Weight responsive intrusion detector using dual optical fibers

Details Weight responsive intrusion detector using dual optical fibers Weight responsive intrusion detector using dual optical fibers

1982-01-18

1984-11-13

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250227, 340557, 340600, 340666, G08B 1322

Patent

active

044828900

ABSTRACT:
An intruder detection system wherein light pulses are fed from a light source to a detector via a transmitting optical fibre, an optical terminator and a receiving optical fibre, both fibres being either stepped index fibres or poor quality graded index fibres. The fibres are disposed in intimate contact throughout their length within a cable, and compression of the cable at any region of its length sufficient to cause microbending permits light pulses to breakthrough from one fibre to the other. The time interval between arrival at the detector of a light pulse received from the source after passage through the total length of the transmitting fibre and the receiving fibre, and arrival of a breakthrough pulse received after passage through the fibres only so far as the region of microbending and back again, is indicative of the location of the compresion. The cable may be laid around the perimeter of a site to be guarded so that compression will occur when an intruder crosses the cable. The system is not susceptible to interference and infra-red light pulses may be used to make the system totally covert.

REFERENCES:
patent: 4292628 (1981-09-01), Sadler
patent: 4297684 (1981-10-01), Butter
patent: 4418338 (1983-11-01), Burt

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