Optical mask filter capable of reducing the semiperiodic compone

Details Optical mask filter capable of reducing the semiperiodic compone Optical mask filter capable of reducing the semiperiodic compone

1990-03-30

1991-10-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022729, H01J 4014

Patent

active

050597841

ABSTRACT:
A mask for reducing a semiperiodic variation of an output signal produced in response to a semiperiodic temporal variation of a distribution of radiation incident on the input of a detector. The mask can have a transmitance that changes abruptly at an outer profile of an opaque region or can have a varation in transmittance that varies continuously.

REFERENCES:
patent: 4245154 (1981-01-01), Uehara et al.
patent: 4247202 (1981-01-01), Failes
patent: 4314760 (1982-02-01), Hodge et al.
Paper by Manush Birang and Ian Latchford Presented at the SPIE Applications of Optical Engineering Conference held on Oct. 12 & 13, 1989.

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