Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1975-04-14
1976-06-15
McGraw, Vincent P.
Optics: measuring and testing
Range or remote distance finding
With photodetection
250227, 250231SE, 250458, 250461B, 356188, G01J 330, G01J 348
Patent
active
039633519
ABSTRACT:
A multi-wavelength time-sharing apparatus usable in various different configurations of optical measuring equipment to provide a plurality of time-shared optical channels and including appropriate circuitry. The apparatus employs a turbine-driven filter wheel having a shaft position-encoding arrangement consisting of a hollow shaft portion which is internally illuminated. The hollow shaft portion has two sets of spaced apertures cyclically communicating with respective angularly spaced pairs of externally fixedly mounted phototransistors which are sequentially illuminated as the shaft portion rotates and which produce timing pulses which drive Schmitt triggers, which, in a typical embodiment, in turn produce pulses compatible with a logic circuit employed to decode the phototransistor signals into triggers for driving a 4-channel switched gain equalizer, a dark current clamp, and detector gates. Appropriate selection of the signals enables the instrument to function as a fluorometer or a spectrophotometer.
REFERENCES:
patent: 3374477 (1968-03-01), Ejiri et al.
patent: 3811777 (1974-05-01), Chance
patent: 3828173 (1974-08-01), Knepler
Chance Britton
Graham, Jr. Norman C.
Legallais Victor
Sorge John R.
Gordon Herman L.
McGraw Vincent P.
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