Mr. Zhang R. Xia Profile

Zhang R. Xia

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Proceedings Article | 20 February 2009 Paper

Partial gating image intensifier based on liquid crystal auto-controlling light intensity

Ruixia Zhang, Yuanhe Tang

Proceedings Volume 7279, 72790T (2009) https://doi.org/10.1117/12.821435

KEYWORDS: Liquid crystals, Transmittance, Image intensifiers, Video, Computer simulations, LCDs, Refractive index, Molecules, Charge-coupled devices, Field programmable gate arrays

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In order to enlarge the dynamic range of image intensifier, and CCD can work normally under the strong light (105lx), based on the generation II image intensifier, we have brought forward an novel equipment of double lens optical system including a liquid crystal panel (twisted nematic liquid crystal panel LCX023-CMT) and a photometric CCD which detects the illuminance real-time. The light intensity is controlled by liquid crystal automatically and the partial gating can be realized. The principle of auto-controlling light intensity is introduced detailedly in this paper. And the transmittance of liquid crystal has been simulated. Experimental result displays that the optical transmittance changed from 1.28% to 25.60% with the gray levels from 0 to 250. The high linearity relation of transmittance to gray levels is obtained when the gray levels change from 90 to 220. The feasibility of partial light intensity auto-controlled by liquid crystal has been further proved by the two obvious contrast pictures that one is photographed with the liquid crystal panel and another without.

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