中国激光, 2013, 40 (4): 0408002, 网络出版: 2013-03-05
基于数字反馈稳频的激光瓦斯遥测技术
Laser Methane Remote Sensing Technology Based on Digital Feedback Frequency Stabilization
激光技术 谐波稳频 波长调制光谱 瓦斯遥测 重复性 laser technique harmonic frequency stabilization wavelength modulated spectroscopy methane remote sensing repeatability
摘要
研制了一套基于数字反馈稳频的便携式瓦斯浓度遥测装置,采用电流和温度双重反馈稳频的策略抑制了激光器波长的长期漂移,同时也保证了光功率的长期稳定性。实验结果表明,9 h内激光器波长的长期漂移小于1.2 pm,光功率保持稳定,保证了瓦斯浓度的长期连续稳定的测量;不同距离下浓度测量值重复性较好,浓度波动小于5%,满足实际环境中(如天然气管道泄漏、煤矿等)瓦斯浓度测量需求。
Abstract
A portable methane remote sensor based on digital feedback frequency stabilization is developed. Current and temperature dual-feedback strategy suppresses the laser′s long-term wavelength drift; meanwhile it ensures the long-term stability of optical power. Experimental results show that the wavelength drift is less than 1.2 pm in 9 h, and the optical power also remains stable, which ensures the long-term continuous measurement stability of the concentration. Repeatability of concentration measurement value is stable in different detection distances, with a 5% fluctuation. Experimental results indicate that the instrument can be used in practical environment, such as natural gas tube leakage and coal mine.
孙延光, 董作人, 陈迪俊, 叶青, 蔡海文, 瞿荣辉, 龚尚庆. 基于数字反馈稳频的激光瓦斯遥测技术[J]. 中国激光, 2013, 40(4): 0408002. Sun Yanguang, Dong Zuoren, Chen Dijun, Ye Qing, Cai Haiwen, Qu Ronghui, Gong Shangqing. Laser Methane Remote Sensing Technology Based on Digital Feedback Frequency Stabilization[J]. Chinese Journal of Lasers, 2013, 40(4): 0408002.