Sensing prob as well as fiber interfering device and method for inhibiting polarization-induced fading

A sensing probe and optical fiber technology, which is applied to measurement devices, instruments, and the use of wave/particle radiation, etc., can solve the problems of random fading of detection signals, reduce the signal-to-noise ratio of the system, increase the system cost, etc., to suppress the birefringence effect and The effect of polarization fluctuation, accurate detection of acoustic signal, and stable interference signal

Pending Publication Date: 2019-12-31
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Mach-Zehnder fiber interference structure is widely used in vibration signal measurement, but when the fiber is disturbed by the outside world, due to the birefringence effect of the fiber, the polarization state in the ordinary single-mode fiber will change randomly, resulting in random detection signals. Fading, especially when the polarization states of the light in the two arms of the fiber optic interferometer are orthogonal, the interference signal output by the interferometer is zero, so polarization-induced signal fading has become a serious problem affecting signal measurement of interferometric fiber optic sensors
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  • Sensing prob as well as fiber interfering device and method for inhibiting polarization-induced fading
  • Sensing prob as well as fiber interfering device and method for inhibiting polarization-induced fading
  • Sensing prob as well as fiber interfering device and method for inhibiting polarization-induced fading

Examples

Experimental program
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Example Embodiment

[0046] Example 1

[0047] Such as figure 1 As shown, this embodiment provides a sensing probe, which includes:

[0048] The sealed cavity 12 is provided with a sensing diaphragm 3, a first circulator 6 and a first Faraday rotator 7; the sensing diaphragm 3 is used to sense external sound wave vibration signals; the sensing diaphragm 3 is also provided There is a boss 13 to increase the sensitivity of the sensing probe; the sensing diaphragm 3 is provided with a sensing fiber ring 18, one end of the sensing fiber ring 18 is connected to the input fiber, and the other end is connected to the first port d of the first circulator 6. Connected, the second port e of the first circulator 6 is connected to the first Faraday rotator 7; the third port f of the first circulator 6 outputs detection light for sensing changes in external sound wave vibration signals.

Example Embodiment

[0049] As an embodiment, the sensing diaphragm adopts a circular elastic diaphragm.

[0050] For example, the Young's modulus of a circular elastic diaphragm is 10 GPa, Poisson's ratio is 0.3, radius is 50 mm, and thickness is 1 mm.

[0051] The advantage of the above technical solution is that this embodiment uses a circular elastic diaphragm to detect the sound wave vibration signal, so that only the compressed deformation at the center of the circular elastic diaphragm is detected, which can deform under weak sound wave signals, and thereby make It is pasted on the elastic diaphragm to sense the strain of the optical fiber ring, which improves the accuracy of acoustic signal detection.

[0052] As an embodiment, the boss is a circular boss, and the circle of the circular boss coincides with the center of the circular elastic diaphragm.

[0053] In this embodiment, the sensing diaphragm and the boss are made of the same material, and both are made of organic polymer materials. This...

Example Embodiment

[0070] Example 2

[0071] Such as figure 2 As shown, an optical fiber interference device for suppressing polarization fading in this embodiment includes:

[0072] The laser 1, the optical signal output by the first coupler 2 is equally divided into two beams of light, respectively enter the sensor arm fiber and the reference arm fiber; the sensor arm fiber and figure 1 The sensor probe shown is connected, wherein the sensor arm fiber is the input fiber; the reference arm fiber is connected to the first port a of the second optical circulator 4, and the second port b of the second optical circulator 4 is connected to the Two Faraday rotating mirrors are connected; the third port c of the second optical circulator 4 outputs reference light;

[0073] The third port f of the first optical circulator 6 and the third port c of the second circulator 4 are both connected to the second coupler 8, in which the probe light and the reference light interfere with each other and output Two chan...

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Abstract

The invention provides a sensing probe as well as a fiber interfering device and method for inhibiting polarization-induced fading. The sensing probe comprises a sealing cavity, wherein a sensor diaphragm, a first circulator and a first Faraday rotating mirror are arranged in the sealing cavity; the sensor diaphragm is used for sensing an external sound wave vibration signal; the sensor diaphragmis further provided with a boss for improving the sensitivity of the sensing probe; the sensor diaphragm is provided with a sensing fiber ring; one end of the sensing fiber ring is connected with an input fiber, and the other end is connected with the first port of the first circulator; the second port of the first circulator is connected with the first Faraday rotating mirror; and the third portof the first circulator is used for outputting detection light for sensing the change of the external sound wave vibration signal.

Description

technical field [0001] The disclosure belongs to the field of optical fiber interference devices, and in particular relates to a sensing probe, an optical fiber interference device and a method for suppressing polarization fading. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Optical fiber interference is widely used in the measurement of various external signals, such as vibration, temperature, stress, etc. Its principle is that the phase change of the interfering light is caused by the change of the external physical quantity, and the external physical quantity is realized by detecting the phase change of the interfering light. Measurement. Therefore, the acquisition of stable interference light becomes the key to realize the accurate measurement of external physical quantities. [0004] The Mach-Zehnder fiber interference structure...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 常天英张耀鲁王忠民杨悦崔洪亮
Owner JILIN UNIV
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