Devices for measuring parameters which can modify the charge of

Details Devices for measuring parameters which can modify the charge of Devices for measuring parameters which can modify the charge of

1980-04-22

1982-10-19

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250388, G01T 118

Patent

active

043552358

ABSTRACT:
The invention relates to a device for measuring irradiation capable of modifying the charge of an electret. It is arranged in a portable cassette, between two electrodes held separated by a part and connected to a measuring circuit. A conductive shutter is movable parallel to itself and to the electret between this electret and than electrode, so as to alternately mask this electret with respect to this electrode and to render the electret visible to the electrode. The measurement exploits differences in charge of the electret read according to the movements of the shutter.

REFERENCES:
patent: 2668245 (1954-02-01), Rich
patent: 2753463 (1956-07-01), Stout et al.
patent: 2967243 (1961-01-01), Weller
patent: 3436542 (1969-04-01), Ganouna-Cohen
patent: 4207471 (1980-06-01), Coover
patent: 4227086 (1980-10-01), Dreyfus et al.

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