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Strain Array Sensors Cascaded by Single-Mode Heterogeneous Optical Fibers

An array sensor and single-mode optical fiber technology, applied in the field of optical fiber, can solve the problems of reduced sensor multiplexing capability, low transmittance, and limited number of sensors

Active Publication Date: 2021-06-08
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in the above-mentioned interferometer structure based on space division multiplexing, the reflectivity of light between sensors in the strain array sensor is high and the transmittance is low, so that the number of sensors that can be connected in series in the strain array sensor is limited, and it is extremely large reduces the sensor multiplexing capability of the system

Method used

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Embodiment

[0055] Example: see Figure 12 , the figure is an application based on the present invention—a Fizeau interferometer array composed of double-clad optical fibers. The strain array sensor is added to an interferometer to demodulate the white light interference signal. In the figure, a wide-spectrum light source 3, a signal processing unit 4, an optical fiber circulator 5, an optical fiber optical path difference scanner 6, and the structure of the optical path difference scanner 6 can be Michlson interferometer, MZ interferometer, Fizeau interferometer and Sagnac interferometer The optical path difference scanner composed of Etc. demodulates the white light interference signal returned from the strain array sensor cascaded with single-mode heterogeneous optical fibers.

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Abstract

The invention discloses a single-mode heterogeneous optical fiber cascaded strain array sensor, the main feature of which is: the strain array sensor is composed of a single-mode optical fiber 1, a double-clad optical fiber 2 and other parts to form a heterogeneous structure reflection surface, integrated in A strain array sensor on an optical fiber. The strain array sensor provided by the present invention can realize the measurement of factors such as the ambient temperature and stress of the optical fiber strain array sensor, and is especially suitable for high temperature conditions due to the inherent characteristics of the present invention. In addition, it also has the advantages of high sensitivity, compact structure, high temperature resistance, low cost, and a large number of multiplexed sensors.

Description

[0001] (1) Technical field [0002] The invention belongs to the field of optical fiber technology, and in particular relates to a strain array sensor with cascaded single-mode heterogeneous optical fibers. [0003] (2) Background technology [0004] In recent years, white light interferometric sensing technology has developed vigorously. One of the hot spots is the development of optical fiber sensors and test systems with multiple sensor multiplexing technologies for the measurement of physical quantities such as strain, temperature, and pressure. The background of the development of sensor multiplexing technology is mainly due to the fact that in actual measurement and testing applications, the sensing of a single physical quantity and a single location point is far from meeting people's requirements for the perception of the whole thing or system state, which often requires multiple or The distribution of multi-point physical quantities is measured online or in real time. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01L1/24G01K11/3206
Inventor 苑立波李文超
Owner GUILIN UNIV OF ELECTRONIC TECH
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