中文摘要：

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，9h内激光器波长的长期漂移小于1．2pm，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。

英文摘要：

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.