A pulse-compression procedure based on Non-Linear Chirp for Ultrasonic Non Destructive Testing is presented. Non-Linear Chirp signals can be tailored to reproduce any desired continuous spectrum. Here, such capability is exploited to take into account the features of the specific hardware set-up in use, and particularly to adapt the excitation signal to the probes. An application of the proposed procedure to Air-Coupled Ultrasound Imaging is also presented. In order to enhance the imaging resolution, L1 -norm Total Variation deconvolution is exploited and compared with standard L2-norm Wiener deconvolution. Although the usage of Air-Coupled probes entails a high attenuation of the ultrasonic signals due to transmission in air and reflections at the air-sample interface, the experimental results show that the combination of Pulse Compression technique and of advanced signal processing guarantees the effectiveness of the inspection.

Exploiting Non-Linear Chirp and Sparse Deconvolution to Enhance the Performance of Pulse-Compression Ultrasonic NDT / Ricci Marco; Callegari Sergio; Caporale Salvatore; Monticelli Marcello; Battaglini Luigi; Eroli Massimiliano; Senni Luca; Rovatti Riccardo; Setti Gianluca; Burrascano Pietro. - STAMPA. - (2012), pp. 1489-1492. (Intervento presentato al convegno 2012 IEEE International Ultrasonics Symposium tenutosi a Dresden, Germania nel 7-10 ottobre 2012) [10.1109/ULTSYM.2012.0372].

Exploiting Non-Linear Chirp and Sparse Deconvolution to Enhance the Performance of Pulse-Compression Ultrasonic NDT

CALLEGARI, SERGIO;CAPORALE, SALVATORE;ROVATTI, RICCARDO;
2012

Abstract

A pulse-compression procedure based on Non-Linear Chirp for Ultrasonic Non Destructive Testing is presented. Non-Linear Chirp signals can be tailored to reproduce any desired continuous spectrum. Here, such capability is exploited to take into account the features of the specific hardware set-up in use, and particularly to adapt the excitation signal to the probes. An application of the proposed procedure to Air-Coupled Ultrasound Imaging is also presented. In order to enhance the imaging resolution, L1 -norm Total Variation deconvolution is exploited and compared with standard L2-norm Wiener deconvolution. Although the usage of Air-Coupled probes entails a high attenuation of the ultrasonic signals due to transmission in air and reflections at the air-sample interface, the experimental results show that the combination of Pulse Compression technique and of advanced signal processing guarantees the effectiveness of the inspection.
2012
2012 IEEE International Ultrasonics Symposium
1489
1492
Exploiting Non-Linear Chirp and Sparse Deconvolution to Enhance the Performance of Pulse-Compression Ultrasonic NDT / Ricci Marco; Callegari Sergio; Caporale Salvatore; Monticelli Marcello; Battaglini Luigi; Eroli Massimiliano; Senni Luca; Rovatti Riccardo; Setti Gianluca; Burrascano Pietro. - STAMPA. - (2012), pp. 1489-1492. (Intervento presentato al convegno 2012 IEEE International Ultrasonics Symposium tenutosi a Dresden, Germania nel 7-10 ottobre 2012) [10.1109/ULTSYM.2012.0372].
Ricci Marco; Callegari Sergio; Caporale Salvatore; Monticelli Marcello; Battaglini Luigi; Eroli Massimiliano; Senni Luca; Rovatti Riccardo; Setti Gianluca; Burrascano Pietro
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/151896
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