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为检测变压器油中溶解气体种类和含量,研制了一种红外激光气体传感器,介绍了相关检测原理和系统构成。该传感器有一种基于串联反射镜组的透射式吸收气室,在气室体积不变的前提下可增加吸收光程,以获得更高的检测灵敏度。以变压器油中溶解气体乙炔为研究对象,选择乙炔气体在1 529.16nm处的吸收谱线作为其峰值特征吸收谱线,并基于最小二乘法对乙炔气体体积分数进行定量分析。实验结果表明:当注入电流为100mA、温度为26°C时,激光器的输出波长为1 529.14nm,光强透射率稳定在88%,能够满足信号处理系统的要求。在一定乙炔气体体积分数范围内,传感器的吸光度与乙炔气体体积分数之间具有良好的线性关系,检测限为10-5。因此所研制的红外激光气体传感器能够有效检测变压器油中的乙炔。
In order to detect the type and content of dissolved gas in transformer oil, an infrared laser gas sensor was developed. The relevant detection principle and system constitution were introduced. The sensor has a transmissive absorption chamber based on a tandem mirror set, which increases the absorption optical path without changing the volume of the chamber to achieve higher detection sensitivity. In this paper, acetylene gas is taken as the peak characteristic absorption line at 1 529.16 nm, and the acetylene gas volume fraction is quantitatively analyzed based on the least square method. Experimental results show that when the injection current is 100mA and the temperature is 26 ° C, the laser output wavelength is 1 529.14nm and the light transmittance is stable at 88%, which can meet the requirements of signal processing system. Within a certain range of acetylene gas volume fraction, there is a good linear relationship between the absorbance of the sensor and the volume fraction of acetylene gas with the detection limit of 10-5. Therefore, the developed infrared laser gas sensor can effectively detect acetylene in transformer oil.