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Detection device and detection method for micro-deformation of crack on surface of rail web

A surface crack and detection device technology, which is applied in the direction of measuring device, optical device, phase influence characteristic measurement, etc., can solve problems such as rail damage, falling blocks, train bumps, etc., and achieve comprehensive analysis, long-distance rapid positioning detection, high Effect of Precision Displacement Measurement

Active Publication Date: 2017-06-16
NANJING INST OF MEASUREMENT & TESTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The train rails are afraid of rusting, the sun and rain, and the excretion of train waste are the main reasons for the rusting of the rails. Even if the railway workers maintain daily maintenance and oiling (oiling on locomotives and artificial oiling), the corrosion has a great impact on the rails. damage is still great
Rust will slowly erode the rail surface, eroding the rail surface into a rough shape, and some places will start to lose blocks. When the blocks fall to a certain extent, the rail surface will become uneven, and some edges will be crushed. The train bumps when it passes by

Method used

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  • Detection device and detection method for micro-deformation of crack on surface of rail web
  • Detection device and detection method for micro-deformation of crack on surface of rail web
  • Detection device and detection method for micro-deformation of crack on surface of rail web

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Experimental program
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Effect test

Embodiment 1

[0034] Such as Figure 1-3 As shown, a rail waist surface crack micro-deformation detection device includes a broadband light source, a first coupler, a reference arm, a first sample arm, a second sample arm, a first signal acquisition circuit and a second signal acquisition circuit;

[0035] The reference arm includes piezoelectric ceramics; the light of the broadband light source is divided into reference light and signal light after passing through the first coupler, and the reference light reaches the piezoelectric ceramics after passing through the first circulator, and is reflected by the surface of the piezoelectric ceramics Returning to the first circulator to emit, the outgoing light is divided into two outgoing reference lights by the second coupler, and the two outgoing reference lights enter the first signal acquisition circuit and the second signal acquisition circuit respectively; the signal light passes through the third coupler After that, it is divided into tw...

Embodiment 2

[0045]It can be known from physical optics that in addition to the basic conditions of the same frequency, the same vibration direction, and constant phase difference, the two columns of light waves that interfere must also satisfy the sufficient condition that the optical path difference is within the coherence length of the light source. Low coherence Interference is generated by using this point. The calculation formula of the coherence length of the light source is:

[0046]

[0047] where: λ 0 Represents the central wavelength of the light source, Δλ represents the wavelength bandwidth; the coherence length represents the minimum accuracy of measuring the deformation of the rail waist.

[0048] It can be seen from the above formula that the present invention uses low-coherence signals for detection, which can achieve higher-precision displacement measurement (that is, microscopic rail deformation can be measured), so it is easier to detect early micro-cracks, and can e...

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Abstract

The invention discloses a detection device and a detection method for micro-deformation of a crack on the surface of a rail web. The detection device comprises a broadband light source, a first coupler, a reference arm, a first sample arm, a second sample arm, a first signal collection circuit and a second signal collection circuit, wherein light of the broadband light source is divided into reference light and signal light after passing the first coupler; the reference light reaches piezoelectric ceramic after passing a first circulator, returns the first circulator to be emitted out after being reflected by the surface of the piezoelectric ceramic, and is divided into two paths of reference light through a second coupler and then respectively enters the first signal collection circuit and the second signal collection circuit; the signal light is divided into two paths of signal light after passing a third coupler; the the two paths of signal light passes the corresponding first sample arm and second sample arm and then reach the surface of the rail web, and are reflected through the surface of the rail web and then are emitted out; and the two paths of emit-out signal light enters the first signal collection circuit and the second signal collection circuit. According to the device and the method, a non-contact optical low coherence flow detection method is adopted, and long-distance rapid positioning detection is realized.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, and in particular relates to a micro-deformation detection device and a detection method for rail waist surface cracks. Background technique [0002] Our country classifies rails according to the type of damage, damage location and damage cause. It is divided into 9 categories and 32 kinds of damage, and is numbered with two digits. The tens digit indicates the damage location and state, and the single digit indicates the damage caused. cause of damage. The train rails are afraid of rusting, the sun and rain, and the excretion of train waste are the main reasons for the rusting of the rails. Even if the railway workers maintain daily maintenance and oiling (oiling on locomotives and artificial oiling), the corrosion has a great impact on the rails. The damage is still great. Rust will slowly erode the rail surface, eroding the rail surface into a rough shape, and some places will start to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01N21/45G01B11/16
CPCG01B11/161G01N21/45G01N21/88G01N2201/088G01N2201/082G01N2021/458
Inventor 胡宁徐凌云朱永凯张喜彬
Owner NANJING INST OF MEASUREMENT & TESTING TECH
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