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Angle beam measurement

Product No: P5160400

Principle

The experiment demonstrates the application of ultrasonic angle beam probes in non-destructive testing. Echoes of transverse and longitudinal waves coming from an aluminium testblock are investigated using three different delay line angles. For straight beam probes, the distance is calculated using simply the time of flight and the sound velocity of longitudinal wave. Angle beam probes require in addition the length of the delay line, the sound velocity of the transverse wave, the angle of the probe and the sound exit point of the delay line. The probe calibration is checked measuring half and full skip distance on a cylindrical discontinuity.

Tasks

Examine with three different angle delay lines, the half and full skip distance in an aluminium alloy bloc. Determine which probes allow to measure longitudinal and transverse wave echoes.
Measure first with the 38 ° and then with the 17 ° angle delay line, the time of flight and the positions of the probe at half and full skip distance.
Calculate the sound exit point, the incidence angle, the acoustic path, the sound velocity and the length of the delay line.
Check the probe characteristics on a cylindrical discontinuity. Measure the depth and the projected distance of the flaw in the test block and compare these values with the sketch.

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