Patent ID: 7578166

Claim:
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.