Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1979-09-28
1981-10-20
Groody, James J.
Communications: electrical
Continuously variable indicating
With particular transmitter
324 62, 34087026, 34087042, G08C 1904, G08C 1912
Patent
active
042964130
ABSTRACT:
A circuit for converting changes in a sensed physical parameter, such as resistance and resistance change as a function of pressure, temperature and the like, into a digital signal of proportional frequency. A sensor bridge, monitoring the parameter to be measured, forms a part of a feedback loop controlling a current into a resistance-capacitance integrator which is part of a controlled oscillator. The oscillator has automatic offset error correction. The frequency of the sensor-controlled is proportional to the unbalance in the sensor bridge. The converter receives power on a two-wire line from a power supply which may be located remotely therefrom, and from which power supply the sensed-parameter-established frequency is extracted for use by processing-control apparatus and the like.
REFERENCES:
patent: 3536997 (1970-10-01), Holt
patent: 3609728 (1971-09-01), Quinn et al.
patent: 3668673 (1972-06-01), Adler
patent: 3800300 (1974-03-01), Van Oosterhout
patent: 3898554 (1975-08-01), Knudsen
patent: 3955138 (1976-05-01), Milkovic
patent: 4015140 (1977-03-01), Milkovic
Davis James C.
General Electric Company
Groody James J.
Krauss Geoffrey H.
Snyder Marvin
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