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A Dynamic Signal Measurement Method Based on Symbiotic Fiber Michelson Interferometer

A dynamic signal and interference signal technology, which is applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of measuring signal difference, unable to satisfy remote measurement of high sensitivity, high-frequency signals, etc.

Active Publication Date: 2020-04-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing technology cannot satisfy the problem of remote measurement of high-sensitivity and high-frequency signals, and to provide a dynamic signal measurement method based on the symbiotic fiber Michelson interferometer (SMI), which is used for two symbiotic MI Calculate the difference of the measured signal, eliminate the interference loaded on the SMI, and restore the signal to be tested, to meet the needs of remote measurement of high-sensitivity, high-frequency signals

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  • A Dynamic Signal Measurement Method Based on Symbiotic Fiber Michelson Interferometer
  • A Dynamic Signal Measurement Method Based on Symbiotic Fiber Michelson Interferometer
  • A Dynamic Signal Measurement Method Based on Symbiotic Fiber Michelson Interferometer

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Embodiment 1

[0037] The typical system structure of SMI-based dynamic signal measurement method is as follows: figure 1 shown. The wavelength of the dual-wavelength fiber laser 1 adopted in the present invention is λ 1 =1558.05nm (174μW), λ 2 =1549.38nm (430μW), the line width is less than 7.5MHz, the laser spectrum is as figure 2shown. The center wavelength of the first broadband fiber Bragg grating 4 is 1558.03 nm, and the bandwidth is 2 nm. The center wavelength of the second broadband fiber Bragg grating 5 is 1549.67 nm, and the bandwidth is 2 nm. Both Bragg gratings have a reflectivity of 98%, such as image 3 shown. The bandwidth of the broadband reflector 6 is 1500-1600nm, and the reflectivity is 98%. The reference arm L-A13 has a length of 100.5m, the guide fiber L-B11 has a length of 100m, and the sensing fiber S-C12 has a length of 3m.

[0038] A dynamic signal measurement method based on a symbiotic fiber Michelson interferometer. The laser emits two laser beams with dif...

Embodiment 2

[0043] A dynamic signal measurement method based on the symbiotic fiber Michelson interferometer. The laser emits two beams of laser light with different wavelengths. The laser beams of each wavelength meet the corresponding fiber grating and are reflected by the two ends of the fiber grating to form two beams of reflected light. , and interfere to form two Michelson interferometers; respectively demodulate the two Michelson interferometers, demodulate the phase signal, and then make a difference to the signal, the interference signal on the transmission path can be eliminated, and the obtained Measured dynamic signals;

[0044] The deformation system structure of the dynamic signal measurement method based on SMI is as follows: Figure 7 shown. The modified system omits the broadband reflector 6. The 3×3 coupler 3 is connected to the first broadband fiber Bragg grating 4 through the conducting fiber L-B11, and the first broadband fiber Bragg grating 4 is connected to the sec...

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Abstract

The invention relates to a dynamic signal measurement method based on a symbiotic optical fiber Michelson interferometer, and belongs to the technical field of interferometric optical fiber sensing. Two broadband fiber Bragg gratings with different center wavelengths are connected in series to a sensing arm, a broadband mirror is connected to a reference arm, and the symbiotic optical fiber Michelson interferometer (SMI) is formed. The SMI comprises two Michelson interferometers (MI) sharing the same 3*3 coupler and reference arm. The two MIs are demodulated by passive demodulation based on the 3*3 coupler. Difference between demodulation signals of the two MIs is calculated, interference loaded on the interferometer reference arm and conducting optical fiber is eliminated, and a signal tobe measured is recovered. The principle can also be realized by omitting the deformation structure of the broadband mirror. The demodulation technique can realize remote telemetry of the Michelson interferometer, and has the characteristics of being high in sensitivity and wide in frequency response range.

Description

technical field [0001] The invention relates to a dynamic signal measurement method based on a symbiotic optical fiber Michelson interferometer, belonging to the technical field of interference optical fiber sensing. Background technique [0002] In recent years, fiber optic dynamic signal (vibration, sound, etc.) measurement technology has received extensive attention. Among them, the dynamic signal sensor based on Fabry-Perot interferometer (FPI) is a much-anticipated solution because it is not affected by the interference signal on the conducting fiber and is suitable for remote measurement. However, limited by the cavity length of the sensor, the sensitivity of the FPI sensor is limited. The interference arm of the Michelson interferometer (MI) can be very long, so high measurement sensitivity can be obtained, however, the long reference arm makes the MI sensor very sensitive to interference signals, which brings great difficulties to signal measurement and cannot achie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 江毅贾景善姜澜胡洁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY