高电压技术2018，Vol.44Issue(5)：1605-1611,7.DOI:10.13336/j.1003-6520.hve.20180211003
基于有源气室结构的光声光谱技术
Photoacoustic Spectroscopy Technology Based on Active Photoacoustic Cell
摘要
Abstract
An on-line monitoring system of dissolved gas in transformer oil which is based on photoacoustic spectroscopy has disadvantages of photoacoustic pool huge volume, complex light calibration process, and chopper modulation technology affecting stability problem. Consequently, we proposed a photoacoustic spectroscopy based on active air chamber structure, built the active air chamber structure of photoacoustic spectrum detection experiment device, the active air chamber photoacoustic pool, resonance tube, a microphone, photoelectric detector for integration design. Moreover, the experimental devices were employed to measure different volume fraction of C2H2, CH4 and CO gas. The results of experiments and field operation show that three kinds of the photoacoustic signal of the gas and gas volume fraction under test between linear fitting degree can reach 0.998 9, 0.999 9, and 0.998 4, respectively, and the gas volume fraction detection threshold can reach 0.5×10-6, the average measurement error ＜2％. The photoacoustic spectroscopy based on active gas chamber is used to reduce the influence of optical collimation, simplify the light source calibration process and improve the intensity of the light source. At the same time, combined with wavelength digital modulation method, the use of mechanical chopper is avoided, the miniaturization of the optical acoustic detection system is realized, and the measurement accuracy and operation stability are improved. The theoretical and experimental results provide technical support and reference for engineering applications of the optical acoustic spectrum online monitoring system.关键词
变压器/溶解气体分析/有源气室结构/分布反馈式激光器/光声光谱/纵向共振光声池Key words
transformer/dissolved gases analysis/active photoacoustic call/distributed-feedback laser/photoacoustic spectroscopy/longitudinal resonant photoacoustic引用本文复制引用
李志军,陈伟根,邓硕,曹玲燕,万福,张建学..基于有源气室结构的光声光谱技术[J].高电压技术,2018,44(5):1605-1611,7.基金项目
国家自然科学基金(61605020 （）
U1766217) （）
重庆市基础与前沿研究计划(cstc2016jcyjA0427).Project supported by National Natural Science Foundation of China (61605020, U1766217), Chongqing Foundation and Frontier Research Program of China(cstc2016jcyjA0427). （cstc2016jcyjA0427）
