METHOD AND DEVICE FOR TESTING THE MATERIAL OF A TEST OBJECT IN A NONDESTRUCTIVE MANNER
First Claim
1. A method for testing the material of a test object in a nondestructive manner, said test object being moved relative probe (1) at a variable relative speed, comprising the following steps:
- detecting a probe signal (US) by means of the probe (1),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, 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 or the instantaneous relative speed, andfiltering the selected output signal by means of a digital filter (7), which is clocked with the word repetition rate of the selected output signal.
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Abstract
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, comprises the following steps: detecting a probe signal (US) by means of the probe (1), 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 (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 and filtering the selected output signal by means of a digital filter (7), which is clocked with the word repetition rate of the selected output signal.
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Citations
9 Claims
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1. A method for testing the material of a test object in a nondestructive manner, said test object being moved relative probe (1) at a variable relative speed, comprising the following steps:
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detecting a probe signal (US) by means of the probe (1), 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, 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 or the instantaneous relative speed, and filtering the selected output signal by means of a digital filter (7), which is clocked with the word repetition rate of the selected output signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for carrying out a method for testing the material of a test object (8) in a nondestructive manner, said test object being moved relative to a probe at a variable relative speed, including detecting a probe signal (US) by means of the probe (1), 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, 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, and filtering the selected output signal by means of a digital filter (7), which is clocked with the word repetition rate of the selected output signal, wherein the device comprises;
the probe (1), an analog-to-digital converter (3) designed for subjecting the probe signal (US) to analog-to-digital conversion in order to generate the digitized probe signal, the n cascaded decimation stages (5_1 to 5_n), selection means (6) designed for selecting the output signal (UA_1 to UA_n) of one of the n decimation stages (5_1 to 5_n) depending on the relative speed, and the digital filter (7). - View Dependent Claims (8, 9)
- 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, and filtering the selected output signal by means of a digital filter (7), which is clocked with the word repetition rate of the selected output signal, wherein the device comprises;
Specification