基于光声光谱峰面积的微量乙炔气体定量检测  

Quantum Detection of Trace Acetylene Gas Based on the Peak Area of Photoacoustic Spectroscopy

作　　者：张晓星[1] 刘恒[1] 张英 刘喆 李新[1] 

机构地区：[1]重庆大学输变电装备及系统安全与新技术国家重点实验室,重庆400030 [2]贵州电力试验研究院,贵阳550002

出　　处：《高电压技术》2015年第3期857-863,共7页High Voltage Engineering

基　　金：教育部新世纪优秀人才支持计划(NCET-12-0590);中央高校基本科研基金(0213005202042)~~

摘　　要：乙炔是区分电力变压器过热性和放电性故障的标志性气体,其含量对判断电力变压器内绝缘故障类型和严重程度具有重要意义。为此,采用分布反馈式半导体激光器搭建了基于光声光谱峰面积的微量乙炔气体定量检测平台,选择乙炔分子1 529.18 nm处的吸收谱线,试验研究了分布反馈式半导体激光器输出峰值波长的温度漂移特性和乙炔气体的光声光谱响应特性,获取了基于Lorentz线型拟合的不同体积分数标准乙炔气体的光声光谱响应特性曲线,并基于最小二乘法对特性曲线峰面积与乙炔气体体积分数之间的定量关系进行了研究。结果表明:在气体吸收未饱和的情况下,乙炔气体光声光谱峰面积与其体积分数之间存在良好的线性关系,该试验平台对乙炔气体的检测下限为0.46×10-6。该研究结果为变压器油中溶解气体的在线监测及电力变压器内绝缘故障诊断奠定了基础。Acetylene is a symbolic gas to distinguish transformer overheating and discharging faults, and its content has important significance in detecting the power transformer internal insulation fault type and severity. We set up a trace acetylene detection platform based on photoacoustic spectroscopy peak area using a distributed feedback diode laser. Absorption line of acetylene at 1 529.18 nm was selected for experimental study. The temperature drift characteristics of the distributed feedback laser diode and the photoacoustic spectroscopy response characteristics of trace acetylene were analyzed by experiments. The photoacoustic response characteristic curves of trace acetylene with different volume fraction based on Lorentz nonlinear fitting were obtained. The least squares linear regression was used to analyze the quantitative relationship between the photoacoustic spectroscopy peak area and the volume fraction of the acetylene. The experimental results show that when the gas absorption saturation effect does not occur, a good linear relationship exists between the acetylene gas photoacoustic spectroscopy peak area and volume fraction, and the trace acetylene detection limit of the test platform is 0.46×10^-6. This result laid the foundation for the online monitoring of dissolved gas in transformer oil and insulation fault diagnosis of power transformer.

关 键 词：微量乙炔 光声光谱 Lorentz线型 峰面积 最小二乘法 定量检测 

分 类 号：TM41[电气工程—电器]