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Distributed optical fiber large-deformation measuring sensor

A distributed optical fiber, measurement sensor technology, applied in the field of sensors, can solve the problems of large deformation or displacement of measurement, difficult to meet engineering requirements, etc., to achieve the effect of anti-electromagnetic interference, simplifying line layout problems, and good durability

Active Publication Date: 2010-10-06
SUZHOU NANZEE SENSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual engineering, especially in engineering monitoring applications such as geotechnical engineering, the deformation or displacement to be measured is often large, beyond the range of general sensors, and it is difficult to meet engineering requirements

Method used

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  • Distributed optical fiber large-deformation measuring sensor
  • Distributed optical fiber large-deformation measuring sensor
  • Distributed optical fiber large-deformation measuring sensor

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The present invention adopts tight sleeve single-mode optical fiber or single-mode bare fiber, and the same sensor adopts the same optical fiber. The sensor also includes a packaging device, which is composed of a casing, a top plate, a bottom plate, a sleeve, and a spring and a spring rod to form a fixing device. The spring is inside the casing and the sleeve. Connect, and ensure that the spring and the top and bottom plates can rotate freely, eliminating the influence of torque on the measurement accuracy of the sensor. The sensor is connected with the measured object through bolts, buckles and magnets.

[0022] Through the corresponding relationship between spring expansion and contraction and spring spring rod strain, the transformation from large deformation (spring expansion and contraction) to small strain (spring rod strain) is realized. Specifically, grooves are carved on the outermost side of the spring rod, and the sensing optical fiber is laid in it, and th...

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Abstract

The invention discloses a distributed optical fiber large-deformation measuring sensor which is characterized in that a stain sensing optical fiber is embedded into a large-deformation measured spring, particularly embedded into or fixed on a spring rod interlocked with the spring; one end of the large-deformation measuring sensor is fixed with the spring rod so that when the spring expands to become deformed, the deformation quantity of the spring is corresponding to that of the spring rod and has the corresponding relation with the deformation quantity of the stain sensing optical fiber; the deformation quantity of the spring can be obtained by measuring strain of the optical fiber, thus realizing the conversion from the large-deformation of the spring to the little strain of the optical fiber; and the stain sensing optical fiber is connected with the optical fiber of a Brillouin back scattering luminous power measuring instrument. The sensor is characterized by large measuring range, variable measuring range, stably, reliability, corrosion resisting, temperature self-compensation, realization of a plurality of series connections, easy to industrial production, convenient installation, etc.

Description

1. Technical field: [0001] The invention relates to distributed optical fiber sensing technology, which realizes the conversion of small optical fiber strain to large deformation through a special packaging process. The sensor is suitable for monitoring deformation or displacement of various projects with large deformation, and belongs to the field of sensor technology . 2. Background technology: [0002] BOTDR (Brillouin optical time-domain reflectometer), the Chinese name is Brillouin scattered light time-domain reflectometer, is a distributed optical fiber technology, which can continuously measure the strain and temperature distribution of optical fiber within tens of kilometers. The basic principle is: after the pulsed laser is injected into the fiber, Brillouin scattering occurs with the interaction of acoustic phonons, and the frequency shift of the Brillouin scattered light is linearly related to the strain or temperature change of the fiber. According to this linear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02G01B11/16G01B5/02G01B5/30
Inventor 施斌魏广庆李科张丹张魏张勇卢毅王可朴春德胡盛王宝军
Owner SUZHOU NANZEE SENSING TECH
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