检测天然气中H2S气体浓度的光子带隙光纤传感器

Hollow-core photonic bandgap fiber sensor for detection of H2S concentration in natural gas

摘要:

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H₂S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H₂S和CO₂气体进行了检测,结果表明,系统响应时间为53s, 测量灵敏度可达2×10－6 mol/L。

Abstract:

Detection and monitoring of H₂S are extremely important,since levels above 10ppm are considered to be hazardous.Based on differential absorption,a kind of optical fi ber gas sensor with high stability and sensitivity is proposed to detect H₂S mixed in natural gas. This sensor is advantageous for eliminating the instability of light source and the impact of t hermal zero drift and zero shift of photoelectric device.The gas sensing probe of the configuration uses f our shorter pieces of hollow-core photonic bandgap fibers (HC-PBFs) with the same overall length ins tead of one long piece of HC-PBF to improve the system response.By analyzing the experimental d ata of different concentrations of H₂S and CO_2absorption,the detection results of the protot ype are as follows:the response time of sensor is 53s,and the sensitivity is 2×10－6 mol/L.