基于数字反馈稳频的激光瓦斯遥测技术

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.

参考文献

[1] 阚瑞峰, 刘文清, 张玉钧等. 基于可调谐激光吸收光谱的大气甲烷监测仪［J］. 光学学报, 2006, 26(1): 67～70

Kan Ruifeng, Liu Wenqing, Zhang Yujun et al.. Infrared absorption spectrometer of monitoring ambient methane［J］. Acta Optica Sinica, 2006, 26(1): 67～70

[2] W. Johnstone, A. J. McGettrick, K. Duffin et al.. Tunable diode laser spectroscopy for industrial process applications: system characterization in conventional and new approaches［J］. IEEE Sensors Journal, 2008, 8(7): 1079～1088

[3] L. C. Philippe, R. K. Hanson. Laser diode wavelength-modulation spectroscopy for simultaneous measurement of temperature, pressure, and velocity in shock-heated oxygen flows［J］. Appl. Opt., 1993, 32(30): 6090～6103

[4] K. Duffin, A. J. McGettrick, W. Johnstone et al.. Tunable diode-laser spectroscopy with wavelength modulation: a calibration-free approach to the recovery of absolute gas absorption line shapes［J］. J. Lightwave Technol., 2007, 25(10): 3114～3125

[5] P. Kluczynski, J. Gustafsson, . M. Lindberg et al.. Wavelength modulated absorption spectrometry—an extensive scrutiny of the generation of signals［J］. Spectrochim. Acta Part B, 2001, 56(8): 1277～1354

[6] J. Reid, D. Labrie. Second-harmonic detection with tunable diode lasers—comparison of experiment and theory［J］. Appl. Phys. B, 1981, 26(3): 203～210

[7] 汪磊, 谈图, 王贵师等. 天然气管道泄漏激光遥感探测系统的研制及标定方法［J］. 中国激光, 2010, 37(11): 2912～2917

Wang Lei, Tan Tu, Wang Guishi et al.. Natural gas pipeline leak detection system for laser remote sensing and calibration［J］. Chinese J. Lasers, 2010, 37(11): 2912～2917

[8] K. Uehara, H. Tai. Remote detection of methane with a 1.66 μm diode laser［J］. Appl. Opt., 1992, 31(6): 809～814

[9] 王贵师, 蔡廷栋, 汪磊等. 基于数字频率锁定技术实时探测实际大气中甲烷浓度［J］. 中国激光, 2011, 38(10): 1008002

Wang Guishi, Cai Tingdong, Wang Lei et al.. Application of digital frequency locking techniques in real-time measurement of methane in atmosphere［J］. Chinese J. Lasers, 2011, 38(10): 1008002

[10] 董磊, 马维光, 尹王保等. 基于LabVIEW的外腔二极管激光器稳频实验［J］. 光电子·激光, 2005, 16(3): 255～258

Dong Lei, Ma Weiguang, Yin Wangbao et al.. Frequency stabilization of an external cavity diode laser based on LabVIEW［J］. J. Optoelectronics·Laser, 2005, 16(3): 255～258

[11] J. S. Margolis. Measured line positions and strengths of methane between 5500 and 6180 cm-1［J］. Appl. Opt., 1988, 27(19): 4038～4050

[12] T. Iseki, H. Tai, K. Kimura. A portable remote methane sensor using a tunable diode laser［J］. Meas. Sci. Technol., 2000, 11(6): 594～602

[13] T. Iseki. Calculation of the ratio between the second and first harmonic signals in wavelength-modulation spectroscopy for absorption measurement［J］. Opt. Rev., 2003, 10(1): 24～30

[14] 贺志刚, 邓伦华, 王贵师等. 基于数字反馈控制的Nd:YAG激光器频率稳定技术［J］. 中国激光, 2012, 39(7): 0702009

He Zhigang, Deng Lunhua, Wang Guishi et al.. Nd:YAG laser frequency stabilization technology based on digital feedback control［J］. Chinese J. Lasers, 2012, 39(7): 0702009

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.

基于数字反馈稳频的激光瓦斯遥测技术

关于本站 Cookie 的使用提示

全站搜索

基于数字反馈稳频的激光瓦斯遥测技术

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索