Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-07-20
1994-12-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250361C, 422 52, G01N 2176
Patent
active
053713508
ABSTRACT:
An electronic device for measuring extremely faint light emissions comprises a photomultiplier tube surrounded by a sleeve made of a material which is a good heat conductor, cooled to a low temperature and insulated from the outside, a thermally insulating and optically transparent lightguide body being stably glued to the photocathode of the photomultiplier tube to receive the light radiation emitted by a specimen to be examined, which is inserted in a cavity of a supporting structure holding a rotary body which can be turned in front of the lightguide body, so as to operate as a shutter for the lightguide in a first turned measurement position thereof to allow measurement of the dark signal and then allow, as the rotary body and the specimen held therein are turned to a second measurement position, to measure the light emission from the specimen.
REFERENCES:
patent: 3659100 (1972-04-01), Anderson et al.
patent: 3871767 (1975-03-01), Holm-Hansen et al.
patent: 4099920 (1978-07-01), Heiss
patent: 4213703 (1980-07-01), Haunold et al.
patent: 4818883 (1989-04-01), Anderson et al.
patent: 5223218 (1993-06-01), Fukuoka et al.
Allen Stephone B.
Josif Albert
Modiano Guido
Nelms David C.
O"Byrne Daniel
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