Imaging method and device for track board internal defect detection

Abstract

The invention discloses an imaging method and device for track board internal defect detection. The imaging method is characterized in that the imaging method comprises the following steps: exciting by using an ultrasonic transmitting and receiving device, transmitting an ultrasonic signal with the frequency between 20 and 100kHz into a track plate by using an ultrasonic array sensor, acquiring areflection echo signal of an internal defect of the track plate by using the ultrasonic array sensor in a one-transmitting and multi-receiving mode, and transmitting the reflection echo signal to a computer; and then adopting MATLAB software by the computer to carry out data storage and signal processing on the received reflection echo signal, and then obtaining a three-dimensional image of the internal defect of the track plate according to a time domain synthetic aperture focusing imaging algorithm and a three-dimensional imaging technology. According to the method, the internal defects of the track plate can be efficiently detected in a nondestructive and real-time manner, the detection result is basically not influenced by the external environment, and the detection precision is high.

Description

technical field [0001] The invention relates to an imaging method and device for detecting internal defects of a track slab, belonging to the technical field of track defect detection. Background technique [0002] Railways drive the great development of the national economy. High-speed railways have become an inevitable choice for modern railway transportation. As of the end of 2018, China’s railway operating mileage has reached more than 29,000 kilometers, more than 2 / 3 of the total mileage of high-speed railways in the world. Our country has It has become the country with the longest high-speed railway mileage and the highest transportation density in the world. Ballastless track has become the most important track structure form of my country's high-speed railway in recent years due to its advantages of high smoothness, good durability, and small maintenance and repair workload. For example, in many high-speed railways such as the Beijing-Tianjin Intercity Railway, the Be...

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Problems solved by technology

[0004] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide an imaging method and device for detecting internal defects of track slabs with high sensitivity, which is not easily disturbed by external conditions, so as to realize efficient, non-destructive and real-time detection of track slabs Internal defects provide timely warning and strong guarantee for the safe operation of high-speed rail

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