Intergrating, indicating, and controlling seismometer

Details Intergrating, indicating, and controlling seismometer Intergrating, indicating, and controlling seismometer

1991-04-10

1992-09-01

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

367188, 181122, 73654, H04R 1900

Patent

active

051445980

ABSTRACT:
A seismometer system which provides readouts of the time integral (Cumulative Absolute Velocity or CAV) of the acceleration time history of an earthquake. CAV is found to be a measure of the structural damage potential of an earthquake. Three triaxial low frequency acceleration sensors are connected into a digital computer system. Each sensor has a capacitive pickoff, whose capacitances determines the length of an electrical pulse; the pulse gates high-frequency clock cycles into a counter. The counts are summed to give the time integral. A microprocessor provides for periodic re-zeroing and other calibration functions, and for the actuation of alarms, relays and electrical pulses for utility shutoff and the like at predetermined levels of CAV. The acceleration time history of the earthquake is stored in the memory for later retrieval if desired. The whole system is contained in a small inexpensive package.

REFERENCES:
patent: 3740757 (1973-06-01), Engdahl
patent: 4223319 (1980-09-01), Engdahl
patent: 4630483 (1986-12-01), Engdahl
patent: 5069071 (1991-12-01), McBrien

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