Steel rail flaw-detection method based on laser ultrasonic and high-speed photography image fusion

A laser ultrasound, high-speed camera technology, used in the analysis of solids using sonic/ultrasonic/infrasonic waves, optical testing of flaws/defects, etc.

Inactive Publication Date: 2014-12-24
BEIJING SHEENLINE GRP CO LTD
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Problems solved by technology

Ultrasonic flaw detection has the advantages of good directivity, strong penetrating ability, high detection sensitivity, detection

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  • Steel rail flaw-detection method based on laser ultrasonic and high-speed photography image fusion

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0030] Such as figure 1 As shown, the present invention provides a rail flaw detection method for image fusion of laser ultrasound and high-speed imaging, comprising the following steps:

[0031] Step 1. Install a laser ultrasonic excitation module and a high-speed camera module on the rail flaw detection car. When the energy of the laser is focused and irradiated on the surface of the elastic material, part of it will be transferred to the material itself and manifested in the form of thermal energy and stress wave energy. By changing The geometry of the excitation laser can control the distribution of energy in the material and its impact on the material. Laser ultrasound is to use the instantaneous thermal interaction between high-energy laser pulses and the surface of the...

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Abstract

The invention relates to the field of steel rail flaw-detection, in particular to a steel rail flaw-detection method based on laser ultrasonic and high-speed photography image fusion. The steel rail flaw-detection method comprises the following steps that: step 1, a laser ultrasonic excitation module and a high-speed photography module are installed on a steel rail flaw-detection car; step 2, the steel rail flaw-detection car moves along a steel rail to be detected, meanwhile, the laser ultrasonic excitation module transmits a pulse laser to the surface of the steel rail to be detected, so as to obtain laser ultrasonic detection data; moreover, the high-speed photography module photographs the surface of the steel rail to be detected to obtain digital image signal data; step 3, the laser ultrasonic detection data and the digital image signal data are fused together, and the flaw conditions of the steel rail to be detected are judged. The invention provides a flaw-detection method for obtaining the state of the actually-flawed surface of the steel rail and position information while carrying out flaw-detection on the steel rail, thus realizing the effective fusion of the laser ultrasonic detection data and the digital image signal data.

Description

technical field [0001] The invention relates to the field of rail flaw detection, in particular to a rail flaw detection method using laser ultrasonic and high-speed camera image fusion. Background technique [0002] Rail flaw detection is a type of profile flaw detection, and ultrasonic flaw detection is a commonly used method in rail flaw detection. Ultrasonic flaw detection is a method of indicating damage by measuring echo information and changes in the intensity of transmitted sound waves based on the principles of directional radiated ultrasonic beams reflecting on the defect interface or reducing the transmitted sound energy. Ultrasonic flaw detection has the advantages of good directivity, strong penetrating ability, high detection sensitivity, detection of defects in various orientations, fast detection speed, and low cost. Information on the condition and location of the damaged rail surface. Contents of the invention [0003] In view of the above technical pro...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N21/88
Inventor 饶昌勇王志全高光辉马建群郭成彬
Owner BEIJING SHEENLINE GRP CO LTD
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