Electromagnetic radiation detecting device with hollow semicylin

Details Electromagnetic radiation detecting device with hollow semicylin Electromagnetic radiation detecting device with hollow semicylin

1988-03-09

1989-10-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350273, 250350, G01D 536

Patent

active

048734330

ABSTRACT:
An electromagnetic radiation detecting device comprises at least one radion detector for detecting electromagnetic radiation from a hemisphere, a radiation-transparent protective hood covering the or each detector, and a rotary chopper to alternately shield the or each detector and associated hood from arriving radiation and to expose the detector and hood to such radiation. The chopper comprises a carrier disc, which is rotatable about an axis parallel to a radiation-receiving area of the or each detector, and at least one hollow semicylindrical shielding member fixed at the periphery of the disc and curved in the axial direction of the semicylindrical shape. The or each shielding member is movable on a circular path by the disc to alternately shield and reveal the hood covering the or each detector.

REFERENCES:
patent: 3390576 (1968-07-01), Yellott
patent: 3590259 (1971-06-01), Johnston et al.
patent: 3993901 (1976-11-01), Widmer

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