Patent ID: 8841902
Filing Date: 2014-09-23
Classification: G01N

Abstract:
1. Test set-up for non-destructive detection of a flaw in a device being tested by means of an eddy current, comprising: an excitation coil adapted to act on a device being tested with an alternating electromagnetic field, a receiving coil adapted to generate a coil signal as a function of a flaw in the device being tested, an analog-digital converter having an input side which is coupled to the receiving coil, a filter arrangement having an input side which is coupled to an output side of the analog-digital converter and is adapted for band-pass filtering and scan frequency reduction, and a demodulator having an input which is coupled to an output of the filter arrangement wherein the filter arrangement comprises a band-pass filter, an input of which is coupled to the analog-digital converter and an output of which is coupled to the demodulator to issue an input signal, and wherein the filter arrangement further comprises a conversion system that is adapted to provide only one value as the demodulator input signal for scan frequency reduction of a first number of values of the input signal, whereby the first number is an integer greater than 1.