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METHOD FOR ERROR-FREE CHECKING OF TUBES FOR SURFACE FAULTS
METHOD FOR ERROR-FREE CHECKING OF TUBES FOR SURFACE FAULTS
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机译:用于表面故障的管材的无差错检查方法
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摘要
According to the invention, a near-real-time recording and analysis of data ispossible by means of the following steps: generation of a continuous analoguesignal, containing the back wall echoes, generation of a trigger signal inaddition to the US-signals, conversion of the analogue signal into a digitalsignal curve in a time window t1 to t2 with k data points with an adjustabletime t1 after a trigger pulse, the time t1 being set such that the signalreflected from the other surface side with the anticipated error signal lieswithin the time interval [t1 to t2], direct supply of the signal curve to adigital computer unit to carry out the wavelet transformation, optionaldigital transmission and analysis of the filtered signals on a superior dataprocessing system or analysis of the filtered signals on the digital computerunit, comparison of the determined parameter with a reference parameter,whereupon a determined error signal can be unambiguously assigned to the erroron the tube surface.
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