Photonic crystal fiber based mixed gas concentration detecting method and apparatus thereof

A photonic crystal fiber, mixed gas technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of flammable gas leakage, threat to production and life safety, and rarely mentioned in the application research of DOAS technology.

Inactive Publication Date: 2013-09-25
TIANJIN UNIV
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Problems solved by technology

[0004] 2) In terms of fire and explosion protection, the leakage of flammable gas seriously threatens people's production and l

Method used

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  • Photonic crystal fiber based mixed gas concentration detecting method and apparatus thereof
  • Photonic crystal fiber based mixed gas concentration detecting method and apparatus thereof
  • Photonic crystal fiber based mixed gas concentration detecting method and apparatus thereof

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Embodiment Construction

[0036] The object of the present invention is to provide a system for detecting indoor air quality based on a hollow-core photonic crystal fiber. The method adopted and the new gas absorption gas chamber eliminate optical devices such as optical collimators or high reflection mirrors in the traditional gas chamber, which not only helps to reduce the noise of the optical path, but also realizes low-cost, high-sensitivity, multi-component simultaneous detection , continuous real-time monitoring, etc.

[0037] The technical scheme adopted in the present invention is: use differential optical absorption spectrometry, that is, DOAS system, to measure the absorption peak of acetylene and ammonia mixed gas, and then calculate the mixed concentration of acetylene and ammonia. The basic measuring principle of DOAS system among the present invention is: when a beam intensity is I 0 (λ) light, after passing through the measured gas with an optical path of L (unit: cm), its intensity bec...

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Abstract

The invention relates to the technical field of photonic crystal fiber sensing, and provides an indoor air quality detecting system having the advantages of small detection range, large flexibility and low cost. A technical scheme adopted in the invention is characterized in that a photonic crystal fiber based mixed gas concentration detecting apparatus is composed of a laser, a single-mode fiber, a coupler, a power meter, an air chamber and a wave meter, and a photonic crystal fiber is wound in the air chamber; the single-mode fiber and the photonic crystal fiber are directly connected in the air chamber by adopting a flange disc, the air chamber is filled with a mixed gas for detection, and the mixed gas goes through the end surface of the photonic crystal fiber in the air chamber, and enters a fiber core air hole area; laser output by the laser is divided into two beams by the coupler, and one of the two beams directly enters the wave meter as reference light; and the other one of the two beams goes through the single-mode fiber, enters the air chamber, interacts with the mixed gas in the hollow core of the photonic crystal fiber, is coupled into the other segment of the single-mode fiber, and is connected to the power meter. The system and the apparatus are mainly used for the gas detection.

Description

technical field [0001] The present invention relates to optical fiber sensing, in particular to photonic crystal optical fiber sensing, in particular to the detection of mixed gas concentration based on photonic crystal optical fiber, that is, the mixed gas concentration detection system based on photonic crystal optical fiber. technical background [0002] The detection of gas concentration is used in many fields. For example, in the following areas, the detection of gas concentration plays an important role: [0003] 1) In terms of environmental protection, large-scale industrial industries will emit a large amount of waste gas and produce toxic and harmful gases. CO 2 Exceeding emission standards lead to disasters such as the greenhouse effect. The leakage of refrigerant seriously damages the ozone layer, causing people to be exposed to the strong ultraviolet rays of the sun, thus endangering people's health, SO 2 , CO and other oxides directly endanger the health of ...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 陆颖郝丛静姚建铨
Owner TIANJIN UNIV
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