Long-optical-path and light-intensity-adjustable infrared methane gas sensor

A methane gas, long optical path technology, applied in the field of non-dispersive infrared methane sensors, to achieve the effects of increasing absorption optical path, increasing power consumption, and optimizing gas chamber structure

Inactive Publication Date: 2012-06-20
TAIYUAN UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem that the existing non-dispersive infrared methane sensor can only measure relatively high concentration (>100ppm) methane gas, the present invention provides a long optical path and adjustable light intensity infrared methane gas sensor for low concentration methane gas measurement

Method used

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  • Long-optical-path and light-intensity-adjustable infrared methane gas sensor

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Embodiment Construction

[0022] Long optical path and light intensity adjustable infrared methane gas sensor, including an infrared emitter composed of an infrared light source 1 and a spherical reflector 2, a pyroelectric methane detector 4 with a signal and reference window 5, and a straight tube gas chamber 11. The two ends of the straight pipe air chamber 11 are respectively covered with a detector fixed joint 3 and a plane mirror joint 8; the side walls of the two ends of the straight pipe air chamber 11 are respectively provided with a ventilation hole 10; the pyroelectric methane detection The detector 4 and the infrared emitter are installed on the fixed joint 3 of the detector; an iron plane reflector 6 is provided close to the inner side of the plane reflector joint 8; a groove is provided on the outer end surface of the plane reflector joint 8; There is a disc small magnet 9; a through hole is opened on the top of the plane reflector joint 8, and an adjusting screw 7 is screwed through the t...

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Abstract

The invention relates to a non-dispersive infrared methane sensor, in particular to a long-optical-path and light-intensity-adjustable infrared methane gas sensor, solving the problem that the traditional non-dispersive infrared methane sensor can only measure methane gas with higher concentration (over 100 ppm). The long-optical-path and light-intensity-adjustable infrared methane gas sensor comprises an infrared emitter, a pyroelectric methane detector and a straight-tube air chamber, wherein the infrared emitter consists of an infrared light source and a spherical reflecting mirror and the pyroelectric methane detector is provided with a signal and reference window; a detector fixing connector and a plane reflecting mirror connector respectively cover two ends of the straight-tube air chamber; and two vent holes are formed on sidewalls on the two ends of the straight-tube air chamber. Compared with most of the traditional infrared gas sensors, the long-optical-path and light-intensity-adjustable infrared methane gas sensor has the outstanding characteristics that: the absorption optical path is greatly increased, meanwhile, the power consumption of the light source is indicated to be dispensable of significant increase by preliminary tests as corresponding optimization is carried out on the structure of the air chamber.

Description

technical field [0001] The invention relates to a non-dispersive infrared methane sensor, in particular to a long optical path and adjustable light intensity infrared methane gas sensor. Background technique [0002] At present, the direct detection method of detecting urban natural gas leakage on the ground without digging and covering soil is the most widely used method. Since urban natural gas pipelines are generally buried at a depth of 2-3m underground, the concentration of leaked natural gas is already very low when it diffuses to the surface. Therefore, the direct detection method requires the gas detector used to have a very low concentration measurement lower limit. [0003] The main component of natural gas is methane (CH 4 ), low-concentration methane detectors can be used to detect leaks in natural gas pipelines. Commonly used methane gas sensors, such as catalytic combustion and metal-oxide-semiconductor (MOS) gas-sensitive resistance methane gas sensors, can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/01G01N21/3504
Inventor 朱子鹏
Owner TAIYUAN UNIV OF TECH
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