We investigate non-contact air-coupled ultrasonic Lamb wave detection of voids in
polyisocyanurate (PIR) foam filled sandwich panels with steel face sheets, a material …

Moving objects contactlessly in a large addressable 3D space usually requires moving parts
of an acoustic levitation device or running optimization algorithms in conjunction with it. We …

This paper focuses on the topology optimization of a broadband acoustic transition section
that connects two cylindrical waveguides with different radii. The primary objective is to …

Air-coupled ultrasonic phased arrays are utilized for many emerging applications and
typically consist of bending-plate piezoelectric ultrasonic transducers (PUT). Due to their …

Lamb waves are widely used in non destructive evaluation (NDE) applications for inspection
of sheet materials or pipes. However, simulation models of wave excitation focus on …

This paper describes a method to reduce false velocity detection by applying a partial
inversion pulse (PIP) to the ultrasonic time-domain cross-correlation (UTDC) method. False …

There are still several obstacles to calculating fluid flow rate measurement on custody
transfer, such as the distribution of one-phase fluid flow rate, less sTable pressure, and fluid …

Sandwich panels, composed of two steel faces and a rigid foam core, are an inexpensive
and lightweight option for construction industry. However, voids can form in the foam core …

Acoustic waveguides offer the separation of the transducers aperture from the radiating
aperture. In previous work, we used this design freedom to build air-coupled phased arrays …

Air-coupled ultrasonic non-destructive testing (NDT) enables the inspection of composite
materials for defects. In this paper, we investigate non-contact defect detection based on …