G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 29/07 (2006.01) G01N 17/00 (2006.01) G01N 29/38 (2006.01) G01N 29/10 (1990.01)
Patent
CA 2098480
A delay time measurement method for ultrasound of the type wherein a testing head transmits an excitation pulse that is as close as possible to the shape of a shock wave and traverses a pretravel path until it reaches the object to be examined which has a front wall and a rear wall, with at least one reflected pulse being generated at its front wall as well as at its rear wall. To improve the above-mentioned type method so that delay time measurements for thickness determinations and abnormalities can be performed reliably even on rough surfaces and if reflected pulses are missing or falsified, a time window is determined for the recording of reflected pulses that follow the excitation pulse, within which window all successive reflected pulses are digitized. Then the reflected pulses that lie within the time window are digitally filtered and parametrized, and the filtered and parametrized reflected pulses are fed to a computer unit and are evaluated on the basis of variable criteria using a predetermined algorithm.
Herth Armin
Kuhner Thomas
Stripf Helmut
Fetherstonhaugh & Co.
Forschungszentrum Karlsruhe Gmbh
Kernforschungszentrum Karlsruhe Gmbh
Pipetronix Gmbh
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