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EP0086024A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Light guide for liquid detection and cable comprising such a guide

Assignee: Staat der Nederlanden (Staatsbedrijf der Posterijen Telegrafie en Telefonie)
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Filing: 1983-02-04
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Granted: —
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Expires: 2003-02-04
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Abstract

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.

Inventors

  • 👤 Martinus Bernardus Johannes Diemeer
  • 👤 Alphonsus Gerardus W.M. De Jongh

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 03:24
CPC Classifications
G; G01; G01N; G01N19/00; G01N19/10; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/042; G01M3/045; G01M3/047; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4439; G02B6/4469

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 29 words
t. Signalling conductor, characterized by a tubular element, which is pervious to liquid and which contains besides a light guide, a material which swells under the influence of liquid.
Claim 2
Dependent Claim 46 words
Signalling conductor in accordance with claim 1, characterized in that the tubular element (1) comprises a pressure area provided with a wave-shaped pattern (3), the light guide (6) being pressed against the pressure area under the influence of liquid which has entered the tubular element (1).
Claim 3
Dependent Claim 23 words
Signalling conductor in accordance with claim 1 or 2, characterized in that the swelling material is inserted in or applied to a substrate.
Claim 4
Dependent Claim 20 words
Signalling conductor in accordance with claim 3, charaterized in that the substrate has a cross section which is mainly round.
Claim 5
Dependent Claim 38 words
Signalling conductor in accordance with claim I, 2 or 3, characterized in that the tubular element comprises a membrane (7), which is mounted as a separating wall (7) between the swelling material (5) and the light guide (6).
Claim 6
Dependent Claim 46 words
Cable, comprising one or more optical guides and a star-shaped core (9), characterized in that an optical signalling conductor (6) and a material (5), which swells under the influence of liquid, have been inserted in one or more of the notches (10) of the core (9)..

References Cited (Backward Citations)

DE2508315A1 Cited
WO1979000377A1 Cited
US4270049A Cited
DE2842077A1 Cited

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