Seismic intrusion detector system

Patent · Thu Jan 01 00:00:00 EST 1976

OSTI ID:862663

Hawk, Hervey L ^[1]; Hawley, James G ^[1]; Portlock, John M ^[1]; Scheibner, James E ^[1]

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1. Albuquerque, NM

A system for monitoring man-associated seismic movements within a control area including a geophone for generating an electrical signal in response to seismic movement, a bandpass amplifier and threshold detector for eliminating unwanted signals, pulse counting system for counting and storing the number of seismic movements within the area, and a monitoring system operable on command having a variable frequency oscillator generating an audio frequency signal proportional to the number of said seismic movements.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• DOE Contract Number: AT(29-1)-789
• Assignee: United States of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 3984803
• OSTI ID: 862663
• Country of Publication: United States
• Language: English

Related Subjects

seismic
intrusion
detector
monitoring
man-associated
movements
control
including
geophone
generating
electrical
signal
response
movement
bandpass
amplifier
threshold
eliminating
unwanted
signals
pulse
counting
storing
operable
command
variable
frequency
oscillator
audio
proportional
signal proportional
variable frequency
electrical signal
frequency signal
pulse counting
audio frequency
intrusion detector
threshold detector
frequency oscillator
seismic movement
pass amplifier
/367/340/