When we detect gas concentration by the technology of tunable laser spectroscopy,under the condition of high gas concentration and long gas absorption path,we can use simple linear relation as the approximation of the exponential relation of Lambert-Beer’s law,as a result,we will get big errors and wrong result.On the premise that we never change gas absorption path length and ensure detection sensitivity,we adopt the method of piecewise linear interpolation and harmonic analysis.By dividing some sub-range every 10% in the range of gas concentration and adopting different proportion factor in each subrange,we can get good curves approaching to theory′s and improve much detection precision by eliminating the effect of many factors,such as the fluctuations of the optical power.
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邓广福,刘光达,周志坚.提高可调谐激光光谱气体检测精度的研究[J].激光与红外,2008,38(5):462~464 DENG Guang-fu, LIU Guang-da, ZHOU Zhi-jian. Research on Improving Gas Detection Precision Based on Tunable Laser Spectroscopy[J]. LASER & INFRARED,2008,38(5):462~464