Measuring and testing – Fluid pressure gauge – Null balance type
Patent
1978-11-09
1980-03-11
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Null balance type
73722, 73728, G01L 700
Patent
active
041921917
ABSTRACT:
A mechanical and electrical pressure sensor wherein the mechanical part includes a fluid pressure chamber with a magnetic, electrically conductive diaphragm moving out-of-contact with a stationary contact in the presence of pressure and into contact therewith in the absence of pressure or because of energizing of a cooperatively acting magnetic coil. The electrical circuit connected to the coil includes a clocked flip-flop, the output of which is high during a time interval when the contacts are open (coil energized) and which is low when the contacts are closed (coil deenergized). The duty cycle of energized time to total time is a measure of average coil winding current, and, hence, sensed pressure. The ratio of energized intervals to total intervals develops a useful digital measurement of pressure readily useful in a computer.
REFERENCES:
patent: 3908460 (1975-09-01), Lichowsky
patent: 4077262 (1978-03-01), Cholet
Tracor, Inc.
Vaden III Frank S.
Woodiel Donald O.
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