The feasibility of 3D ultrasonic scanner in air for the profile reconstruction of shoe tree is talked. The severe requirements on the spatial resolution (about 100 μm) issue to stress the ultrasound technique performances. High resolution time-of-flight measurement techniques based on phase measurement are combined with the ellipsoidal back-projection image reconstruction algorithm. A laboratory set-up is assembled to evaluate the achievement of the desired resolution by using wooden phantoms with constant cross sections characterised by sharp edges and low curvature radius. Preliminary experimental results are reported that show the system capability to reconstruct cross section profiles with rms and maximum errors equal to 0.48 mm and 1.2 mm respectively.
Low frequency PVDF transducers for 3D object profiling in air
Fiorillo A. S.;
1995-01-01
Abstract
The feasibility of 3D ultrasonic scanner in air for the profile reconstruction of shoe tree is talked. The severe requirements on the spatial resolution (about 100 μm) issue to stress the ultrasound technique performances. High resolution time-of-flight measurement techniques based on phase measurement are combined with the ellipsoidal back-projection image reconstruction algorithm. A laboratory set-up is assembled to evaluate the achievement of the desired resolution by using wooden phantoms with constant cross sections characterised by sharp edges and low curvature radius. Preliminary experimental results are reported that show the system capability to reconstruct cross section profiles with rms and maximum errors equal to 0.48 mm and 1.2 mm respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
