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Microcavity double-grating and optical-fiber gas sensing system and method

A sensing system and gas sensor technology, used in the fields of safety, analytical instruments, and gas chemistry, which can solve the problems of high cost, great influence of ambient temperature, and inability to compensate for temperature.

Inactive Publication Date: 2009-06-17
重庆工学院
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  • Description
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Problems solved by technology

These sensing systems have the advantages of telemetry, high precision, electrical insulation, and no potential safety hazards; their disadvantages include all the shortcomings of the optical fiber White gas chamber absorption gas sensor (as mentioned above), and also include the high cost of the sensor (optical fiber isolator or ring) Expensive device), complex system structure, large influence of ambient temperature (no temperature compensation) and other deficiencies

Method used

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  • Microcavity double-grating and optical-fiber gas sensing system and method
  • Microcavity double-grating and optical-fiber gas sensing system and method
  • Microcavity double-grating and optical-fiber gas sensing system and method

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Embodiment Construction

[0049] Further illustrate the present invention below in conjunction with accompanying drawing:

[0050] Such as figure 1 As shown, the sensing system of the present invention is composed of a broadband light source A, optical fibers B1-B3, a broadband coupler Cw, a double-grid optical fiber microcavity gas sensor S, a spectrum demodulator D and a computer E. Its composition method is: a broadband light source A with a center wavelength of 1330nm and a bandwidth of 40nm is connected to an input end of the broadband coupler Cw through an optical fiber B1, and the output end of the broadband coupler Cw is connected to the double-grid optical fiber microcavity gas sensor through an optical fiber B3. At the front end, the other input end of the broadband coupler Cw is connected to the optical fiber input end of the spectral demodulator D through the optical fiber B2, and the data output end of the spectral demodulator D is through the GPIB interface (or standard data interface suc...

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Abstract

A micro cavity gas sensing system with double-grid comprises wide band light source, optical fiber, wide band coupler, micro cavity gas transducer with double-grid, spectrum demodulator and computer. Its sensing method includes calibrating out constant of transducer and influence factor of temperature on sensing system then sensing out concentration of measured gas.

Description

technical field [0001] The invention belongs to the technical fields of analytical instruments, gas chemistry and safety, and in particular relates to a double-grid optical fiber microcavity gas sensing system and a sensing method. Background technique [0002] Every major coal mine accident has brought huge property losses, especially irreparable losses to the lives of mining workers. One of the main causes of accidents in coal mines is an explosion caused by gas. The detection and control of coal mine gas (the main component is methane CH4) gas concentration is an effective method to avoid coal mine vicious accidents. The gas sensor and its system are the key equipment for mine gas comprehensive control and disaster prediction, and are widely valued by people. [0003] Gas sensor is a kind of gas sensor. At present, mine gas sensors mainly include semiconductor gas sensors, electrochemical sensors, carrier catalytic components, light interference or infrared absorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/27G06F19/00
Inventor 曾祥楷杨泽林
Owner 重庆工学院
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