An optical vibration sensor and sensing method based on birefringence resonance effect
A vibration sensor, resonance effect technology, applied in instruments, using wave/particle radiation, measuring devices, etc., can solve the problem of difficulty in achieving sensitivity and balance of measurement space range, and achieve high vibration detection, sensitive vibration detection, and improved sensitivity. Effect
Active Publication Date: 2020-08-04
张岳
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Both traditional optical vibration sensors struggle to achieve a balance between sensitivity and measurement spatial range
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[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0036] see Figures 1 to 9 , figure 1 It is a schematic diagram of the overall structure of the present invention, figure 2 is a structural schematic diagram of the polarization-maintaining annular cavity of the present invention, image 3 is the resonance demodulation curve of two ESOPs in the present invention, Figure 4 It is a schematic diagram of the relationship between the resonance characteristics of two ESOPs and the birefringence difference of on...
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The invention discloses an optical vibration sensor and sensing method based on a birefringence resonance effect. The optical vibration sensor comprises a laser emitting unit, a vibration sensing amplifying unit, a laser receiving unit and a standard waveform unit which are connected in sequence, wherein the laser emitting unit modulates light emitted by a light source; the vibration sensing amplifying unit introduces a modulated optical signal into a polarization-maintaining annular cavity, and the optical signal resonates to obtain two intrinsic polarization states; the laser receiving unitconverts the optical signal into an electrical signal, and obtains resonant demodulation curves and slope characteristics of the two intrinsic polarization state ESOPs, and a phase difference betweenthe two polarization states is utilized to achieve the induction of the vibration; the standard waveform unit performs uniform modulation and demodulation on transmission signals. The optical vibration sensor and sensing method based on the birefringence resonance effect have the advantages that the birefringence resonance effect is utilized to amplify the sensitivity of the light to the vibration, thereby achieving the vibration induction with high sensitivity and large measurement space range.
Description
technical field [0001] The invention relates to a vibration sensor, in particular to an optical vibration sensor and a sensing method based on birefringence resonance effect. Background technique [0002] In the past few decades, optical vibration sensors have developed rapidly due to their high sensitivity, large measurement space range, and electromagnetic insensitivity. Existing optical vibration sensors mainly include distributed vibration sensors and point vibration sensors. Based on the Rayleigh scattering effect in the optical fiber, the distributed vibration sensor realizes continuous vibration field measurement on one optical fiber, which has the advantage of large spatial range measurement, but the sensitivity is poor, and it is not suitable for vibration in high sensitivity and extreme environments Measurement. Although the point-type vibration sensor has a small measurement space, it has excellent vibration measurement capabilities. It is difficult for two tra...
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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 张岳李绪友
Owner 张岳