Distributed optical fiber vibration sensing system and multi-point positioning method thereof
A vibration sensing system and distributed optical fiber technology, applied in the field of sensing and detection, can solve the problems of small monitoring range and high cost of multi-point positioning system, and achieve the effect of reducing cost
Active Publication Date: 2021-09-07
TIANJIN UNIV
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[0004] The purpose of the present invention is to design an interferometric distributed optical fiber vibration sensing system and its multi-point positioning method that can be applied in engineering, has a simple structure and low cost, and can meet the multi-point positioning function, so as to solve the problem of the relatively high cost of the existing multi-point positioning system. Disadvantages of high height and small monitoring range
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[0030] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining and illustrating the present invention, and are not intended to limit the present invention.
[0031] Such as figure 1 As shown, a distributed fiber optic vibration sensing system based on pulsed light modulation technology, including a light source 1, a magneto-optical control mechanism, an optical isolator 4, a first fiber coupler C1, a double Mach-Zehnder interferometer, and a data acquisition card 12 and industrial computer 13. Wherein, the light source adopts a narrow-band continuous optical laser with a wavelength of 1550nm and a maximum output power of 5mW as the light source of the system; the magneto-optical control mechanism includes a magneto-optic switch 2 and its driving device 3 for emitting The continuous laser signal is modulated in...
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The invention discloses a double Mach-Zehnder interferometer type distributed optical fiber vibration sensing system. The system comprises a light source, a magneto-optical switch, a magneto-optical switch driving device, an optical fiber coupler, a photoelectric detector, a sensing optical cable, a data acquisition card, an optical isolator, an optical circulator and an industrial personal computer, wherein the magneto-optical switch is used for modulating a continuous laser signal emitted by the light source into a periodic pulse optical signal with a certain duty ratio. Interference occurs in sensing optical signals in a fixed pulse light period, disturbance signals generated in a certain time period are effectively distinguished, and approximate multi-point disturbance positioning of the double-Mach-Zehnder interferometer type distributed optical fiber vibration sensing system is achieved. The invention also discloses a multi-point positioning method of the distributed optical fiber vibration sensing system. Compared with an existing scattering type distributed optical fiber vibration sensing multi-point positioning system, the system used in the method is simpler in structure, high in response speed, high in frequency response and low in manufacturing cost.
Description
technical field [0001] The invention belongs to the technical field of sensing and detection, in particular to a distributed optical fiber vibration sensing system based on pulse light modulation and a multi-point positioning method based on double Mach-Zehnder interferometers. Background technique [0002] As a new branch of sensing technology, optical fiber sensing technology is widely used in safety detection because of its superior characteristics such as anti-electromagnetic interference, corrosion resistance, small mass, small size, reusability, and networking. Distributed optical fiber vibration sensing technology, as an important branch of optical fiber sensing technology, integrates sensing and transmission, and can realize continuous detection of pressure or vibration signals around the optical fiber sensing link, and the sensing distance can reach tens of kilometers to hundreds of kilometers. At present, distributed optical fiber vibration sensing technology has ...
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IPC IPC(8): G01H9/00
CPCG01H9/004Y02P90/02
Inventor 刘琨刘铁根周子纯江俊峰丁振扬孙振世郭海若黄悦朗薛康
Owner TIANJIN UNIV