Characterization of SWIR Hyperspectral Imager with a Multispectral Polarized Scene Projector

摘要

Recently, the US Army developed a prototype shortwave infrared (SWIR) multispectral polarized scene projector (MPSP) system. This system is capable of projecting single spectral images as well as videos with full polarization content from 850 to 1650 nm with variable spectral bandwidth. The bandwidth can vary between 12 and 100 nm. A multistage liquid crystal tunable filter is used to tune the wavelength of light with desired bandwidth and three reflective 512x512 liquid crystal on silicon (LCoS) spatial light modulators (SLMs) with 37.5 μm pixel pitch are used to project an image with allStokes parameters. This scene projector is intended to characterize hardware-in-the loop spectral and polarization performance of spectropolarimetric imagers operating in the SWIR region. We used this projector to characterize a SWIR hyperspectral imager with a single polarization based on an acousto-optic tunable filter (AOTF). Here, we will briefly describe the scene projector and the hyperspectral imager, discuss the experimental setup and present the results of our characterization.