Apparatus for converting physical quantities

Details Apparatus for converting physical quantities Apparatus for converting physical quantities

1980-07-18

1983-06-28

Groody, James J.

Communications: electrical

Continuously variable indicating

With particular transmitter

323303, 34087039, 34087017, 34087043, G08C 1910

Patent

active

043908799

ABSTRACT:
An apparatus is disclosed for converting a physical quantity into variations in electric current. The apparatus comprises a power source, a control circuit for controlling an output amplitude of the power source, a detecting circuit supplied with the output of the power source, the electrical characteristics of the detecting circuit being varied in accordance with a physical quantity to be measured and ambient conditions, a converting circuit for amplifying the difference between a first electrical output of the detecting circuit and a reference value, and for converting the amplified difference into an output of the apparatus, and a negative feedback circuit for feeding back a portion of the output to the control circuit. A second electrical output of the detecting circuit is also input to the control circuit whereby the output of the control circuit controls the output amplitude of the power source.

REFERENCES:
patent: 3517556 (1970-06-01), Barker
patent: 3742473 (1973-06-01), Hadden
patent: 3906471 (1975-09-01), Shawhan
patent: 3967064 (1976-06-01), Sigworth
patent: 3975719 (1976-08-01), Frick
patent: 4198621 (1980-04-01), Roper

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