Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-06-07
1997-12-09
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
340538, 310316, 324117R, 324126, 324244, G08B 2100
Patent
active
056964919
ABSTRACT:
A self-excited microelectromechanical device is described. The device includes a resonating structure, such as a cantilever, which responds to a physical phenomenon by generating an induced variable frequency voltage signal corresponding to the physical phenomenon. Self-excitation circuitry connected to the cantilever processes the induced variable frequency voltage signal and produces a variable frequency voltage signal in a resonant pass band of interest that is applied to the cantilever to augment the effect of the physical phenomenon on the cantilever. An exemplary use of the device is as a power line sensor. In this context, the cantilever responds to the electric field associated with a power signal on a power line. The cantilever transforms the voltage signal of the electric field into a corresponding frequency signal. The noise-immune frequency signal can be readily processed to reconstruct the power signals carried by the power line.
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Bustillo James M.
Campbell Gregory A.
Lee Seung
White Richard M.
Edwards, Jr. Timothy
Galliani William S.
Mullen Thomas
Regents of the University of California
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