Slope-assisted Brillouin fiber sensing vibration measuring device and measuring method of fixable frequency shifting structure
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A technology for optical fiber sensing and vibration measurement, which is used in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., to reduce costs, facilitate operation, and measure long distances.
Inactive Publication Date: 2019-01-11
GUANGXI NORMAL UNIV
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This kind of device is low in cost, easy to use, and easy to operate. The single-ended structure can solve the problem that the actual measurement distance in the traditional double-ended BOTDA system is half the length of the optical fiber.
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[0039] refer to figure 1 , figure 2 , a slope-assisted Brillouin fiber sensing vibration measurement device with a fixed frequency shift structure, including a narrow linewidth laser 1, a first optical coupler 2, an erbium-doped fiber amplifier 3, a second optical coupler 10, a second optical circulator 11;
[0040] The fixed frequency shift unit 16, the fixed frequency shift unit 16 includes the first optical circulator 4 and the third optical coupler 8 connected in sequence by the c port of the first optical circulator 4, an optical isolator 7, a polarization control 6, single-mode optical fiber 5, wherein the optical isolator 7 is connected to the output end of the third optical coupler 8, one end of the single-mode optical fiber 5 is connected to the polarization controller 6, and the other end of the single-mode optical fiber 5 is connected to The b port of the first optical circulator 4;
[0041] A pulse modulation unit 17, the pulse modulation unit 17 is provided wi...
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Abstract
The invention discloses a measuring method of slope-assisted Brillouin fiber sensing vibration measuring device of a fixable frequency shifting structure, and has the characteristics of comprising thefollowing steps: 1) obtaining BGS in a sensing fiber with a spectrum analyzer; 2) selecting a single mode fiber; 3) producing a continuous probe light; 4) producing a pulse pump light which a difference between the pulse pump light and a upper road continuous optical frequency is half of the half height and full width of a gain spectrum; 5) generating a stimulated Brillouin effect; 6) generatinga backscattered signal light; 7) collecting and processing data; 8) demodulating the vibration frequency on a sensing fiber. According to the measuring method of slope-assisted Brillouin fiber sensingvibration measuring device of a fixable frequency shifting structure, the effective measuring distance is far , the use method is simple, is convenient in operation, and can quickly detect dynamic strain to achieve the purpose of measuring vibration. The invention also discloses a slope-assisted Brillouin fiber sensing vibration measuring device of fixable frequency shifting structure.
Description
technical field [0001] The present invention relates to the field of optical fiber sensing, and mainly relates to a sensing method and device for vibration measurement by slope-assisted Brillouin optical time domain analysis (Slope-assisted BOTDA, referred to as SA-BOTDA), specifically a fixed frequency shift structure Slope-assisted Brillouin optical fiber sensing vibration measurement device and measurement method. technical background [0002] In the 1970s, with the development of optical fiber and optical fiber communication technology, optical fiber sensing technology began to start. Optical fiber sensing technology has the advantages of anti-electromagnetic interference, corrosion resistance, light weight, small size, reusability, and networking. It can monitor rotation, acceleration, electromagnetic field, temperature, pressure, stress, sound, vibration, humidity, viscosity, etc. , refractive index, concentration and other physical and chemical parameters, so it has ...
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