Acoustic Field of a Linear Phased Array: A Simulation Study of Ultrasonic Circular Tube Material

Abstract

As ultrasonic wave field radiated by an ultrasonic transducer influences the results of ultrasonic nondestructive testing, simulation and emulation are widely used in nondestructive testing. In this paper, a simulation study is proposed to detect defects in a circular tube material. Firstly, the ultrasonic propagation behavior was analyzed, and a formulation of the Multi-Gaussian beam model (MGB) based on a superposition of Gaussian beams is described. The expression of the acoustic field from a linear phased-array ultrasonic transducer in the condition of a convex interface on the circular tube material is proposed. Secondly, in order to make the tapered probe wedge better fit the curved circular tube material and carry out the ultrasonic inspection of the curved surface, it was necessary to pare the angle probe wedge. Finally, acoustic field simulations in a circular tube were carried out and analyzed. The simulation results indicated that the method of ultrasonic phased-array inspection is feasible in circular tube testing. Tube materials with different curvatures need different array element lengths and widths to get the desired focused beam.

Acoustically Driven Microbubbles Enable Targeted Delivery of microRNA‐Loaded Nanoparticles to Spontaneous Hepatocellular Neoplasia in Canines

“…The therapeutic US pulse used for miRNA delivery had a derated in situ peak negative pressure of 5.3 MPa (MI = 3.8; Ispta = 26.4 mW cm −2 ), based on the previous study in a pig model of liver delivery. [11] MBs for Delivery: Clinically approved SonoVue contrast agent (approved in the United States under the name Lumason) was used for all the phantom and in vivo experiments. The agent consists of MBs made of a stabilized sulfur hexafluoride gas core surrounded by a phospholipid monolayer shell, with a mean diameter range of 1.5-2.5µm.…”

“…The therapeutic US pulse used for miRNA delivery had a derated in situ peak negative pressure of 5.3 MPa (MI = 3.8; Ispta = 26.4 mW cm −2 ), based on the previous study in a pig model of liver delivery. [ 11 ]…”

“…Time delays are designed to achieve constructive interference of individual US waves in the desired focal zone with high US pressures capable of inducing inertial cavitation. [10][11][12] The regions closer to the transducer or around the focal zone have significantly lower US induced pressures and are thereby incapable of inducing inertial cavitation to destroy MBs.…”

Wavenumber Imaging of Near-Surface Defects in Rails using Green’s Function Reconstruction of Ultrasonic Diffuse Fields

“…Eventually, these factors cause the formation of a blind zone of several millimeters in engineering materials during ultrasonic inspection. Transducer wedges can be added to reduce these effects, but at the expense of ultrasonic energy loss [6,7] and the appearance of artifacts in the imaging.…”

Modeling Flaw Pulse-Echo Signals in Cylindrical Components Using an Ultrasonic Line-Focused Transducer with Consideration of Wave Mode Conversion

“…Therefore, it is important to detect defects in these components to ensure their safety in service. Ultrasonic testing provides an effective technique to nondestructively test and evaluate material properties [2,3]. When a cylindrical component is tested using the ultrasonic method, line-focused transducers can concentrate acoustic energy in a line through the cylindrical interface of the component, which is helpful for detecting flaws.…”