Safe and real-time detection system and method of heavy haulage lines based on optical fiber sensor network

A real-time monitoring system and optical fiber sensing technology, applied in transportation and packaging, railway signal and safety, railway vehicle shape measuring instrument, etc., can solve the problems of high cost, low precision, inconvenient real-time online monitoring, etc., to reduce monitoring costs , Realize the effect of intelligent management

Inactive Publication Date: 2010-09-15
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problems of low precision, high cost, and inconvenient real-time online monitoring in the existing technical methods for safety monitoring of heavy-du...

Method used

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  • Safe and real-time detection system and method of heavy haulage lines based on optical fiber sensor network
  • Safe and real-time detection system and method of heavy haulage lines based on optical fiber sensor network
  • Safe and real-time detection system and method of heavy haulage lines based on optical fiber sensor network

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specific Embodiment approach 1

[0013] Specific implementation mode one: combine figure 1 Describe this embodiment, the heavy-duty transportation line safety real-time monitoring system based on optical fiber sensor network, it comprises light source 1, coupler 2, n rail fiber grating strain sensors 5, i rail fiber grating strain and acceleration combination sensor 8, m bridge fiber grating strain and temperature combined sensors 10, Fabry-Perot demodulator 11, computer 12, n rail fiber grating strain sensors 5, i rail fiber grating strain and acceleration combined sensors 8 and m bridge optical fibers The grating strain and temperature combined sensor 10 is connected in series through the transmission optical fiber 3 to form a monitoring area 7, wherein i, m, and n are even numbers, and every two rail fiber grating strain sensors 5 form a pair of rail fiber grating strain sensor pairs, a total of n / 2 pairs of rail fiber grating strain sensors 5 pairs, every two rail fiber grating strain and acceleration com...

specific Embodiment approach 2

[0014] Specific embodiment two: The difference between this embodiment and specific embodiment one is that n rail fiber grating strain sensors 5, i rail fiber grating strain and acceleration combination sensors 8, and m bridge fiber grating strain and temperature combination sensors 10 With different reflection wavelengths, the light source 1 is a broadband light source.

[0015] The optical signal band of the broadband light source 1 is wide enough to cover the reflection wavelength and each optical fiber The wavelength offset of the grating sensor, the wavelength interval between every two fiber grating sensors is larger than the offset of the maximum allowable partial load value in the wavelength of the reflected signal, so that the reflected wavelength will not overlap.

specific Embodiment approach 3

[0016] Specific implementation mode three: combination figure 2 Describe this embodiment, the difference between this embodiment and specific embodiment 1 or 2 is that the Fabry-Perot demodulator 11 is composed of a tunable optical fiber Fabry-Perot filter 13, a sawtooth wave signal generator 14 , photoelectric conversion, amplification, filter adjustment circuit 15, data acquisition device 16, a signal input end of the tunable optical fiber Fabry-Perot filter 13 is used to receive the external Fabry-Perot demodulator 11 Input signal, another signal input port of the tunable optical fiber Fabry-Perot filter 13 is connected with a signal output end of the sawtooth wave signal generator 14, the signal output of the tunable optical fiber Fabry-Perot filter 13 End is connected with the signal input end of photoelectric conversion, amplification, filter adjustment circuit 15, the signal output end of photoelectric conversion, amplification, filter adjustment circuit 15 is connecte...

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Abstract

The invention provides a safe and real-time detection system and a method of heavy haulage lines based on an optical fiber sensor network, relating to the technical field of optical fiber sensor networks and solving the problems of low precision, high cost and inconvenient real-time on-line detection of the existing heavy haulage rail haulage line safety monitoring technology. A rail fiber bragg grating strain sensor, a rail fiber bragg grating strain and acceleration combined sensor and a bridge fiber bragg grating strain and temperature combined temperature sensor are connected in series to form a monitoring area via transfer optical fibers; light emitted by a light source is incident in the monitoring area by a coupler; and when a heaving haul train passes through the rails in the monitoring areas, the running state among rails can lead the reflective wavelength of the fiber bragg grating to change, a computer judges the fracture condition at a rail seamless welding part, the damage conditions of train wheels, rails and roadbeds, inner strain condition caused by expansion and contraction of rails due to temperature and bridge structure safe state according to the change condition of the reflective wavelength. The invention is applicable to on-line monitoring of the heavy haulage lines.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensor networks, in particular to a system and method for safety monitoring of heavy-duty transportation lines. Background technique [0002] Since the advent of heavy-haul transportation, it has developed rapidly due to its remarkable economic benefits. At present, heavy-haul transportation has been internationally recognized as the direction of railway freight development. The tonnage of my country's heavy-duty trains has also developed from the earliest 5,000-ton class to 20,000-ton class. In the process of running heavy-duty trains, due to the increase in traffic volume and axle load, the existing line and bridge equipment and equipment levels are far from meeting the requirements, and the following failures are prone to occur: (1) The weld seam of the heavy-duty seamless track is broken and the wheel , rails, roadbed damage increased sharply. For example, within a few months after the...

Claims

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Application Information

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IPC IPC(8): B61K9/10B61K9/08B61K9/12B61L1/02
Inventor 刘盛春张丽莹
Owner HEILONGJIANG UNIV
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