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Temperature sensor based on twisted double-core optical fiber

A technology of temperature sensor and dual-core optical fiber, which is applied in thermometers, thermometers with physical/chemical changes, coupling of optical waveguides, etc., can solve the problems of low mechanical strength of sensors and single method of interferometer dispersion turning point, etc., and achieve good mechanical Strength and reliability, high sensitivity effects

Active Publication Date: 2021-09-17
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] The present invention aims to solve the problems that the existing temperature sensor has a single method for obtaining the turning point of interferometer dispersion and the mechanical strength of the sensor is not high, and proposes a temperature sensor based on twisted double-core optical fiber

Method used

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  • Temperature sensor based on twisted double-core optical fiber
  • Temperature sensor based on twisted double-core optical fiber

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] The embodiment of the present invention is based on the temperature sensor of the twisted dual-core optical fiber. By twisting the dual-core optical fiber, the group optical path difference of the fundamental mode of the two cores of the dual-core optical fiber can be adjusted, so that the sensor can work in the quasi-dispersion mode of the interferometer. turning point state.

[0034] figure 1 It is a schematic structural diagram of a temperature sensor based on a twisted dual-core fiber in an example of the present invention. The embodiment of the present invention is based on a twisted ...

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Abstract

The invention discloses a temperature sensor based on a twisted double-core optical fiber. The temperature sensor comprises a double-core optical fiber, tapering coupling areas at the two ends of the double-core optical fiber are connected with single-mode optical fibers respectively, two fiber cores of the double-core optical fiber are twisted to be spiral, the distances between the centers of the two fiber cores and the axis of the optical fiber are different, and formed spiral line screw pitches are different; and the group optical path difference of the signals in the two fiber cores approaches to zero. According to the invention, the optical fiber can obtain a high-sensitivity effect similar to a dispersion turning point without tapering.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a temperature sensor based on a twisted double-core optical fiber. Background technique [0002] Optical fiber temperature sensor has the advantages of high sensitivity, small size, light weight, corrosion resistance, anti-electromagnetic interference, and electrical insulation. Big market demand. Among the fiber optic temperature sensors with different structures, the interferometric fiber optic temperature sensor has attracted extensive attention of researchers because of its advantages of high sensitivity, flexibility and variety, and wide range of measurement objects. However, the temperature sensitivity of conventional fiber optic interferometers is usually only a few tens of picometers per degree Celsius (°C) due to the influence of the thermo-optic coefficient of quartz. The recently proposed interferometric optical fiber sensor based on the dispersion turning point ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G02B6/25G02B6/255
CPCG01K11/32G02B6/25G02B6/255
Inventor 周爱刘佳欣李俊李浩蒋佩蓁
Owner WUHAN UNIV OF TECH
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