Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-08-04
1991-01-22
Nelms, Davis C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
35821316, H01J 4014
Patent
active
049872940
ABSTRACT:
An optical sensor comprises a plurality of light-sensitive members (10) each having an individually associated capacitor (11) which is charged with a current dependent upon the incident light sensed by the associated light-sensitive member (10); a light pulse source (12) providing light pulses from which the incident light is derived; and a control pulse source (14) providing pairs of consecutive pulses sandwiching the light pulses from the light pulse source (12), the first of which serves to discharge the capacitors (11) to a reference level prior to issue of a pulse by the light pulse source (12) and the second of which serves to effect read out from the capacitors (11) of the charge thereon deriving from the incident light from the preceding light pulse from the light pulse source (12), whereby the output of the sensor is not swamped by any stray charge on the capacitors (11).
REFERENCES:
patent: 4291338 (1981-09-01), Thomas
patent: 4623929 (1986-11-01), Johnson et al.
patent: 4716456 (1987-12-01), Hosaka
patent: 4717830 (1988-01-01), Botts
patent: 4783702 (1988-11-01), Sone et al.
patent: 4827145 (1989-05-01), Arques
Le Que Tan
Nelms Davis C.
Rosemount Limited
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