Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-04-26
1984-12-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, 73728, 455612, G02B 514
Patent
active
044906064
ABSTRACT:
A transducer apparatus utilizing fiber optics for data transmission is disclosed in which an output optical signal is encoded with information representative of a parameter being measured and the encoded optical signal transmitted to a remote measurement and control apparatus site for decoding. The transducer is adapted to receive an input optical signal, and converts the input optical signal into electrical energy to power a driver. An electrical drive signal, generated by the driver, has a selectively variable frequency representative of the parameter being measured. Using the electrical drive signal, the output optical signal is generated. The driver includes a variable frequency oscillator whose frequency of oscillation is dependent upon the parameter being measured.
REFERENCES:
patent: 4156809 (1979-05-01), Phillips
patent: 4346478 (1982-08-01), Sichling
patent: 4417140 (1983-11-01), Adolfsson et al.
McGowan, "Multiple Pressure Transmitters Speak Digital on Two Wires", Control Engineering, Dec., 1979.
"Smoke Alarm uses Fiber Optics for Hazardous Areas" Electronic Design, Sep., 1981, p. 64.
Janecka Jerry F.
Lockett James F.
Smither Miles A.
Geosource Inc.
Nelms David C.
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