Optical fiber cable with tampering detecting means

Details Optical fiber cable with tampering detecting means Optical fiber cable with tampering detecting means

1988-03-10

1989-08-22

Sikes, William L.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 9610, 250227, 250231P, 174 25G, 174 70R, 340541, 340544, 340632, G02B 644, H01J 516, H01B 702, G08B 1320

Patent

active

048590240

ABSTRACT:
An optical fiber cable with optical fibers surrounded by a first gas blocking layer which is surrounded by a second gas blocking layer spaced from the first layer so as to provide longitudinal gas flow channels between the first and second layers. The channels are filled with a gas under a pressure above atmospheric pressure so that when the second layer is punctured, there is a gas flow and/or gas pressure drop indicating such puncturing and hence, if caused by tampering, the fact of tampering. Also, devices for indicating the gas flow and/or pressure drop and alarms and/or signal transmission terminating apparatus responsive to such devices.

REFERENCES:
patent: 1855321 (1932-04-01), Shackleton
patent: 3259892 (1966-07-01), Winckelmann
patent: 3862349 (1975-01-01), Watts
patent: 3865967 (1975-02-01), Pritchett
patent: 4000416 (1976-12-01), Goell
patent: 4112247 (1978-09-01), Dembiak et al.
patent: 4132854 (1979-01-01), Kemeny et al.
patent: 4436368 (1984-03-01), Keck
patent: 4581478 (1986-04-01), Pugh et al.
patent: 4720164 (1988-01-01), Oestreich
patent: 4755020 (1988-07-01), Willis et al.
patent: 4778248 (1988-10-01), Arzur et al.
Research Discl., "Double-Pressurised Optical Fibre Cable" Sep. 1978, No. 173, pp. 29-30.

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