optical path adjustment device shown in the figure adjusts the optical path. The emitted light from the laser emitting device 2 enters the inner cavity of the sample chamber housing 11 through the incident window 7, passes through the exit window 15, and then hits the concave reflector 19. After multiple reflections between the conjugate concave reflector 3, the concave reflector 19, the incident window 7, and the exit window 15, the laser light is emitted from the exit of the concave reflector 19 to the laser receiving device 20.

[0062] Such as Figure 7 Shown is the simulated light spot effect diagram, the gas to be detected passes into the sample chamber shell 11 from the gas inlet 9 and is discharged from the gas outlet 13 .

[0063] ...

Embodiment 2

[0066] Embodiment 2: Different from Embodiment 1, since the absorption signal intensity of the gas to be measured is relatively high or the required detection accuracy is low, a long optical path is not required, so a sample that meets the required length of the application is directly used The chamber casing 11 is used as the detection sample chamber. At this time, there is no need to arrange a conjugate laser reflection device in the sample chamber casing 11; and the laser light emitted by the laser emitting device 2 directly enters the sample chamber casing 11, and then the sample chamber casing The other end of 11 is collimated and converged to the laser receiving device 20 after being emitted.

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Abstract

The invention relates to a laser gas detection platform with a multiple-reflection long-optical-path high-temperature sample chamber.The laser gas detection platform comprises a platform base (22), a sample chamber shell (11), an optical path adjusting device (1), a laser emitting device (2), a receiving device installation base (21), a laser receiving device (20) and a conjugate laser reflecting device.A gas inlet (9) is formed in the upper portion of one side of the sample chamber shell (11), a gas outlet (13) is formed in the upper portion of the other side of the sample chamber shell (11), and an incidence window (7) and an emergence window (15) are arranged at the two ends of the sample chamber shell (11) respectively.The laser emitting device (2) is installed on the optical path adjusting device (1), and the laser receiving device (20) is installed on the receiving device installation base (21).The conjugate laser reflecting device comprises a concave reflecting mirror (3) and a concave reflecting mirror (19).The gas detection platform is high in measuring precision; as laser spots are small, a sample gas optical path through which detection lasers pass is prolonged to 10-30 times through multiple reflection; the size is small, and the length of the long-optical-path sample chamber is reduced due to the multiple reflection structure; the cost is low, a complex optical-mechanical structure is simplified, and the structural member cost of a measuring system is reduced.

Description

technical field [0001] The invention relates to a laser gas detection platform, in particular to a gas detection platform for a multi-reflection long optical path high-temperature sample chamber. Background technique [0002] With the development of society and economy, the relationship between atmospheric resources and people is getting closer. On the one hand, air pollution is one of the most concerned issues, and it is urgent to monitor various harmful, toxic, flammable and explosive gases produced in industry and transportation; on the other hand, when using various gases, Such as the development and use of natural gas, coal gas, liquefied petroleum gas, etc., or the gas system used in the aerospace industry, the detection of various gas concentrations is indispensable. [0003] In the case of unsaturated weak absorption, the light intensity attenuation of the semiconductor laser passing through the measured gas can be expressed by the Beer-Lambert relationship: [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/03G01N21/31
CPCG01N21/0303G01N21/31
Inventor 吕媛媛汪冰冰刘祯李潘陈聪司涛逯悦田健
Owner 中钢集团武汉安全环保研究院有限公司
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