This software option enables the DOP3000 velocimeter to measure the ultrasonic field generated by a transducer connected to the probe in/out connector.

The software automatically computes and detects the intensity and position of an echo issued from a small sphere moved perpendiculry to the US beam axis. By repeating the measurements at different depths it is possible to determine the divergence of the US beam, and therefore to have a much precise knowledge of the shape of the sampling gates.

Theoretically, the ultrasonic pressure field looks like the one depicted below, and in the ultrasonic field theory page of this website.

Signal Processing SA has measured the ultrasonic field of almost all of its transducer, using the system shown below. It enables to move a punctual reflector (needle head) to measure the ultrasonic energy reaching any point in space.