Comparison and analysis of wavelength calibration methods for prism – Grating imaging spectrometer

To identify spectral information obtained from the prism - grating imaging spectrometer, it is essential to know the center wavelength for each spectral channel. In this letter, the wavelength calibration principle of push-broom imaging spectrometers is described, and a wavelength calibration device is built. The wavelength calibration of the self-developed prism-grating imaging spectrometer using the peak method and the gravity method is completed, and the center wavelength of each spectral channel is obtained by the two methods respectively. Compared with the peak method, the gravity method can effectively avoid the errors caused by the uneven light spot energy in the process of wavelength calibration, and can more effectively complete wavelength calibration. The two methods can meet the practical application and can be selected according to actual demand.