Self-monitoring optical sensor having a ratiometric output signa

Details Self-monitoring optical sensor having a ratiometric output signa Self-monitoring optical sensor having a ratiometric output signa

1988-10-20

1990-08-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022711, 2502311, G01J 350

Patent

active

049470361

ABSTRACT:
An optical apparatus for measuring physical quantities, comprising an optical transducer (33) for sensing position, outgoing and return optical fibers (20,23), and an electronic control module (43). Light is generated at the control module and is transmitted by the outgoing optical fiber (20) to the optical transducer (33), which simultaneously varies the relative intensities of two different colors in a dissimilar manner in response to location of a positionable device (34,35) in the optical transducer. The modified intensity is transmitted back to the control module via the return optical fiber (23). The control module (43) measures the intensities of the two returning colors, and then outputs an electrical signal proportional to the intensity ratio for analog applications, or, alternatively, tests the intensity ratio against preselected constants and outputs discrete signals for digital application. The control module can, in addition, incorporate self-monitoring means to determine whether the optical components are functional.

REFERENCES:
patent: 4560868 (1985-12-01), Brogardh et al.
patent: 4596925 (1986-06-01), Gilby
patent: 4703175 (1987-10-01), Salour et al.
patent: 4743119 (1988-05-01), Ida
patent: 4761551 (1988-08-01), Edwards et al.
patent: 4774407 (1988-09-01), Erbe

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