Analysis of the peculiarities of using multielement photodetector devices for registration of infrared spectra

Abstract

Analysis of the main peculiarities of using multielement photodetector devices (MEPD) in the composition of an IR spectrograph with a diffraction grating monochromator. The following can be referred to such peculiarities: nonlinear wavelength distribution over a photodetector device, differences in geometrical shift of beams in a cryostat window and differences interference lengths for each beam. It is shown with an example of the concrete device that deviation from the linearity at MEPD edges in the operation wavelength range reaches the value of the wavelength range coming for two elements; the geometrical shift difference ±25 mm, the change of interference length being +3 and -4 mm.