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Title: Compensated intruder-detection systems

Abstract

Intruder-detection systems in which intruder-induced signals are transmitted through a medium also receive spurious signals induced by changes in a climatic condition affecting the medium. To combat this, signals received from the detection medium are converted to a first signal. The system also provides a reference signal proportional to climate-induced changes in the medium. The first signal and the reference signal are combined for generating therefrom an output signal which is insensitive to the climatic changes in the medium. An alarm is energized if the output signal exceeds a preselected value. In one embodiment, an acoustic cable is coupled to a fence to generate a first electrical signal proportional to movements thereof. False alarms resulting from wind-induced movements of the fence (detection medium) are eliminated by providing an anemometer-driven voltage generator to provide a reference voltage proportional to the velocity of wind incident on the fence. An analog divider receives the first electrical signal and the reference signal as its numerator and denominator inputs, respectively, and generates therefrom an output signal which is insensitive to the wind-induced movements in the fence.

Inventors:
 [1];  [2]
  1. (Maryville, TN)
  2. (Andersonville, TN)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
865217
Patent Number(s):
US 4479113
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
compensated; intruder-detection; systems; intruder-induced; signals; transmitted; medium; receive; spurious; induced; changes; climatic; condition; affecting; combat; received; detection; converted; signal; provides; reference; proportional; climate-induced; combined; generating; therefrom; output; insensitive; alarm; energized; exceeds; preselected; value; embodiment; acoustic; cable; coupled; fence; generate; electrical; movements; false; alarms; resulting; wind-induced; eliminated; providing; anemometer-driven; voltage; generator; provide; velocity; wind; incident; analog; divider; receives; numerator; denominator; inputs; respectively; generates; detection systems; false alarms; signal proportional; reference signal; electrical signal; output signal; reference voltage; preselected value; signals received; voltage generator; signals induced; spurious signal; voltage proportional; spurious signals; selected value; intruder-detection systems; /340/

Citation Formats

McNeilly, David R., and Miller, William R. Compensated intruder-detection systems. United States: N. p., 1984. Web.
McNeilly, David R., & Miller, William R. Compensated intruder-detection systems. United States.
McNeilly, David R., and Miller, William R. Sun . "Compensated intruder-detection systems". United States. https://www.osti.gov/servlets/purl/865217.
@article{osti_865217,
title = {Compensated intruder-detection systems},
author = {McNeilly, David R. and Miller, William R.},
abstractNote = {Intruder-detection systems in which intruder-induced signals are transmitted through a medium also receive spurious signals induced by changes in a climatic condition affecting the medium. To combat this, signals received from the detection medium are converted to a first signal. The system also provides a reference signal proportional to climate-induced changes in the medium. The first signal and the reference signal are combined for generating therefrom an output signal which is insensitive to the climatic changes in the medium. An alarm is energized if the output signal exceeds a preselected value. In one embodiment, an acoustic cable is coupled to a fence to generate a first electrical signal proportional to movements thereof. False alarms resulting from wind-induced movements of the fence (detection medium) are eliminated by providing an anemometer-driven voltage generator to provide a reference voltage proportional to the velocity of wind incident on the fence. An analog divider receives the first electrical signal and the reference signal as its numerator and denominator inputs, respectively, and generates therefrom an output signal which is insensitive to the wind-induced movements in the fence.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1984},
month = {Sun Jan 01 00:00:00 EST 1984}
}

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