Ultrasonic immersion testing pdf

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LEFT: A probe sends a sound wave into a test material. There are two indications, one from the initial pulse of the probe, and the second due to the back wall echo. RIGHT: A defect creates a third indication and simultaneously reduces the amplitude of the back wall indication. In most common UT applications, very short ultrasonic pulse-waves with center frequencies ranging from 0.

1-15 MHz, and occasionally up to 50 MHz, are transmitted into materials to detect internal flaws or to characterize materials. On May 27, 1940, U. The patent is granted on April 21, 1942 as U. 2,280,226, titled “Flaw Detecting Device and Measuring Instrument”.