Polarization spectral imaging system based on four-phase modulation

The invention discloses a polarization spectral imaging system based on four-phase modulation. The polarization spectral imaging system is composed of a front telescopic system and a spectral polarization imaging system. After entering a slit through the front telescopic system, a light beam passes through a catadioptric lens, reaches an immersion grating for dispersion, then is reflected to the catadioptric lens, reaches a phase modulator, and reaches an area array detector after passing through the phase modulator. The phase modulator is formed by arranging four phase modulators in different directions in an array on the same plane, and the four phase modulators are respectively 0 degree, 45 degrees, 90 degrees and 135 degrees. The polarization spectral imaging system based on four-phase modulation can simultaneously acquire polarization, spectrum, space and other multivariate information of a measured target, does not have any mechanical moving part, effectively improves the target identification degree un