Optical position sensor

Details Optical position sensor Optical position sensor

1976-05-10

1978-08-22

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 250209, G01D 534

Patent

active

041091477

ABSTRACT:
A transducer for converting position displacement into a digital output signal correlated to the current placement state. An opaque vane is operably movable transversely in a radiation path between a radiation source and two juxtaposed radiation sensitive diodes. Discrete signals, emitted by each of the diodes in relation to the amount of their respective surface areas exposed to radiation, are converted by logic and a dual slope integrating analog-to-digital converter to a useful digital output signal. In one embodiment, both diodes are subject to having exposed radiation interrupted by the vane. Logic supplies the difference of the diode signals to the converter as its measured input while a sum signal is supplied thereto as its reference input. The ratio of input signals is then emitted by the converter as an output signal indicative of the current placement state. In another embodiment, only one diode is subject to having radiation interrupted by the vane and its signal comprises the measured input to the converter while the other diode signal comprises the reference input.

REFERENCES:
patent: 3316547 (1967-04-01), Ammann
patent: 3730633 (1973-05-01), Kennedy
patent: 3742233 (1973-06-01), Gorgens et al.
patent: 3768311 (1973-10-01), Gorgens et al.
patent: 3788795 (1974-01-01), Zeitlin

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