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1. US20110255077 - Distributed Optical Fibre Sensor

Office United States of America
Application Number 13141290
Application Date 22.12.2009
Publication Number 20110255077
Publication Date 20.10.2011
Publication Kind A1
IPC
G PHYSICS
01
MEASURING; TESTING
D
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5
Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
26
using optical means, i.e. using infra-red, visible or ultra-violet light
32
with attenuation or whole or partial obturation of beams of light
34
the beams of light being detected by photocells
353
influencing the transmission properties of an optical fibre
G01D 5/353
CPC
G01L 1/242
G01D 5/35358
Applicants FOTECH SOLUTIONS LIMITED
Inventors Rogers Alan John
Priority Data 0823306.6 22.12.2008 GB
Title
(EN) Distributed Optical Fibre Sensor
Abstract
(EN)

A distributed optical fibre sensor is described. The sensor uses a sensor fibre (10) having a low or zero intrinsic birefringence that is responsive to an environmental parameter (24) such as pressure. Probe light pulses having a diversity of launch polarisation states are used to reduce signal fading and polarisation dependent loss in the retardation beat frequency signals which are sensed (20) and then analysed (22) to determine the environmental parameter as a profile along the sensor fibre.

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