Fiber optic grating transverse strain sensor system

A technology of transverse stress and grating, applied in the direction of converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve problems such as poor configuration of optical fiber sensors, limited use, and lack of compensation for temperature drift

Inactive Publication Date: 2004-06-30
SCHLUMBERGER OVERSEAS SA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Since these fiber optic sensors are poorly configured and have no means of comp

Method used

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  • Fiber optic grating transverse strain sensor system
  • Fiber optic grating transverse strain sensor system
  • Fiber optic grating transverse strain sensor system

Examples

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Embodiment Construction

[0064]Referring to the drawings, and especially to the reference numerals, 22 in FIG. 1 refers to a circularly symmetrical single-mode optical fiber. Written on the fiber core 24 is a fiber grating 26 . When a FBG 26 is connected to a FBG demodulation system 30, as shown in FIG. 2, changes in the FBG period caused by environmental changes such as strain and temperature can be measured by measuring the light Spectrum shift to determine. In the case of the demodulation system shown in FIG. 2 , a broadband light source such as a light emitting diode or a relatively narrowband tunable light source 32 is used to couple light into the fiber end face 34 . The coupled beam 36 then passes through a beam splitter, such as a fiber optic splitter 38 . One port of the fiber splitter 38 can be terminated with an areflective end 40 or it can be used to support measurements on additional fiber gratings. A portion of beam 36 is split into output port 42 of beam splitter 38 as beam 44 . The...

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Abstract

A system and method to sense the application of transverse stress to an optical fiber include a light source (32) that produces a relatively wide spectrum light beam, an optical fiber (22), a grating (26) within the fiber, and a spectrum analyzer (54). The light beam is reflected off or transmitted through the optical grating in the core (24) of the optical fiber that is transversely stressed directly by exposure to pressure. When transversely stressed, the optical grating produces a reflection or transmission of the light beam that has two peaks or minimums in its frequency spectrum whose spacing and/or spread are indicative of the forces applied to the fiber. One or more detectors sense the reflection or transmission from the optical grating to produce an output representative for the applied forces. Multiple optical gratings and detectors may be employed to simultaneously measure temperature or the forces at different locations along the fiber.

Description

technical field [0001] The present invention relates to an accurate and sensitive environmental sensor system for measuring transverse strain and transverse strain gradient, and a pressure sensor based on nearly temperature-independent or temperature-compensated transverse strain measurement. Background technique [0002] Applications of this type of lateral sensor system include localization, identification and measurement of lateral strains within aircraft or within space structures. In order to fulfill their mission, a continuous indication of the state of these structures, including lateral stress loads, must be provided in real time. Nearly temperature-independent or temperature-compensated FBG pressure sensors based on transverse strain can be used to measure pressure in liquid oxygen and liquid hydrogen tanks or other hazardous areas. Civil structural applications for these sensors include measuring lateral strain through bridges, buildings or highway structures, and...

Claims

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Application Information

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IPC IPC(8): G01D5/38G01B11/16G01D5/353G01D5/36G01K11/12G01L1/24
CPCG01D5/353G01D5/35387G01D5/35316G01D5/35354G01L1/246G01D5/35335
Inventor 埃里克·尤德
Owner SCHLUMBERGER OVERSEAS SA
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