Electricity: conductors and insulators – Feedthrough or bushing – Compression
Patent
1985-04-18
1986-06-24
Sikes, William L.
Electricity: conductors and insulators
Feedthrough or bushing
Compression
174 96, G02B 644
Patent
active
045964432
ABSTRACT:
A glass-fibre cable has been provided with a signalling conductor for signalling liquid which has penetrated into the cable sheath. The signalling conductor is a glass fibre, which is inserted in a protective perforated sheath in the usual way. The inner periphery of this sheath is provided with a wave-shaped pattern on one side, whereas the opposite side is provided with a layer of swelling powder. As soon as the liquid which has entered the cable, reaches the swelling powder, the volume of this swelling powder will considerably increase, in consequence of which the glass fibre will be pressed against the wave-shaped pattern. This causes microbending which involves a strong, measurable attenuation of the light signal transmitted through the glass fibre. The swelling powder can be applied to a substrate.
REFERENCES:
patent: 3786681 (1974-01-01), Kiehn
patent: 3931518 (1976-01-01), Miller
patent: 4019051 (1977-04-01), Miller
patent: 4118594 (1978-10-01), Arnaud
patent: 4270049 (1981-05-01), Tanaka et al.
patent: 4361381 (1982-11-01), Williams
patent: 4401366 (1983-08-01), Hope
patent: 4419157 (1983-12-01), Ferrentino
Applied Physics Letters, vol. 30, No. 10, May 15, 1980 (New York) J. N. Fields "Attenuation of a Parabolic-Index Fiber with Periodic Bends" pp. 799-801.
de Jongh Alphonsus G. W. M
Diemeer Martinus B. J.
Kirk Hugh Adam
Sikes William L.
Staat der Nederlanden (Staatsbedrifj der Posterijen, Telegrafie
Ullah Akm E.
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