In accordance with DIN 50159-1, the specimen should typically have a minimum thickness of 5 mm to prevent interference from the original ultrasonic signal from the vibrating rod that was partially transferred into the piece. This fact might lead to an incorrect interpretation of the findings.

However, the superposition of the ultrasonic waves can be prevented by coupling, which involves putting a thin oil coating over the interface between the sample and an additional large substance. In this manner, the wave propagates into the neighbouring body rather than being reflected, and interference is avoided. For such, you might use the precision measurement stand’s base plate.

Another approach involves embedding the sample, which works well for surface measurements made with the UT200 scanner. Both approaches make it possible to do tests on smaller samples.

NextGen’s Ultrasonic Contact Impedance Hardness Tester – UH200 complies with DIN 50159-1.

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