可调谐半导体激光吸收光谱式甲烷传感器温度补偿技术

随着可调谐半导体激光吸收光谱气体传感技术的发展，基于该技术的矿用甲烷传感器成为当前煤矿瓦斯监测领域的研究热点，相关产品已陆续投入煤矿现场应用，由于煤矿应用环境的复杂性，传感器测量准确性受环境温度的影响较大。针对这一问题，提出了一种基于分段插值和重心插值的自适应融合的迭代补偿算法，该方法首先取标定温度下浓度的值，计算传感器测量温度影响率，然后求出重心拉格朗日插值的不同温度下的插值函数，在此基础上再对被测浓度甲烷值进行分段插值得到新补偿温度影响率，由该新的补偿温度影响率得到补偿后的甲烷值，依此实现自适应的迭代对激光吸收光谱气体测试数据进行补偿，并进行了大量相关实验验证，在高瓦斯情况下，测量误差减小到1%，在低浓度瓦斯情况下，测量误差减小到0.01%；工程应用结果表明该补偿技术的应用有效的减小了传感器甲烷浓度测量的误差，为激光传感器在煤矿现场的正常运行提供可靠保障。

Technology temperature compensation technology of the methane sensor with tunable semiconductor laser spectrum absorption

With the development of gas detection technology with tunable semiconductor laser absorption spectrum，the sensor based on this technology is the current focusing area for coal mine methane monitor study.Now the sensor has already used in coal mine，but the influence of ambient temperature to measurement accuracy is large.To overcome this problem，an adaptive iterative compensation algorithm was proposed which is a piecewise interpolation fused with the Lagrange barycentric interpolation.Firstly，the influence rate of measurement temperature was calculated based on the sensor calibration value.Secondly，the barycentric interpolation function was calculated under different temperatures.Then the new influence rate of measurement temperature was calculated to measure the methane concentration values.The authors got the compensation methane value by this new rate of temperature affect，according to the implementation of adaptive iteration.A lot of tests show that the measurement error is reduced to 1% in the high concentration gas conditions，the measurement error is reduced to 0.01% in the low concentration gas conditions.The engineering applications show that the measurement error decreases significantly.This method provides a reliable guarantee for the laser sensor used in coal mine.