An absolute hydrophone calibration technique using ultrasonic far-field with optical interferometry was extended to 40MHz to evaluate the sound pressure amplitude generated by medical ultrasound equipment. A 1-mm nominal radius plane transducer was the calibration sound source for an ultrasonic far-field at 50mm propagation distance at 40MHz. The transducer’s effective radius was 0.88mm at 40MH...

Introduction The dissertation work is focused on devices, methods, and algorithms for gathering, analysis, and processing of sensor information in mobile robotics. Recently, this field has gained in importance, since mobile robots expose increasing variety of applications. Despite the achieved results in the field, there are still some unsolved problems: 1/ The price of some range-finders, such...

Viscoelastic heating induced by ultrasonic loading is an attractive method of consolidating polymer-matrix composites. An ultrasonically oscillating loading horn is applied to a small region at the laminate surface, which produces a spatially nonuniform strain energy field within the material. A fraction of this strain energy is dissipated during each ultrasonic loading cycle depending on the t...

*Correspondence: Alfonso Maffezzoli , Materials Science and Technology Group, Department of Engineering for Innovation, University of Salento, via per Monteroni, Lecce 73100, Italy e-mail: alfonso.maffezzoli@ unisalento.it Thermoplastic matrix composites are finding new applications in different industrial area, thanks to their intrinsic advantages related to environmental compatibility and pro...

ii ACKNOWLEDGMENTS I would like to thank the generosity of the Forensic Anthropology and Computer Enhancement Services (FACES) Laboratory at Louisiana State University for the use of its ultrasound equipment. I would like to express my gratitude to my advisor Ms. Mary H. Manhein for her guidance, patience, enthusiasm, and expertise. Without her kindness, I would not have been able to complete t...

The optimal process parameters of ultrasonic-assisted processing were studied to further improve the molding quality and mechanical properties Ni60/WC-TiO2+La2O3 composite coating. A single-factor experiment was used explore influences ultrasonic vibration frequencies on microstructure, elemental composition, phase hardness, wear resistance coating using scanning electron microscopy (SEM), an X...

We have developed a laser ultrasonic visualization(LUV) equipment. It can be used to study the ultrasound propagation in an arbitrary-shaped object, and also be used to the nondestructive inspection of materials and structures. The LUV equipment consists of the hardware and the software. The hardware consists of a pulsed laser, a scanning mirror (galvanometer scanner), an ultrasound sensor, a l...

This paper discusses a non-destructive evaluation (NDE) technique for the detection of damage in composite aircraft structures following high energy wide area blunt impact (HEWABI) from ground service equipment (GSE), such as heavy cargo loaders and other heavy equipment. The test structures typically include skin, co-cured stringers, and C-frames that are bolt-connected onto the skin with shea...