Principle

An ultrasonic wave transmitted in a sample will be reflected at discontinuities (defects, cracks). From the relationship between the time of flight of the reflected wave and the sound velocity, the distance between ultrasonic transducer and defects (reflector) can be calculated. Position and size of these defects can be determined by measuring in different directions.

Benefits


Exciting experiment to teach the basics of ultrasound imaging (echography)

Diversified experiment with several measurement methods

With the same setup B-scans can be performed

Experiment setup can be upgraded for additional experiments in medical imaging and for echoscopy applications in material sciences


Tasks


Measure the longest side of the block with the calliper and the time off light of ultrasound wave for this distance with the 2 MHz probe.

Calculate the sound velocity.

Measure the position and the size of the different defects of the test block with the calliper and the ultrasound echography method.


What you can learn about


Propagation of ultrasonic waves

Time of  flight

Echo amplitude

Reflection coefficient

A-scan

Flaw detection

Non destructive testing (NDT)

Ultrasonic transceiver