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Device and method for simultaneous measurement of temperature and strain based on multi-longitudinal mode self-mixing effect of orthogonally polarized dual-wavelength laser

A dual-wavelength laser and orthogonal polarization technology is applied in the field of optical detection to achieve the effect of simple structure and reduced interference

Active Publication Date: 2020-09-25
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above schemes are all based on the simultaneous change of the wavelength of the sensing signal with temperature and strain, and then separate and measure it. It is necessary to combine expensive spectrometers or wavelength meters and complex wavelength demodulation schemes to achieve simultaneous measurement of temperature and strain dual parameters.

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  • Device and method for simultaneous measurement of temperature and strain based on multi-longitudinal mode self-mixing effect of orthogonally polarized dual-wavelength laser
  • Device and method for simultaneous measurement of temperature and strain based on multi-longitudinal mode self-mixing effect of orthogonally polarized dual-wavelength laser
  • Device and method for simultaneous measurement of temperature and strain based on multi-longitudinal mode self-mixing effect of orthogonally polarized dual-wavelength laser

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Embodiment 1

[0039] Such as figure 1As shown, the device for synchronously measuring temperature and strain based on the self-mixing effect of orthogonally polarized dual-wavelength multi-longitudinal mode lasers includes orthogonally polarized dual-wavelength lasers 1, sensing units 2, vibrating targets 3, polarization selective optical switches 4, and spectroscopic elements 5. An attenuator 6 and a signal processing unit 7 . The sensing unit 2 includes a sensing fiber, the sensing fiber is placed in the environment of the temperature and strain to be measured, the tail fiber of the orthogonally polarized dual-wavelength laser 1 is connected to one end of the sensing fiber, and the orthogonally polarized dual-wavelength laser 1 is the The laser light source is measured, and the outgoing laser passes through the sensing fiber, and shoots from one end of the sensing fiber to the vibrating target 3 . The vibrating target 3 receives the laser light emitted by the orthogonally polarized dual-...

Embodiment 2

[0067] Such as figure 2As shown, the device for synchronously measuring temperature and strain based on the multi-longitudinal-mode self-mixing effect of orthogonally polarized dual-wavelength lasers includes two multi-longitudinal-mode lasers 11 and 12 with different wavelengths, polarizers 101 and 102, and a polarization-maintaining coupler 10 , a sensing unit 2, a vibrating target 3, a polarization selective optical switch 4, a light splitting element 5, an attenuator 6 and a signal processing unit 7. The sensing unit 2 includes a sensing fiber, which is placed in the environment of the temperature and strain to be measured, and the tail fibers of two multi-longitudinal mode lasers 11, 12 with different wavelengths are respectively connected to a polarizer 101, 102, and the different wavelengths Lasers with different polarization states are generated and connected to one end of the sensing fiber through a polarization-maintaining coupler. Two multi-longitudinal mode lasers...

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Abstract

The invention belongs to the technical field of optical detection, and particularly relates to a device and method for simultaneously measuring the temperature and strain based on an orthogonal polarization dual-wavelength laser multi-longitudinal-mode self-mixing effect. The measuring device comprises a laser light source, a sensing unit, a vibration target, a polarizing selection light switch, alight splitting element and a signal processing unit, wherein the laser light source emits two orthogonal polarization lasers of different wavelengths. The measuring method comprises the steps: the laser light source emits the two orthogonal polarization lasers of the different wavelengths; the vibration target vibrates; the emitted lasers pass through the polarizing selection light switch at different moments to be switched into two output orthogonal polarization state lasers onto the vibration target to be fed back into a resonant cavity in the laser light source to form a self-mixing signal; different compensation distances are obtained under the polarization state 1 laser and the polarization state 2 laser correspondingly; and a temperature value and a strain value of an environment where sensing fibers are located are obtained simultaneously through the signal processing unit. The measuring method can simultaneously measure the temperature and the strain.

Description

technical field [0001] The invention belongs to the technical field of optical detection, and in particular relates to a device and method for synchronously measuring temperature and strain based on the multi-longitudinal-mode self-mixing effect of orthogonally polarized dual-wavelength lasers. Background technique [0002] At present, optical measurement methods have been maturely used in temperature measurement and strain measurement due to their advantages of non-contact measurement, high measurement sensitivity, and high measurement accuracy. In the online analysis and detection of intelligent materials and structures, the simultaneous online measurement of multiple parameters is the development trend of the current structural health status detection, and the simultaneous measurement of static strain and temperature is particularly important in the error correction of thermal strain. [0003] In the field of temperature measurement technology, the current temperature mea...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02
Inventor 吕亮向荣陈由泽马阳成桂华侨王焕钦刘建国
Owner ANHUI UNIVERSITY