G - Physics – 01 – B
Patent
G - Physics
01
B
349/35, 349/41
G01B 17/00 (2006.01) G01S 7/527 (2006.01) G01S 15/10 (2006.01)
Patent
CA 1338766
In the method of ultrasonic transit-time measurement in liquid or solid materials by the pulse- reflection method, a test head transmits a pulse, if possible in the form of a shock wave, which travels through a buffer zone and partly enters the test piece and is partly reflected from its surface. The entry or back-wall echo reflected from the surface into the test head (the starting echo) is used to derive an echo-start signal for starting a transit-time measurement (echo-start), which is stopped by a subsequent back-wall echo (useful signal provided its amplitude exceeds an adjustable threshold value. The height of the threshold value in connection with the echo- start signal is progressively altered in dependence on the amplitude and variation in time of the starting echo; the threshold value initially has a high value during a first, adjustable-height threshold and then decreases along a slope, in accordance with a preset function and within an adjustable time, to a second threshold, which is also adjustable in height.
604654
Goedecke Hartmut
Prause Reinhard
Krautkramer Gmbh & Co.
Robic Robic & Associes/associates
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