Light guide for liquid detection and cable comprising such a guide
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United States of America Patent
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-
Jun 24, 1986
Issued Date -
N/A
app pub date -
Apr 18, 1985
filing date -
Feb 9, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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