摘要
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-比尔定律的指数关系,会造成较大的误差,甚至错误的结果。在不改变气体吸收路径长度,保证检测灵敏度的前提下,采用分段线性插值和谐波分析的方法,将浓度区间范围为0～100%的气体,每隔10%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 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.
出处
《激光与红外》
CAS
CSCD
北大核心
2008年第5期462-464,共3页
Laser & Infrared
关键词
可调谐激光光谱
浓度检测
分段线性插值
谐波分析
tunable laser spectroscopy
concentration detection
piecewise linear interpolation
harmonic analysis
