Long-optical-path miniature infrared gas chamber and infrared gas sensor

A gas sensor and long optical path technology, which is applied in the field of infrared sensing, can solve problems affecting the accuracy of detection signals, light reflection attenuation, and increasing optical path, so as to ensure optical power intensity, avoid scattering attenuation, and improve resolution. Effect

Active Publication Date: 2021-09-03
SHENZHEN NUOAN SENSOR TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese utility model patent with the announcement number CN202092949U proposes a "C"-shaped optical channel with multiple continuous reflective surfaces, and the Chinese invention patent with the patent publication number CN101825566A proposes a "spiral-shaped" air channel. Chamber channels, such as US patent US7244939B2, proposes a multiple-reflection "ring" air chamber channel. The reflection of light in thes

Method used

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  • Long-optical-path miniature infrared gas chamber and infrared gas sensor
  • Long-optical-path miniature infrared gas chamber and infrared gas sensor
  • Long-optical-path miniature infrared gas chamber and infrared gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example one

[0041] like figure 1 , figure 2 As shown, a long optical range micro-infrared gas chamber includes an optical air chamber body, an inner wall coated or electroplated in an optical air chamber body. The optical air chamber body is in contact with the outside to be tested by the intake passage (not shown), and the gas in the outside is entered into the inside of the optical air chamber main body through the intake passage.

[0042] The optical air chamber body includes an annular outer reflective wall 10 and an inner reflective wall 20 provided inside the outer reflective wall 10, and the outer reflective wall 10 and the inner reflective wall 20 are connected to the bottom plate 11, and the bottom plate 11 is opened to pass through light detection. The detector through hole 12 of the unit is also opened on the bottom plate 11 (not shown) for passing through the light source. The outer reflective wall 10 is interlaced in the circumferential direction in the circu...

Example Embodiment

[0057] Example 2

[0058] like Image 6 , Figure 7 As shown in which a long optical path gas cell Mini IR, in Embodiment 1 except that the number of sides of a regular polygon embodiment of the present embodiment n is 6, i.e., the number of the concave mirror 201 and 101 are planar mirrors 6, i.e., 6 planes arranged in a hexagonal mirror 201, concave mirror 101 surface 6 provided on the periphery of a regular hexagon.

[0059] like Figure 10 As shown, the center of curvature of each concave mirror 101 (i.e., the center O2) located corresponding interior angle of a regular polygon the center line (i.e., the connection with the interior angle of a regular polygon the center), the position of curvature of each concave mirror 101 the same, and a radius of curvature R satisfy:

[0060] Where d is the center of the concave mirror 101 to the distance from the vertex of a regular polygon adjacent thereto, a is the side length of the regular polygon, the number of edges n is a regular pol...

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Abstract

The invention discloses an infrared gas sensor of a long-optical-path miniature infrared gas chamber in the technical field of infrared sensing. The infrared gas sensor comprises a circuit board and the long-optical-path miniature infrared gas chamber, and a light source and a light detector on the circuit board extend into an optical gas chamber main body of the long-optical-path miniature infrared gas chamber. The long-optical-path miniature infrared gas chamber comprises an optical gas chamber body, the optical gas chamber body comprises an annular outer reflecting wall and an inner reflecting wall arranged in the outer reflecting wall, the outer reflecting wall comprises a plurality of concave reflecting mirrors, the side faces of the concave reflecting mirrors are sequentially connected to form a ring, the inner reflecting wall comprises a plurality of plane reflecting mirrors, the side faces of the plane reflecting mirrors are sequentially connected to form a regular polygon, and the curvature center of each concave reflecting mirror is located on the center line of the corresponding inner angle in the regular polygon. Through the special optical gas chamber structural design, the requirement of the gas chamber for the divergence angle of a light source is reduced, a large effective optical path can be ensured in an effective volume, and the gas detection resolution of the sensor is improved.

Description

technical field [0001] The invention relates to the technical field of infrared sensing, in particular to a long optical path miniature infrared gas chamber and a sensor. Background technique [0002] Industrial gas sensors are an important guarantee for gas safety. With the rapid development of my country's economy and the continuous optimization of industrial applications of the Internet of Things, industrial sensors have gradually developed in the direction of low power consumption, miniaturization, and portability in recent years. Among them, the infrared optical gas sensor has the advantages of fast response, high measurement accuracy, strong anti-interference ability, long service life, etc., and will not appear harmful gas poisoning, aging, etc., and has been widely recognized by the market. The working principle of the infrared optical gas sensor is to use the natural vibration and rotation frequency of gas molecules to absorb the infrared light signal of a specific ...

Claims

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Application Information

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IPC IPC(8): G01N21/3504G01N21/01
CPCG01N21/3504G01N21/01G01N2021/0112
Inventor 卿笃安曹绍情
Owner SHENZHEN NUOAN SENSOR TECH CO LTD
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