摘要
阐述了变压器油中故障气体光纤检测的意义，分析了气体浓度二次和三次谐波检测与调制点的关系；提出了方波调制ＬＤ的非机械斩波时分－差分检测方法；
The harmonic detection of gas absorption with sine bias modulation is discussed. If the bias level is on the peak of the gas absorption line, the third harmonic does not change with the shift of the center wave length of the light source, and if the bias lvevel is on one side of the absorption line, the second harmonic is the best one that can be detected. A TDM DAT detecting method with square wave bias modulation is presented as another possible method of detecting the gas in very small quantities. Based on the discussion on harmonic and TDM DAT detection, several configurations and equations as well as the conditions for application to the detection of the case where there exist multiple gases are given.
出处
《华中理工大学学报》
CSCD
北大核心
1996年第10期36-39,共4页
Journal of Huazhong University of Science and Technology
基金
国家自然科学基金
关键词
变压器油
光纤传感器
谐波检测
多组分气体
检测
transformer oil
fiber optic sensor
harmonic detection
square wave bias modulation
TDM DAT
detection of gas with multiple constituents
