18 August 2009 A portable solid-state high-spectral resolution hyperspectral imager
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Abstract
An imager based upon an etched liquid-crystal Fabry-Perot (LCFP) dispersive element is able to simultaneously sample four distinct resolution elements in the region 800 nm - 1100 nm, and tune in milliseconds to any one of 30,661 possible four-color scene images with a spectral resolution of 0.67 nm. Independently tunable quadrants of a single LCFP etalon are created by etching a transparent conducting layer on the etalon substrate, and one image from each quadrant is formed on a focal-plane array detector. Designed to weigh less than 20 lbs. in production, the portable, solid-state camera system is designed to provide fast RGB images of transient spectral phenomena, but many applications are possible. The fourth image in each four-element image is intended to be a background channel for contrast enhancement in bright background environments. The LCFP hyperspectral imager provides high-spectral resolution, allowing detection of short-lifetime atomic spectral line emissions characteristic of excited or ablating constituents against a bright, broadband, greybody background. High luminosity via the characteristic Fabry-Perot étendue advantage and an f/0.9 optical system accommodate the tactical need for a lightweight device with a small footprint. The LCFP dispersive element is tuned with battery-pack power, 0- 10V DC and mA current. The LCFP hyperspectral technology is easily adapted to Doppler imaging by enhancing the etalon gap and sampling over a narrower instrument passband. Operation in the MWIR and LWIR is also possible. The camera design creates multi-spectral images with a small but simultaneously sampled data-cube of narrow bandwidth.
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J. Noto, J. Noto, S. Watchorn, S. Watchorn, R. B. Kerr, R. B. Kerr, J. Riccobono, J. Riccobono, M. A. Migliozzi, M. A. Migliozzi, J. L. Semeter, J. L. Semeter, } "A portable solid-state high-spectral resolution hyperspectral imager", Proc. SPIE 7457, Imaging Spectrometry XIV, 74570N (18 August 2009); doi: 10.1117/12.826298; https://doi.org/10.1117/12.826298
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