G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 17/02 (2006.01) G01N 29/27 (2006.01) G01N 29/30 (2006.01) G01N 29/32 (2006.01) G01N 29/10 (1995.01)
Patent
CA 2152102
Apparatus (10) for measuring the physical properties of an tube (T) or similar object using an ultrasonic testing method. A pulse generator (12) generates an electrical pulse having a predetermined set of characteristics. Transducers (20a, 20b) simultaneously convert the pulse to an ultrasonic waveform (W) and propagate the waveform at the tube from at least two different directions. The transducers then convert echoes (E1-E3) from the tube into electrical response pulses. Another transducer (24a) propagates a similar waveform at a reference object (B) and converts an echo from the reference object into a reference electrical response pulse. The reference response pulse is then combined with each of the other response pulses. Separate receivers (28a, 28b) receive the respective combined response pulses and converts them to digital data stored in a memory (32). A multi-channel processor (36) simultaneously, separately reconstructs each combined waveform and determines from each separate reconstruction a value representing a physical characteristic of the tube. Processing first involves performing a "real time" evaluation the combined waveform to determine if it meets threshold criteria. If so, the multi-channel processor performs linear interpolation and finite impulse responses on the digital data to precisely measure time of flight (TOF) values. A separate processor (54) includes a computing section (60) for mathematically combining the respective TOF values derived from the separate reconstructions to ascertain yet other physical characteristic values of the tube. Additionally, this processor includes a section (62) for comparing each physical characteristic value with a predetermined set of limits for each of the values to determine if the measured values fall within the limits. The results of the comparison can be displayed to an operator, and a permanent record of the values is also made.
Borden Ladner Gervais Llp
Emerson Electric Co.
Krautkramer-Branson Incorporated
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