可调谐半导体激光吸收光谱(TDLAS)技术是利用二极管激光器的波长调谐特性, 获得被选定的待测气体特征吸收线的吸收光谱, 从而对待测气体进行定性或定量分析。油中溶解气体分析是评估变压器绝缘状态和分析变压器绝缘故障的重要依据, 针对监测故障气体CO2和C2H2的需要, 将TDLAS技术与多次反射怀特池技术、谐波检测技术以及光开关的时分复用技术相结合, 设计了一套同时在线监测CO2和C2H2气体浓度的系统。该系统具有精度高、选择性强、响应速度快和本质防爆等优点, 适用于电力变压器故障气体的在线检测。

Tunable diode laser absorption spectroscopy (TDLAS) technique is a method to detect trace-gas qualitatively or quantificationally based on the scan characteristic of the diode laser used to obtain the absorption spectroscopy in the characteristic absorption region. The dissolved gas analysis (DGA) is essential for the insulation state assessment and the fault diagnosis of transformers. In order to monitor the fault gases CO2 and C2H2, a set of system of simultaneous online monitoring the concentrations of CO2 and C2H2 is designed, and this system makes use of TDLAS technique combined with multiple reflection pool, harmonic detection and time-division multiplexing optical switch technique. The system has benefits of high accuracy, selectivity, fast response and the nature of explosion-proof, which is suitable for power transformer fault gases on-line monitoring.