Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1998-03-10
2000-11-28
Chapman, John E.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
7351418, 73718, 3612834, G01P 15125, G01L 912
Patent
active
061519677
ABSTRACT:
A variable area capacitor with a flexible electrode responsive to a physical effect and a rigid electrode with a predetermined surface contour. The surface contour is dimensioned to provide a specific change in capacitance with deflection of the flexible electrode. A thin dielectric layer maintains a substantially fixed spacing between the two electrodes. Preferred embodiments include a pressure sensor, microphone and accelerometer. A differential transconductance amplifier detects changes of the variable capacitor in a low-impedance, bridge-like circuit and feeds back current to balance the bridge. The voltage that controls the feedback current is proportional to capacitance over a wide dynamic range.
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Carter et al., "Measurement of Displacement and Strain by Capacity Methods", Proc. J. Mech. E. (152) 1945, pp. 215-221.
Goodman Gene A.
Mauger Philip E.
McIntosh Robert B.
Patterson Steven R.
Chapman John E.
Horizon Technology Group
Hoyte, Jr. Alfred F.
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