Varying apparent mass accelerometer

Details Varying apparent mass accelerometer Varying apparent mass accelerometer

1994-11-23

1997-02-18

Williams, Hezron E.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

7351416, 7351432, 3612832, G01P 1500, G01P 15125, H01G 700

Patent

active

056043139

ABSTRACT:
A varying apparent mass accelerometer 1 for detecting earthquake vibrations includes a frame 2 vibrating with an earthquake wave, a mass 51 supported on the frame 2 via a spring 52, electrodes 6 and 7 disposed above and below the mass 51, power sources 8 each applying a voltage across the electrodes 6 and 7, and a capacitance detector 9 for detecting changes in capacitance between the electrodes. The accelerometer 1 exerts a signal only when an acceleration exceeds a threshold.

REFERENCES:
patent: 3723866 (1973-03-01), Michaud et al.
patent: 4928203 (1990-05-01), Swindal et al.
patent: 4930043 (1990-05-01), Wiegand
patent: 5006487 (1991-04-01), Stokes
patent: 5078220 (1992-01-01), Briefer
patent: 5101669 (1992-04-01), Holm-Kennedy et al.
patent: 5337606 (1994-08-01), Bennett et al.
patent: 5392650 (1995-02-01), O'Brien et al.
patent: 5417312 (1995-05-01), Tsuchitani et al.

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