基于宽频光源-FP腔的大气CO2检测系统误差分析

介绍了由宽频光源和法布里-珀罗 (Fabry-Pérot, FP)谐振腔组成的CO₂检测系统。结合常见的主动光学系统误差分析方法，对系统的各个误差项进行了定量化分析。系统误差来源于光源能量波动、环形器串扰、FP腔谱线变动和探测器噪声四个方面。通过建模计算了各独立误差项对差分信号数值的影响，确定了4项主要的系统误差。传统大气检测误差分析将硬件系统误差直接关联到浓度数据上，本文误差分析方法把硬件误差和反演算法误差剥离，对于提高系统的工作能力有更好的指导意义。

Error Analysis of CO2 Detection Based on Broadband Light Source and FP Cavity

A CO₂ detection system based on a broadband light source and a Fabry-Pérot resonant cavity is presented. By combining with other active optical system error analysis methods, the error terms of the system are quantitatively analyzed. The main error source of the system includes four parts: the energy fluctuation of the light source, the crosstalk of the circulator, the change of the FP cavity spectral line and the noise of the detector. By modeling and calculating the influences of independent error items on the difference signal value, four main systematic errors are determined. In the error analysis of traditional atmospheric detection, the hardware system error is related directly to the concentration data. Instead, in the error analysis proposed, the hardware error and the inversion algorithm error are stripped. This method is of better guiding significance to the improvement of system operation ability.