为了减小谱图的微缓形变对TDLAS气体分析仪精度的影响，提出一种传递复原方案.该方案通过比对校验气体的出厂校准谱图和现场测量谱图，得到其形变系数；由于校验气体与过程气体间拥有相同的形变机制，根据形变的传递性可将过程气体的实时谱图也复原到校准状态，从而维持分析仪的保真度.解决了动态过程气体谱图形变的复原问题，不需调节光学和电子系统硬件参数，通过信号滤波、特征提取、形变系数计算，使用拉格朗日插值公式或Sinc函数插值法复原.在仿真实验中，传递复原的谱图与校准谱图的相似度达到99.999%.实验采集不同程度形变的CO2气体谱图，采用拉格朗日插值复原算法的复原谱图与校准谱图的相似度达到99.9%.

In order to reduce the impact of the chronic spectral deformation on TDLAS gas analyzer accuracy, a transfer and restoration method was proposed. By comparing the real time spectra with the calibration spectra for validation gas, the deformation coefficient is obtained. The process gas spectra share the same deformation mechanism with the validation gas. So the process spectra can be restored to the calibration state due to deformation transitivity. Consequently analyzer maintains the original fidelity. It solves the tough issue of spectra restoration for dynamic process gas. It requires no adjustment of hardware parameters of optical or electronics system. The spectra are restored through signal filtering, feature extraction and deformation coefficients calculation. In the simulation, the similarity measure maintained 99.999% between calibration spectra and restorated real time spectra. For the experimentally acquired CO2 gas spectra with different levels of deformation, the similarity measure maintained 99.9% between target spectra and real time spectra with Lagrangian interpolation restoration.