System for measuring gas concentration of optical fiber grating with tunable filtering characteristic

A technology of optical fiber grating and tuning filter, which is applied in the direction of color/spectral characteristic measurement, measuring device, material analysis through optical means, etc., to achieve the effect of cost reduction, easy identification and concentration measurement

Inactive Publication Date: 2009-04-22
ZHEJIANG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of existing gas concentration measurement technology, and propose a gas concentration measurement system with tunable filter characteristics of fiber grating

Method used

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  • System for measuring gas concentration of optical fiber grating with tunable filtering characteristic
  • System for measuring gas concentration of optical fiber grating with tunable filtering characteristic
  • System for measuring gas concentration of optical fiber grating with tunable filtering characteristic

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Embodiment Construction

[0013] Such as figure 1 As shown, the gas concentration measurement system of fiber Bragg grating tunable filter characteristics includes a broadband light source 1, a circulator 2, a transmission fiber 3, a fiber Bragg grating 4, a piezoelectric ceramic 5, a coupler 6, a collimator 7, and a gas absorption cell 8 , coupling lens 9, multimode optical fiber 10, lock-in amplifier 11, photodetector 12, control power driver 13, data acquisition card 14, computer 15, the broadband light that broadband light source 1 sends through circulator 2, transmission fiber 3, Fiber Bragg grating 4 obtains narrow-band laser light, and then is divided into two paths by coupler 6, one path is a reference light path, and the other path is a gas absorption light path, and a photodetector 12, a data acquisition card 14, and a computer 15 are sequentially arranged on the reference light path. There are collimator 7, gas absorption cell 8, coupling lens 9, multimode optical fiber 10, transmission opti...

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Abstract

The invention discloses a gas concentration measuring system with fiber grating tunable optical filter property. Wideband light emitted from a wideband light source passes through a circulator, a transmission fiber and a fiber grating successively to obtain a narrowband laser, and then is divided into two paths by a coupler, one is a reference path and the other is a gas absorption path. The reference path is provided with a photodetector, a data collecting card, a computer successively; while the gas absorption path is provided with a collimator, a gas absorption pond, a coupling lens, a multimode fiber, a transmission fiber, a lock-in amplifier, a photodetector, a data collecting card, and a computer successively; a piezoceramics is arranged under the fiber grating, and the lock-in amplifier is connected with the piezoceramics through a control power driver. The gas concentration measuring system can perform good scanning on absorption spectrum of measured gas and obtain favorable measuring result, furthermore, and can facilitate realizing polycomponent gas concentration identification and concentration measurement by using fiber grating group, which greatly reduces the cost of the measuring system.

Description

technical field [0001] The invention relates to a measurement system for tail gas, exhaust gas or boiler flue gas, in particular to a gas concentration measurement system with tunable filter characteristics of optical fiber gratings. Background technique [0002] In the existing gas concentration measurement technology, using the Beer-Lambert law of the absorption characteristics of the gas to be measured, a tunable semiconductor laser is generally used to detect the gas concentration of tail gas, exhaust gas or boiler flue gas, etc., and calculate by detecting the attenuation of the absorbed light intensity Measured gas concentration. [0003] The disadvantages of the existing gas concentration measurement technology are: the tunable semiconductor laser used is too narrow in tunable range, and the temperature drift is large. If the concentration of multi-component gas is measured, it is necessary to integrate multiple tunable semiconductor lasers or modify the optical path....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/17
Inventor 岑可法周昊黄雪峰
Owner ZHEJIANG UNIV
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