干涉型光谱仪高精度光谱定标方法

干涉型光谱仪获取光谱的干涉数据信息，数据处理过程中将干涉信息进行一系列光谱复原，最终得到光谱信息数据。光谱定标处理是干涉型光谱仪光谱反演的重要环节，直接决定了光谱信息的可用性和准确度。介绍了干涉型光谱仪光谱定标的基本思路，并在此基础上提出了一种基于总光程差精确解算的光谱定标方法。由于干涉型光谱仪总光程差难以精确测量，而总光程差解算是光谱定标的核心和关键，基于此情况，提出了遍历总光程差，分析光谱漂移，最终确定干涉型光谱仪总光程差的总体思路。定标处理中将所有总光程差可能值带入光谱复原流程，进行光谱复原与分析，最终得到光谱漂移最小的总光程差，即为总光程差解算值。该方法可以精确解算干涉型光谱仪的总光程差，进而对干涉型光谱仪进行高精度光谱定标。同时介绍了详细、完整的光谱定标流程，最终得到干涉型光谱仪各个波段的中心波长值、波数分辨率等。最后设计了典型的干涉型光谱仪主要参数，并生成了该光谱仪的模拟干涉数据，利用该方法对模拟数据进行光谱定标，并对光谱定标结果进行了精度分析和验证，证明该方法波数分辨率定标精度优于0.000 25 cm-1。

High Precision Spectral Calibration Method of Fourier Interferometric Spectrometer

The Fourier interferometric spectrometer (FIS) acquires the interference data information of the spectrum and during the spectrum data processing, a series of spectrum reconstruction will be performed on the interference information to obtain the final spectrum information data. The spectral calibration is the key step to spectrum reconstruction of FIS, which directly determines accuracy and availability of the spectrum results. This paper introduces the basic ideas and calibration accuracy about the spectral calibration for the FIS and puts forward a new spectral calibration method based on calculating the precise value of the total optical path difference (TOPD). The TOPD of FIS is difficult to be precisely measured, but it is the core and key to the spectral calibration. In order to calculate the precise TOPD, this paper proposes the idea how to traverse the TOPD and analyzes the spectrum drift. During the calibration, all the possible values of the TOPD participate in the spectrum reconstruction flow to carry out spectrum recovery and analysis. Ultimately the TOPD with the minimum spectrum drift will be achieved, namely solution value of the TOPD. This method can accurately resolve the TOPD of the FIS and then calibrate the spectrum with high accuracy. In addition, the paper introduces the detailed and complete spectral calibration flow and obtains the center wavelength value of every band and wavenumber resolution. Moreover, the paper designs the main parameters of the typical FIS and generates its simulation interference data. Using the above method to calibrate the simulation data, the analysis and verification of the spectral calibration results proves that the calibration precision of wavenumber resolution achieves 0.000 25 cm-1 or above.