Sample detector

Details Sample detector Sample detector

1980-05-21

1982-08-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250548, G01D 2104

Patent

active

043439918

ABSTRACT:
A sample detector is comprised of a first group of optical fibers having exit end surfaces arranged in the direction perpendicular to the shifting direction of the carrier, a second group of optical fibers having entrance end surfaces arranged opposite said exit end surfaces of the first group of optical fibers, a plural number of light emitting diodes arranged in the vicinity of the entrance end surfaces of the first group of optical fibers, a single photo detector element arranged in the vicinity of the exit end surfaces of the second group of optical fibers and a preamplifier connected to the output side of said photo detector element. Said sample detector is adapted in such a manner that the light emitting diodes are caused to glow consecutively, the light, having passed through the first group of optical fibers the carrier and the second group of optical fibers, is received by said photo-detector element, subjected to photoelectric conversion and amplified by said preamplifier. The presence of samples on the carrier is detected based on the outputs thus obtained.

REFERENCES:
patent: 3786238 (1974-01-01), Heisner
patent: 4015122 (1977-03-01), Rubinstein

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