Real time pre-detection dynamic range compression

Details Real time pre-detection dynamic range compression Real time pre-detection dynamic range compression

1990-12-19

1992-07-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359241, H01J 314

Patent

active

051305305

ABSTRACT:
A real-time, pre-detection optical dynamic range compression system uses a photorefractive crystal, such as BaTiO.sub.3 or LiNbO.sub.3, in which light induced scattering from crystal inhomogeneities of the optical input occurs as a nonlinear function of the input intensity. The greater the intensity, the faster random interference gratings are created to scatter the incident light. The unscattered portion of the optical signal is therefore reduced in dynamic range over time. The amount or range of dynamic range compression may be controlled by adjusting the time of application of the unscattered crystal output to the photodetector with regard to the time of application of the optical input to the crystal.

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patent: 4016563 (1977-04-01), Pedinoff
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patent: 4772785 (1988-09-01), Cheng et al.
patent: 4915503 (1990-04-01), Pavlath

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