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

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 ...

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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 life safety

However, the application research of DOAS technology in the field of indoor air quality detection is rarely mentioned.

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