基于拟合的吸收光谱反演算法研究*

可调谐半导体吸收光谱技术作为一种先进的光谱检测手段,已广泛应用于大气环境监测、工业过程控制等领域,实现不同领域组分浓度、温度、压力等参数的高精度探测。技术分为直接吸收光谱技术和波长调制光谱技术,通过选取不同的目标函数,验证拟合算法在吸收光谱技术中的可行性,两种技术均可通过构建合适的目标函数结合拟合算法实现吸收信息的精确反演,依据物理过程建立吸收模型,分别将直接吸收技术的光强、吸光度及透过率和波长调制光谱技术的光强及谐波信号作为拟合对象,实现了拟合参数的精确计算,从理论上验证了处理方法的准确性,扩展了拟合算法在检测仪器开发方面的应用,为各领域的发展提供了技术保障。

Research on inversion algorithm of absorption spectrum based on fitting

Tunable diode laser absorption spectroscopy as an advanced spectral detection method, and it has been widely used in atmospheric environment monitoring, industrial process control, etc. It can realize high-precision detection of component concentration, temperature, pressure and other parameters in different fields. The technology is divided into direct absorption and wavelength modulation spectroscopy technology, by selecting different objective functions, this paper verifies the feasibility of the fitting method in absorption spectrum technology. Both technologies can achieve accurate inversion of absorption information by constructing a suitable target function in combination with a fitting algorithm. The absorption model is established according to the physical process, and the intensity, absorbance and transmittance of the direct absorption technology, the light intensity and harmonic signal of the wavelength modulation spectroscopy technology are fitted as objects. The accurate calculation of the fitting parameters is realized, the accuracy of the processing method is verified theoretically, the application of the fitting algorithm in the development of testing instruments is expanded, and technical guarantee is provided for the development of various fields.