A method for demodulating dynamic stress frequency in polarization maintaining fiber

A technology of polarization-maintaining optical fiber and dynamic stress, which is applied in the direction of measuring, measuring force, instruments, etc. by measuring the change of optical properties of materials when they are stressed

Active Publication Date: 2020-10-02
TIANJIN UNIV
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Problems solved by technology

For example, in the invention patent of application publication number CN104006948A "Method for demodulating the position of polarization-maintaining fiber polarization coupling point based on multi-peak splitting cycle", the multi-peak splitting phenomenon in the distributed polarization coupling test system is used to calculate the multi-peak splitting cycle and realize measurement of the relative position of the static polarization coupling point, but only for static stress cases

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  • A method for demodulating dynamic stress frequency in polarization maintaining fiber
  • A method for demodulating dynamic stress frequency in polarization maintaining fiber
  • A method for demodulating dynamic stress frequency in polarization maintaining fiber

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Embodiment Construction

[0020] The method for realizing dynamic stress frequency demodulation in polarization-maintaining optical fiber by using Michelson white light interferometer of the present invention, the specific operation process is as follows figure 1 Shown:

[0021] 1) Use the Michelson interferometer of the white light interference polarization coupling test system to scan to obtain the interferogram when the polarization maintaining fiber is subjected to dynamic stress: Gaussian beams emitted by superluminescent light-emitting diodes, after passing through the polarizer, become linearly polarized light and enter the polarization maintaining fiber. At a certain position of the polarization-maintaining fiber, a piezoelectric ceramic creates a dynamic coupling point for the polarization-maintaining fiber, so that the linearly polarized light is coupled to the orthogonal polarization state; at the exit end of the fiber, the beam expander converts the light in the fiber into parallel light , ...

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Abstract

The invention relates to a method for demodulating dynamic stress frequency in a polarization maintaining fiber which is realized by using a polarization coupling testing system of white light interference. The method includes the following steps: scanning by using a Michelson interferometer to obtain an interferogram of the polarization maintaining fiber under the dynamic stress; calculating theposition of a dynamic coupling point according to the interferogram collected by a photodetector when a moving mirror scans; adjusting the moving mirror in the Michelson interferometer according to the position of the dynamic coupling point to make the Michelson interferometer just compensate a light path difference generated in the polarization maintaining fiber; collecting changes of interference light intensity at the photoelectric detector when the Michelson interferometer compensates the light path difference in the polarization maintaining fiber; and performing time frequency analysis oninterference light intensity signals collected by the photoelectric detector, and obtaining instantaneous frequency information of the dynamic stress according to a result of the time frequency analysis.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a method for measuring and demodulating dynamic stress frequency in a polarization-maintaining optical fiber. Background technique [0002] In recent years, distributed optical fiber vibration sensing technology has made great progress. Due to its advantages of high sensitivity, anti-electromagnetic interference, corrosion resistance, wide frequency bandwidth, and large dynamic range, it can be used for health monitoring of long-distance infrastructure; airports, residents It has been widely used in areas such as intrusion detection in important areas such as residential areas. [0003] At present, distributed optical fiber vibration sensing technology can be divided into distributed optical fiber sensing based on interference principle and distributed optical fiber vibration sensing based on backscattering principle according to the principle. Distributed optical fiber sens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/24
CPCG01L1/242
Inventor 张红霞王宇瑶温国强贾大功刘铁根
Owner TIANJIN UNIV
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