It is one of the type of pulse velocity test.

It involve measurement of time required to travel for electrically generated mechanical pulse through the concrete,

These mechanical pulse can be generated either by hammer blow or by use of an electroacoustic transducer called soniscope.

Path length between transducer divide by the time of travel gives the average velocity of wave prapogation

An ultrasonic pulse velocity test is an in-situ, nondestructive test to check the quality of concrete and natural rocks.

In this test, the strength and quality of concrete or rock is assessed by measuring the velocity of an ultrasonic pulse passing through a concrete structure or natural rock formation. This test is conducted by passing a pulse of ultrasonic wave through concrete to be tested and measuring the time taken by pulse to get through the structure. Higher velocities indicate good quality and continuity of the material, while slower velocities may indicate concrete with many cracks or voids.

The transducer, clock, oscillation circuit, and power source are assembled for use. After calibration to a standard sample of material with known properties, the transducers are placed on opposite sides of the material.