| 摘要 |
A calibration verification tool 100 comprises a plurality of mutually oblique planar plates 110-140 defining surfaces at predefined angles with respect to one another. A method and apparatus for assessing calibration of a multi-axis ultrasonic scanner comprises providing the verification tool, providing a digital model of the tool defined in a reference frame; registering, by the ultrasonic scanner, the tool within the reference frame; controlling the ultrasonic scanner to measure a plate 110-140 to determine a reference signal: measuring a physical property of each plate 110-140; using the reference signal and the plate measurements, determining an orientation of the ultrasonic scanner when each plate was measured; and, using the determined orientations, verifying whether or not the ultrasonic scanner is calibrated. The tool 100 includes reference features 142, has a front convex surface 102 and a back convex surface, wherein each plate has uniform thickness. |
