基于中红外可调谐激光光谱技术的SO_(2)检测

Detection of SO_(2) Based on Mid-infrared Tunable Laser Spectroscopy

在气体绝缘组合电器内发生绝缘缺陷时,设备内部SF_(6)气体可能发生分解生成分解产物导致绝缘与灭弧性能下降。针对SF_(6)分解产物的检测对设备内部绝缘情况的检测与评估具有重要意义。SO_(2)作为SF_(6)分解产物中主要产物之一,对其准确检测有助于评估设备内部绝缘情况。文中基于中红外可调谐激光光谱技术搭建了SO_(2)检测实验平台,针对不同体积分数SO_(2)气体进行检测,获得SO_(2)体积分数与二次谐波峰值平均值的线性关系,并进一步开展了误差分析实验。分析了装置的响应速度与恢复时间。实验结果表明,SO_(2)体积分数与二次谐波峰值平均值具有较好的线性关系,其拟合优度为0.987。不同体积分数SO_(2)实验气体验证拟合曲线最大误差为4.86%装置响应速度与恢复时间为202.2 s与49.4 s。在CO干扰下,SO_(2)体积分数与二次谐波峰值平均值的线性拟合优度达到0.981。研究成果为微量SO_(2)的有效检测提供了技术参考与支持。

When the insulation defect occurs in the gas-insulated combined electrical appliance,the SF_(6) gas may decompose to generate the decomposition products inside the device.It will cause the degradation of insulation and arc extinguishing performance.The detection of SF_(6) decomposition products is of great significance to detect and evaluate the internal insulation of the equipment.SO_(2) is one of the main products in the decomposition products of SF_(6),and the accurate detection of SO_(2) is helpful to evaluate the internal insulation of the equipment.An experimental platform for SO_(2) detection is built by the mid-infrared tunable laser spectroscopy in this paper.The linear relationship between the SO_(2) concentration and the average value of the second harmonic peak is obtained by detecting the SO_(2) gas with different concentrations,and the experiment of error analysis is further carried out.The response speed and recovery time of the device are analyzed.The experimental results show that the SO_(2) concentration has a good linear relationship with the average value of the second harmonic peak value.The goodness of fit is 0.987.The fitting curve is verified by the different concentrations of SO_(2) gas,and the maximum error is 4.86%.The response speed and recovery time of the device are 202.2 s and 49.4 s.The fit of the SO_(2) concentration to the average of the second harmonic peak is 0.981 under CO interference.The results of the research provide technical reference and support for the effective detection of trace SO_(2).