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Method and device for testing the material of a test object in a nondestructive manner

  • US 8,907,828 B2
  • Filed: 07/18/2012
  • Issued: 12/09/2014
  • Est. Priority Date: 07/19/2011
  • Status: Active Grant
First Claim
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1. A method for testing the material of a test object (8) in a nondestructive manner, said test object being moved relative to a probe (1), at a variable relative speed, comprising the following steps:

  • detecting a probe signal (US) by means of the probesubjecting 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, wherein the n-stage decimation is performed by means of n cascaded decimation stages (5_1 to 5_n), where n≧

    2,selecting an output signal (UA_1 to UA_n) of one of the n decimation stages (5_1 to 5_n) depending on the instantaneous relative speed, andfiltering the selected output signal by means of a digital filter (7), which clocked with the word repetition rate of the selected output signal.

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