Location

Snowmass Village, CO

Start Date

1-1-1995 12:00 AM

Description

Ultrasonic non destructive testing needs large focusing apertures in order to detect small defects in solid media. Current ultrasonic inspections use scanned immersion techniques. In recent years, two different approaches have been extensively studied in order to obtain focused beams through non-planar liquid-solid interfaces. The first technique uses one or several transducers whose geometry is matched to the liquid-solid interface and to the desired focal point. The second technique is based on the combination of a multi-elements array and on a set of electronic delay lines whose values are matched to produce focusing. These two techniques suffer from important limitations. They are based on an exact a priori knowledge of the interface geometry and require highly precise positioning of the defect.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

14A

Chapter

Chapter 4: Transducers, Sensors, and Process Control

Section

Ultrasonic Transducers

Pages

937-943

DOI

10.1007/978-1-4615-1987-4_118

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Basic Principles of Ultrasonic Time Reversal Processing in Non-Destructive Testing

Snowmass Village, CO

Ultrasonic non destructive testing needs large focusing apertures in order to detect small defects in solid media. Current ultrasonic inspections use scanned immersion techniques. In recent years, two different approaches have been extensively studied in order to obtain focused beams through non-planar liquid-solid interfaces. The first technique uses one or several transducers whose geometry is matched to the liquid-solid interface and to the desired focal point. The second technique is based on the combination of a multi-elements array and on a set of electronic delay lines whose values are matched to produce focusing. These two techniques suffer from important limitations. They are based on an exact a priori knowledge of the interface geometry and require highly precise positioning of the defect.