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Title: Wireless boundary monitor system and method

A wireless boundary monitor system used to monitor the integrity of a boundary surrounding an area uses at least two housings having at least one transmitting means for emitting ultrasonic pressure waves to a medium. Each of the housings has a plurality of receiving means for sensing the pressure waves in the medium. The transmitting means and the receiving means of each housing are aimable and communicably linked. At least one of the housings is equipped with a local alarm means for emitting a first alarm indication whereby, when the pressure waves propagating from a transmitting means to a receiving means are sufficiently blocked by an object a local alarm means or a remote alarm means or a combination thereof emit respective alarm indications. The system may be reset either manually or automatically. This wireless boundary monitor system has useful applications in both indoor and outdoor environments. 4 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
563650
Assignee:
Lockheed Martin Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 055001; PA: EDB-98:013449; SN: 98001896319
Patent Number(s):
US 5,696,489/A/
Application Number:
PAN: 8-584,871; TRN: 98:002119
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 9 Dec 1997
Research Org:
Lockheed Martin Energy Syst Inc
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; INTRUSION DETECTION SYSTEMS; PHYSICAL PROTECTION; SECURITY; ULTRASONIC WAVES; ALARM SYSTEMS; WAVE PROPAGATION