Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-11-08
1978-06-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, G01D 534
Patent
active
040963837
ABSTRACT:
Apparatus for converting the revolutions of a shaft into pulses including a disc having devices such as slots or reflectors radially spaced around its periphery and light-transmitting and light-receiving fiber optic cables aligned for sensing the devices as the disc rotates. A light source, such as a light-emitting diode, is positioned at the outer end of a light-transmitting cable for providing light, and at least one phototransistor at the outer end of a light-receiving cable converts the light signals into electric pulses. Preferably, the light-transmitting and light-receiving cables are paired, giving successive signals as a slot or reflector is sensed for activating a counting circuit. A single light-transmitting cable is preferably split near the disc to provide two light sources from a single light-emitting diode. The apparatus has special utility in the atmosphere of a gasoline pump, or other metering device, requiring intrinsic safety in that the fiber optic cables convey light signals developed within the potentially explosive area to electric circuitry safely barriered from exposure to explosive gases.
REFERENCES:
patent: 3283409 (1966-11-01), Rothe et al.
patent: 3539777 (1970-11-01), Rohland
patent: 3622793 (1971-11-01), Dalton et al.
patent: 3814934 (1974-06-01), Mesh et al.
patent: 3999074 (1976-12-01), Callaghan
Mancini Ronald Alfred
Thomson Douglas Kile
Gilbert & Barker Manufacturing Company
Nelms David C.
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