Transmission method

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With the ultrasonic transmission method , ultrasound is sent from a transmitter head to a receiver head, which then check the material in between. It is a further development of the method to find a hollow place behind a wall by knocking (sound).

The error assessment is limited to the size of the discontinuities , the exact position and angular position in the material cannot currently (2004) be checked. Using numerical simulations, however, attempts are made to assign the captured signals to certain types of errors.

The ultrasound transmission method is seldom used in medicine, but is used in materials testing, such as the pulse-echo method, for complex workpieces or when required.