Optical waveguides – Optical waveguide sensor – Including physical deformation or movement of waveguide
Patent
1992-11-23
1993-07-27
Lee, John D.
Optical waveguides
Optical waveguide sensor
Including physical deformation or movement of waveguide
385 32, G02B 626
Patent
active
052316815
ABSTRACT:
An optical fibre cable for temperature detection comprises an optical fibre and a temperature-responsive swellable body. The fibre and the swellable body are held together by a helically-wound wire. The swellable body includes an elastic tube which contains wax having a given melting point. When the wax melts, it expands in volume and causes the tube to swell and therewith stretch the wire, resulting in the bending of the optical fibre. The fibre cable (6) is used in an OTDR-system. The propagation of light pulses is measured and a heated section of the fibre cable is detected through the detection of attenuated, reflected light pulses. A desired light attenuation in a range of from 0.01-0.1 Db/m can be obtained by appropriate selection of the parameter values of the fibre cable for example the pitch of the wire helix and the volumetric expansion of the wax. This enables the locations of several heated sections along the fibre cable to be established.
REFERENCES:
patent: 4151747 (1979-05-01), Gottlieb et al.
patent: 4472628 (1984-09-01), Whitten
patent: 4654520 (1987-03-01), Griffiths
patent: 4729627 (1988-03-01), Saito et al.
patent: 4880970 (1989-11-01), Jones
patent: 5090818 (1992-02-01), Kleinerman
Patent Abstracts of Japan, vol. 2, No. 127, abstract of JP-53-107381, publ. Sep. 19th, 1978, Hitachi Densen K.K.
Patent Abstracts of Japan, vol. 10, No. 232 (P-486), abstract of JP-61-066133, publ. Apr. 4th, 1986, Agency of Ind Science & Technol.
Patent Abstract of Japan, vol. 11, No. 177 (P-583), abstract of JP-62-006128, publ. Jan. 13th, 1987, Mitsubishi Electric Corp.
Lee John D.
Ngo John
Telefonaktiebolaget LM Ericsson
LandOfFree
Optical fibre cable for detecting a change in temperature does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical fibre cable for detecting a change in temperature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical fibre cable for detecting a change in temperature will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2347940