Refraction correction for axisymmetric viewing window

Details Refraction correction for axisymmetric viewing window Refraction correction for axisymmetric viewing window

1991-09-23

1993-06-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356121, G01J 120

Patent

active

052201597

ABSTRACT:
An axisymmetric dome (28) located between a radiation emitting target (14) and a radiation sensor (10) has an outer surface area (33) where a principal ray (16) from the target (14) impinges on the dome (28) that is parallel to the dome inner surface area (31) where the principal ray leaves the dome. This dome construction reduces image aberration in the pitch plane (Y, Z'). For correction aberration in the roll plane, a focusing reflector (31) is constructed of a piezo-electric plate (32) with a plurality of spaced apart electrodes (38) on its non-reflective surface, which reflector (31) reflects radiation from the target (14) onto a secondary reflector (20) which, in turn, reflects the radiation onto the sensor (10). Selective electrical energization of the electrodes (38) modifies the reflector (31) shape to correct roll plane aberration.

REFERENCES:
patent: 4016415 (1977-04-01), O'Meara
patent: 4231534 (1980-11-01), Lintell et al.
patent: 4864137 (1989-09-01), Klein

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