Optically coupled remote sensor apparatus and system

Details Optically coupled remote sensor apparatus and system Optically coupled remote sensor apparatus and system

1988-04-29

1990-02-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 455612, 73705, G01D 534

Patent

active

048990442

ABSTRACT:
An optically coupled remote sensor apparatus comprises a tuned circuit incorporating a sensor and a light emitting diode (LED) connected in parallel with the tuned circuit. The natural resonant frequency of the tuned circuit is determined by the sensor whose electrical parameter is a function of the condition to be sensed. The sensed condition correlates to a frequency of light pulses emitted from the LED, which light pulses are only emitted when the pulsed light source frequency coincides with the natural resonant frequency of the tuned circit.

REFERENCES:
patent: 4409476 (1983-10-01), Lofgren et al.
patent: 4417140 (1983-11-01), Adolfsson et al.
patent: 4490606 (1984-11-01), Lockett et al.
patent: 4538063 (1985-08-01), Bulat
patent: 4651571 (1987-03-01), McGlade
patent: 4743752 (1988-05-01), Olsen et al.
patent: 4752141 (1988-06-01), Sun et al.

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