High-Frequency Ultrasound Tests

Ultrasonic testing is often performed on steel and other metals and alloys, though it can also be used on concrete, wood, and composites, albeit with less resolution. It is a form of non-destructive testing used in many industries, including aerospace, automotive, and other sectors. 

High-frequency ultrasound tests should be performed using reflection methods with frequencies no lower than 1.5 MHz and probes with a maximum diameter of 25 mm using technology based on the variation of the first peak range to localize imperfections (Fig. 8.3). 

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Fig. 8.3 High-frequency ultrasound tests on a steel structure reinforced with FRP...

Essentially all imaging from medical ultrasound to non-destructive testing relies upon the same pulse-echo type of approach but with considerably refined electronic hardware. The refinements enable the equipment not only to detect reflections of the sound wave from the hard, metallic surface of a submarine in water but also much more subtle changes in the media through which sound passes (e. g. those between different tissue structures in the body). It is high frequency ultrasound (in the range 2 to 10 MHz) which is used primarily in this type of application because by using these... 

Non-destructive tests can be used to characterize the uniformity of apphcation acoustic stimulation tests can be carried out, as well as high-frequency ultrasound and acoustic thermography. 

Welding is possible by all the processes thermal, friction, ultrasound and high frequencies. Gluing is also possible with solvents. Preliminary tests are essential. 

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