Steel rail flaw detection ultrasonic waveguide inclined probe and flaw detection method thereof

Abstract

The invention discloses a steel rail flaw detection ultrasonic waveguide inclined probe and a flaw detection method thereof. The probe comprises a shell, a sound absorption filler, at least one dielectric unit and at least one interface, wherein each dielectric unit is arranged inside the shell and comprises a wedged block, a dielectric wafer, a cable wire and a damping block; the dielectric waferis a dielectric ceramic piece of a thickness vibration mode; an included angle is formed between one surface of the wedged block and the horizontal plane; one surface perpendicular to a vibration direction, of the dielectric wafer, is flatly adhered to the surface of the wedged block; the damping block is tightly adhered to another surface perpendicular to the vibration direction, of the dielectric wafer; the sound absorption filler is arranged inside a vacant space except the dielectric unit inside the shell; the interface is arranged on one surface of the shell and is connected with the dielectric wafer through the cable wire. Due to adoption of the dielectric wafer of the thickness vibration mode, the probe is high in signal to noise ratio, low in cost and convenient to popularize, inaddition can be applied to flaw detection on rail heads and rail bottoms, and is long in single detection distance.

Description

technical field [0001] The invention relates to a flaw detection device and a flaw detection method thereof, in particular to an ultrasonic guided wave angle probe for rail flaw detection and a flaw detection method thereof, belonging to the technical field of nondestructive testing. Background technique [0002] Rail flaw detection is one of the key tasks to ensure the safe operation of trains. At present, ultrasonic technology is generally used for rail flaw detection. The ultrasonic probe transmits pulsed sound waves from the rail head tread to the rail and receives its reflected waves to detect damage. Ultrasonic flaw detection technology can only inspect a local area around the probe each time pulsed sound waves are emitted, and there are large flaw detection blind spots on both sides of the rail bottom. Although rail head damage is still the main factor causing rail breakage, the number of rail breakage events or accidents caused by rail bottom damage has also shown a...

AI Technical Summary

Problems solved by technology

[0005] I Bartoli et al., J Zhang et al., Lu Chao et al. used the hammering method to conduct ultrasonic guided wave flaw detection of rails. However, in the guided wave signal obtained by the hammering method, the modal recognition degree of the guided wave is low, so the guided wave receiving transduction is required. The sensor is close to the damage point, which is often difficult to achieve in actual detection

In addition, the hammering method is not suitable for production practice

[0006] In recent years, non-contact ultrasonic guided wave flaw detection based on laser ultrasonic and air coupling has also made great progress, but there are still obvious defects in signal-to-noise ratio, accuracy, and generalizability.

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