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Optical fiber track occupation monitoring system and method based on vibration measurement

A vibration measurement and monitoring system technology, applied in measurement devices, measuring ultrasonic/sonic/infrasonic waves, and using wave/particle radiation, etc. Effect

Inactive Publication Date: 2019-02-15
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the track occupancy monitoring equipment in the prior art that are easily subject to electromagnetic interference and require manual reset, and provide a fiber optic track occupancy monitoring system and method based on vibration measurement, which can directly determine the track occupancy interval

Method used

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  • Optical fiber track occupation monitoring system and method based on vibration measurement
  • Optical fiber track occupation monitoring system and method based on vibration measurement
  • Optical fiber track occupation monitoring system and method based on vibration measurement

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Embodiment 1

[0032] Embodiment 1 A fiber optic track occupancy monitoring system based on vibration measurement

[0033] like figure 1 As shown, in Embodiment 1, a fiber optic track occupancy monitoring system based on vibration measurement, the system includes: the system includes one less fiber grating vibration acceleration sensor unit 1 and a fast demodulation unit 2 based on matching fiber grating; fiber grating vibration The acceleration sensor unit 1 includes a fixing device, a first fiber grating 11, a second fiber grating 12 and a cantilever beam, wherein one end of the fixing device is fixed on the track, and the other end is connected to the cantilever beam, and the first fiber grating 11 is arranged on the cantilever beam and a second fiber grating 12;

[0034] The fast demodulation unit 2 based on the matched fiber grating includes a fiber grating demodulator 21, a circulator 22 and an oscilloscope 23, and the fiber grating demodulator 21 includes a light source 211 and a pho...

Embodiment 2

[0039] Embodiment 2 A method for monitoring fiber optic track occupancy based on vibration measurement

[0040] like figure 2 Shown, in embodiment 2, a kind of optical fiber track occupancy monitoring method based on vibration measurement comprises the following steps:

[0041] S01: install a fiber grating vibration acceleration sensor unit 1 on the rail;

[0042]S02: The light signal output by the light source 211 enters the first fiber grating 11 through the first port a and the second port b of the circulator 22. When no train passes through the area where the fiber grating vibration acceleration sensor unit 1 is located, the first fiber grating 11 and the second fiber grating The grating grating 12 is in a matching state, and the light in the wavelength band that meets the phase matching condition of the first fiber Bragg grating 11 is reflected by the first fiber Bragg grating 11, and the reflected optical signal passes through the second port b of the circulator 22, th...

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Abstract

The invention discloses an optical fiber track occupation monitoring system and method based on vibration measurement. The system comprises at least one optical fiber bragg grating vibration acceleration sensor unit (1) and a rapid demodulation unit (2) based on a matched optical fiber bragg grating; the optical fiber bragg grating vibration acceleration sensor units (1) comprise fixed ends, firstoptical fiber bragg gratings (11), second optical fiber bragg gratings (12) and cantilever beams; and the rapid demodulation unit (2) based on the matched optical fiber bragg grating comprises an optical fiber bragg grating interrogator (21), a circulator (22) and an oscilloscope (23), and the optical fiber bragg grating interrogator (21) comprises light source (211) and a photoelectric detector(212). A track occupation state is rapidly detected by using an optical fiber bragg grating vibration sensor, and the track occupation situation is monitored by combining optical fiber communication and other technology.

Description

technical field [0001] The invention relates to railway signal monitoring technology, in particular to a vibration measurement-based optical fiber track occupancy monitoring system and method. Background technique [0002] With the development of railway signaling technology and the wide application of railway signaling, railway signaling has also become a modern scientific management means and technology to improve the passing capacity of railway sections and stations and increase the economic benefits of railway transportation. Track vacancy detection is crucial in railway signaling and safety systems, track occupancy monitoring system is an important railway signaling equipment, and plays a big role in the process of track vacancy detection. [0003] Most of the traditional track occupancy monitoring equipment belongs to the electromagnetic system, which is prone to electromagnetic interference, which seriously affects the reliability and stability of the system, and requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B61L23/04G01H9/00
Inventor 张信普张志勇邹喜华罗斌潘炜闫连山
Owner SOUTHWEST JIAOTONG UNIV