Measuring and testing – Fluid pressure gauge – Electrical
Reexamination Certificate
2005-12-13
2005-12-13
Oen, William (Department: 2855)
Measuring and testing
Fluid pressure gauge
Electrical
C073S700000, C073S754000
Reexamination Certificate
active
06973834
ABSTRACT:
Method and apparatus for measuring the pressure of a fluid medium, by immersing within the fluid medium an electrical resistor having a resistance varying with temperature; applying electrical current through the electrical resistor to heat it to a predetermined temperature above that of the fluid medium; and measuring the rate of change in resistance of the electrical resistor to produce a measurement of the rate of thermal heat dissipation, varying with the density of the fluid medium in which the electrical resistor is immersed, and thereby a measurement of the pressure of the fluid medium. The electrical resistor is a positive temperature coefficient thermistor driven by a constant voltage source and having a resistance which increases sharply at the predetermined temperature, such that the thermistor is automatically self-controlled to substantially maintain the predetermined temperature, whereby the electrical current drawn by the thermistor is a measurement of the thermal load on the thermistor resulting from the thermal heat dissipation therefrom, and thereby a measurement of the pressure of the fluid medium. Many applications of such method and apparatus are described, including a vacuum gauge, a pressure gauge, a barometer, a Pitot tube type speedometer, and a helicopter blade leak detector.
REFERENCES:
patent: 4521373 (1985-06-01), Terhune et al.
patent: 6536273 (2003-03-01), Schrittenlacher
patent: 6901808 (2005-06-01), Sharpless et al.
patent: 2004/0056321 (2004-03-01), Parsons
patent: 2004/0177966 (2004-09-01), Vinegar et al.
A.T.C.T. Advanced Thermal Chips Technologies Ltd.
Ellington Alandra
Oen William
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