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Cable for distributed sensing

A cable and longitudinal axis technology, applied in the field of optical fiber distributed acoustic sensing, can solve the problem of indistinguishability

Inactive Publication Date: 2019-11-15
OPTASENSE HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Measurements of perturbations in the sensing fiber optic cable due to physical disturbances of the cable (e.g., dynamic strain) and perturbations due to thermal expansion or contraction (e.g., dynamic temperature changes) are therefore incompatible with each other in conventional DAS systems indistinguishable

Method used

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  • Cable for distributed sensing
  • Cable for distributed sensing
  • Cable for distributed sensing

Examples

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Embodiment Construction

[0025] Embodiments of the present disclosure relate to fiber optic cables suitable for use in fiber optic sensing, such as distributed acoustic sensing (DAS), with a desired or tuned thermal response to temperature changes and the use of such cables.

[0026] figure 1 A schematic diagram of a distributed fiber optic sensing setup is shown. A length of optical fiber 104 is removably connected at one end to an interrogator 106 and serves as a sensing fiber. The output from the interrogator 106 is passed to a signal processor 108, which may be co-located with the interrogator or may be remote, and optionally a user interface / graphical display 110, which may in fact be provided by an appropriate specified PC to achieve. The user interface may be co-located with the signal processor or may be remote from the signal processor.

[0027] Sensing fiber 104 may be several kilometers in length, and in some applications may be tens of kilometers in length. In a conventional DAS, the s...

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Abstract

This application relates to a fiber optic cable (104, 300) suitable for use with a distributed fiber optic sensor apparatus (106). The fiber optic cable includes at least one optical fiber (301) and aforce transformer (304) mechanically coupled to the at least one optical fiber. The cable may also include at least one cladding later (302) and / or a compliant material (303). The cable may be surrounded by a jacket layer (306). The force transformer (304) is configured to transform transverse forces due to dimension changes of the cable arising from a temperature variation of the cable into longitudinal forces to counteract the longitudinal component of said dimension change over a tuned temperature range. In this way optical path length changes due to a change of temperature can be reducedor eliminated providing a cable which is insensitive to temperature.

Description

technical field [0001] The present application relates to an optical fiber cable and a manufacturing method thereof, which are suitable for optical fiber sensing, especially for optical fiber distributed acoustic sensing. Background technique [0002] Fiber-optic distributed acoustic sensing (DAS) is a known type of sensing in which an optical fiber is deployed as a sensing fiber and interrogated using electromagnetic radiation to provide sensing of acoustic activity along its length, i.e. acting on the sensor. Sensing dynamic strain on the fiber. By analyzing the backscattered radiation from within the fiber, the fiber can be effectively divided into discrete sensing sections, which can be (but need not be) continuous. Within each discrete sensing section, mechanical perturbations of the fiber (such as dynamic strain due to incident acoustic waves) cause changes in the properties of the radiation backscattered from that section. This change can be detected and analyzed an...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35377G01D5/3538G02B6/4415G02B6/443
Inventor A.戈德弗雷
Owner OPTASENSE HLDG LTD
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