Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-08-30
1997-04-29
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340601, 73654, 73649, 73657, 73594, 364420, 364421, 324323, 324324, 367185, G08B 2100
Patent
active
056253486
ABSTRACT:
A method and apparatus for sensing one or more physical parameters, including acoustic waves having frequencies from approximately 0 Hz to 15 Hz, electromagnetic waves having frequencies from approximately 0 Hz through 35 Hz and seismic waves having frequencies from approximately 0 Hz through 15 Hz, and detecting precursor seismic activity indicated therein. Acoustic waves are sensed using an infrasonic transducer that produces an electrical signal representative of such waves. Electromagnetic waves are sensed using a suitable antenna, the antenna preferably comprising AC power lines. The antenna produces an electrical signal representative of such waves. Seismic waves are sensed using an accelerometer that produces an electrical signal representative of such waves. In one embodiment of the invention, the electrical signals are routed to a signal conditioning mechanism that converts the signals into detect signals suitable for detection of precursor seismic activity, the detect signals being, in turn, routed to a processing unit for detection of precursor seismic activity. In another embodiment, the electrical signal representative of the electromagnetic radiation is passed in parallel through a filter function to isolate one or more detect signals having predetermined bandwidths, and through a comparison function to produce a rejection signal that indicates the presence of noise. The isolated detect signals and rejection signal are provided to a processing unit for detection of precursor seismic activity, if any. An I/O stage alerts the user of any potentially impending earthquake, the I/O stage's alarms being triggered when precursor seismic activity is detected.
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Farnsworth David F.
Park Larry A.
Hofsass Jeffery
Lee Benjamin C.
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