Institut Dr. Foerster Gmbh & Co. Kg

Bernhard Holzmayer

Michael Halter

A method for testing the material of a test object () in a nondestructive manner, said test object being moved relative to a probe () at a variable relative speed, comprises the following steps: detecting a probe signal (US) by means of the probe (), subjecting the probe signal (US) to analog-to-digital conversion in order to generate a digitized probe signal (USD) in the form of a sequence of digital words with a predefined, in particular constant, word repetition rate, n-stage decimation of the word repetition rate of the digitized probe signal (USD) or of a digital demodulation signal (UM) derived from the digitized probe signal by means of n cascaded decimation stages (_to_n), where n&#x2267;2, selecting an output signal (UA_to UA_n) of one of the n decimation stages (_to_n) depending on the instantaneous relative speed and filtering the selected output signal by means of a digital filter (), which is clocked with the word repetition rate of the selected output signal.

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Hohenstein, Germany

Bernhard Holzmayer