Seismic intruder detection using pressure waves

Details Seismic intruder detection using pressure waves Seismic intruder detection using pressure waves

1983-05-06

1984-08-28

Wilbur, Maynard R.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

Responsive to intruder energy

340566, H04B 106

Patent

active

044687630

ABSTRACT:
In combination: a geophone having a resonant frequency in the pressure wave band and a response that decreases with frequency below the resonant frequency; an amplifier connected to the geophone and having a gain which is substantially constant for frequencies above the resonant frequency, and which varies inversely with frequency for frequencies below the resonant frequency; a band-pass filter connected to the amplifier; a single channel rectifier connected to the band-pass filter; apparatus connected to the rectifier for obtaining short term and long term averages of the rectifier output; and apparatus including a comparator connectied to the last named apparatus for giving an output when the short term average exceeds the long term average by more than a predetermined amount.

REFERENCES:
patent: 3696369 (1972-10-01), Laymon et al.
patent: 4223304 (1980-09-01), Barowitz et al.

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