检测天然气中H_2S气体浓度的光子带隙光纤传感器

Hollow-core photonic bandgap fiber sensor for detection of H_2S concentration in natural gas

为消除光源不稳定、光电器件的热零点漂移以及零点漂移对测量准确度的影响,基于差分吸收检测法,设计一种检测天然气中H_2S气体浓度的高稳定性、高灵敏度的光子带隙传感器。为提高系统响应,采用4段串联的空芯光子晶体光纤(HC-PBF)作为气体传感探头。对不同组分浓度的H_2S和CO_2气体进行了检测,结果表明,系统响应时间为53 s,测量灵敏度可达2×10^(-6)mol/L。

Abstract：Detection and monitoring of H2S are extremely important, since levels above 10 ppm are con- sidered to be hazardous. Based on differential absorption,a kind of optical fiber gas sensor with high sta bility and sensitivity is proposed to detect H2S mixed in natural gas. This sensor is advantageous for e- liminating the instability of light source and the impact of thermal zero drift and zero shift of photoelec- tric device. The gas sensing probe of the configuration uses four shorter pieces of hollow-core photonic bandgap fibers （H@PBFs） with the same overall length instead of one long piece of HCPBF to improve the system response. By analyzing the experimental data of different concentrations of H2 S and CO2 absorption,the detection results of the prototype are as follows：the response time of sensor is 53 s,and the sensitivity is 2×10 ^-6 mol/L.