An elaborate Hadamard transform infrared imaging spectrometer system based on the digital mirror device (DMD) is proposed in this paper, through which the implementation of Hadamard coding in this system is revealed. Derivation of the process of spectra radiation transmission covers the influence factors of target radiative characteristics, atmospheric environment, optical system, dispersion, DMD modulation, spectrum response of detector, Hadamard encoding and decoding etc. A simple physical scene is introduced including diverse materials and model tank and simulation results are given by the transfer model with real-time meteorological data, real-time temperature data and imaging system parameters.
Due to the poor manufacturing process of MWIR diffraction grating, there are obvious non working level diffraction images in MWIR imaging spectrometer which uses Hadamard Transform to realize the snapshot staring imaging. When non working level and working level diffraction images overlap in space, it becomes impossible to extract the MWIR spectrum information of targets. To solve this problem, an absolute radiation calibration method based on Hadamard Transform is proposed. The blackbody and collimator are used as input to code, calibrate and decode the target spectrum information. Then, the MWIR spectrum curve of targets can be obtained after decoding. Compared with the theoretical spectrum curve of the target, the relative error is less than 1%. The influence of diffraction image aliasing on the system is eliminated, which proves the feasibility of this method.
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