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Five conventional nondestructive testing methods of non-destructive testing-ultrasonic testing

ultrasonic testing five conventional nondestructive testing methods for detection of internal defects in one way.

1912 ultrasonic detection technology has begun to probe the sea of ice, which is the first application of ultrasonic detection technology in navigation. 1929 ultrasonic testing of technology for product defects, remains the boilers and pressure vessels, rail, and many important mechanical products is an important tool. Today, the ultrasonic nondestructive detection sensitivity high, good beam directivity and defect detection rate, the advantages of broad applicability in the field of non-destructive testing plays a very important role. Involvement with computer technology, ultrasonic imaging, saying mature, making development of ultrasonic detection technology and automation to an image. Ultrasonic detection technology in materials engineering, municipal engineering, water conservancy projects and other aspects also come into play more and more 璽 role.

human ear receives acoustic range is 20Hz ~ 20kH, frequency below 20Hz Sonic, infrasonic, higher than 20 kHz sound waves called ultrasound. A common industry number MHz ultrasonic flaw detection. Ultrasonic detection using ultrasonic frequency rate high, and line sex strong, and easily in solid in the spread, encountered two species different media of interface easily reflection, features to detection material internal of defects, its principle following: probe to artifacts launches ultrasonic, and received defects interface reflection wave, will its conversion into electric signal transmission to instrument for processing; according to ultrasonic in media in the of spread speed (commonly known as sound) and spread time, calculation Hou on can know defects of location; defects more big, and reflection surface more big, reflection of energy also more big, According to the size of the reflected energy can be found the defect (equivalent) size.

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