| US 7,578,166 B2 | ||
| Acoustic transducer calibration block and method | ||
| Roger E. Ethridge, Houston, Tex. (US); David A. Mandina, Belle Chassa, La. (US); Darko Kamenjasevic, Middelburg (Netherlands); and Christopher S. O'Neal, Metairie, La. (US) | ||
| Assigned to Grant Prideco, L.P., Houston, Tex. (US) | ||
| Filed on Jan. 14, 2008, as Appl. No. 12/13,583. | ||
| Prior Publication US 2009/0178466 A1, Jul. 16, 2009 | ||
| Int. Cl. G01M 1/14 (2006.01) | ||
| U.S. Cl. 73—1.82 | 11 Claims |
| 1. A method for calibrating a plurality of acoustic transducers prior to or after scanning a material to be investigated,
comprising:
providing that said plurality of acoustic transducers are mounted to a support frame for simultaneous movement therewith;
providing a calibration block comprising a plurality of known features;
positioning said support frame and said plurality of acoustic transducers against said calibration block;
making fewer than six scanning passes of said plurality of acoustic transducers with respect to said plurality of known features
for calibrating said plurality of acoustic transducers, said support frame and said plurality of acoustic transducers being
moved with respect to said plurality of known features in at least one desired direction in each of said fewer than six scanning
passes;
recording position information for said support frame;
recording respective outputs of said plurality of acoustic transducers in response to said plurality of known features; and
comparing said outputs to expected outputs in response to said known features.
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