Method and article for a nearly zero temperature coefficient pre

Details Method and article for a nearly zero temperature coefficient pre Method and article for a nearly zero temperature coefficient pre

1987-04-20

1988-09-20

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

73724, G01I 912, H01G 700

Patent

active

047729830

ABSTRACT:
A method and the resulting article for providing a nearly zero temperature coefficient pressure transducer preferably comprising a cylindrical capacitor whose capacitance is a function of both externally applied pressure and, undesirably, of temperature. The variation of capacitance with temperature may be greatly minimized by selectively choosing a transducer material characterized by particular parameter constants such that the temperature coefficient of Young's modulus (.alpha..sub.E) is equal in magnitude but opposite in sign to the temperature coefficient of linear expansion (.alpha..sub.l). Moreover, the thermal variation of capacitance can be further minimized by selectively choosing a transducer material whose temperature coefficient of linear expansion and of Young's modulus are nearly zero. Fabricating a capacitance pressure transducer from materials characterized by .alpha..sub.E and .alpha..sub.l which are both equal and opposite in sign and/or very small in magnitude will greatly reduce the high pressure, temperature sensitivity of the transducer, especially when compared with the temperature sensitivity under pressure characteristics of conventional fused quartz pressure transducers.

REFERENCES:
patent: 2848710 (1958-08-01), Owen
patent: 3750476 (1973-08-01), Brown
patent: 3858097 (1974-12-01), Polye
patent: 3911902 (1975-10-01), Delpy
patent: 4495820 (1985-01-01), Shimada et al.

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