Electronic security device

Patent · Wed Jan 01 04:00:00 EST 1992

OSTI ID:868198

Eschbach, Eugene A ^[1]; LeBlanc, Edward J ^[2]; Griffin, Jeffrey W ^[2]

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1. Richland, WA
2. Kennewick, WA

The present invention relates to a security device having a control box (12) containing an electronic system (50) and a communications loop (14) over which the system transmits a signal. The device is constructed so that the communications loop can extend from the control box across the boundary of a portal such as a door into a sealed enclosure into which access is restricted whereby the loop must be damaged or moved in order for an entry to be made into the enclosure. The device is adapted for detecting unauthorized entries into such enclosures such as rooms or containers and for recording the time at which such entries occur for later reference. Additionally, the device detects attempts to tamper or interfere with the operation of the device itself and records the time at which such events take place. In the preferred embodiment, the security device includes a microprocessor-based electronic system (50) and a detection module (72) capable of registering changes in the voltage and phase of the signal transmitted over the loop.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA
• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Institute (Richland, WA)
• Patent Number(s): US 5097253
• OSTI ID: 868198
• Country of Publication: United States
• Language: English

Related Subjects

/340/368/
12
14
50
72
access
adapted
additionally
attempts
boundary
box
capable
changes
communications
constructed
containers
containing
control
damaged
detecting
detecting unauthorized
detection
detects
device
device detects
door
electronic
embodiment
enclosure
enclosures
entries
entry
events
extend
interfere
loop
microprocessor-based
microprocessor-based electronic
module
moved
occur
operation
phase
portal
preferred
preferred embodiment
recording
records
reference
registering
relates
restricted
sealed
sealed enclosure
security
security device
signal
signal transmitted
tamper
time
transmits
transmitted
unauthorized
voltage
whereby