Visible-to-infrared image converter for dynamic infrared target simulation applications

J. Grinberg, U. Efron, M. J. Little, W. P. Bleha

Research output: Contribution to journalConference articlepeer-review

10 Scopus citations


A visible-to-infrared image converter based on the Hughes 2-in. liquid-crystal light valve1 is under development at Hughes Research Laboratories. The system is designed to operate in the 2- to 5-μm and 8- to 12-μm spectral ranges. The device consists of an IR-visible transparent input substrate electrode; an IR-transparent, visible-sensitive photoconductor (CdS); and a thin layer of liquid crystal acting as the light modulator medium. The readout window is transparent in the IR range used. The required IR dynamic scenery, generated for convenience in a visible form (e.g., on a CRT), is projected onto the input window, thus activating the photoconductor. This spatial voltage pattern of the required image is transferred to the liquid crystal, thus converting the image to a birefringent spatial modulation. The polarized infrared readout beam projected through the light valve is modulated as it passes through the liquid crystal. The latter operates in the 90° twisted nematic mode. The required IR scenery is then formed as the polarization-modulated IR beam passes a 90° cross-polarizer. The device offers the advantages of (1) maximum flexibility in presenting versatile dynamic IR sceneries and (2) high resolution and contrast. Good performance was demonstrated by a device operating in the 2- to 5-μm range. The proposed approach strongly benefits from the technology that has been developed for the visible-to-visible liquid-crystal light valve over the last few years.

Original languageEnglish
Pages (from-to)129-132
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 24 Jun 1980
Externally publishedYes
EventInfrared Imaging Systems Technology 1980 - Washington, United States
Duration: 8 Apr 198011 Apr 1980

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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