An ultrasonic array is a single transducer that contains a number of individually connected
elements. Recent years have seen a dramatic increase in the use of ultrasonic arrays for …

Air-coupled ultrasonic (ACU) is a contactless ultrasonic measurement method which has
become increasingly popular for material characterization. This is due to a growing number …

Most ultrasonic guided wave methods require tone burst excitations to achieve some degree
of mode purity while maintaining temporal resolution. In addition, it is often desirable to …

This paper investigates various types of coded waveforms that could be used for air-coupled
ultrasound, using a pulse compression approach to signal processing. These are needed …

Ultrasonic arrays are increasingly widely used in nondestructive evaluation (NDE) due to
their greater flexibility and potentially superior performance compared to conventional …

Key message High-resolution imaging is possible if high-frequency sensors are used
together with a signal-processing and inversion algorithm that is well suited to a low signal …

Acoustics is a field with significant application in wood science and technology for the
classification and grading, through non-destructive tests, of a large variety of products from …

Considering a trade-off between temporal-spatial resolution and multi-mode nature of Lamb
waves, tone bursts with short durations are usually used as excitations in Lamb wave based …

Ultrasonic nondestructive imaging methods allow analyzing the inner structures of trees,
without altering their condition. In this study, we are interested in evaluating the influence of …

Guided wave imaging has shown great potential for structural health monitoring applications
by providing a way to visualize and characterize structural damage. For successful …