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利用可调谐激光光谱技术检测气体浓度时,在气体浓度较高或气体吸收路径较长的情况下,用简单的线性关系逼近朗伯一比尔定律的指数关系,会造成较大的误差,甚至错误的结果。在不改变气体吸收光路长度的前提下,采用分段线性插值和谐波分析的方法,将浓度范围为0～100%的气体,每隔5%划分为一个子区间,在各个子区间内采用不同的比例系数,从而可以很好地逼近理论曲线,并可以消除光强波动等因素的影响,大大提高系统的检测精度。
When using tunable laser spectroscopy to detect gas concentrations, approximating the exponential relationship of Lambert-Beer’s law with a simple linear relationship can result in large errors or even errors at higher gas concentrations or longer gas absorption paths the result of. Under the premise of not changing the length of gas absorption optical path, the method of piecewise linear interpolation and harmonic analysis is used to divide the gas with the concentration range of 0-100% into 5 sub-ranges every 5% Different scale factor, so that the theoretical curve can be well approximated, and the influence of light intensity fluctuation and other factors can be eliminated, thereby greatly improving the detection accuracy of the system.