The work presents the development of a new ultrasound airbome scanner based on transducers operating at frequency < 100 KHz. The objects are scanned by a cylindrical array composed with low-cost and smallsize (few wavelength) PVDF transducers. The ultrasonic scanner is applied to the reconstruction of the three-dimensional profile of shoe trees and here it results competitive both with mechanical copying machines and with modern optical scanners. Nevertheless the accuracy requirements, less than 1 mm, issue required sophisticated time-of-flight measurements and application specific reconstruction software. The results are presented from measurements on extended test-objects with low curvature in controlled environment.
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