For decades, bearing factory quality evaluation has been a key problem and the methods used are always static tests. This paper investigates the use of piezoelectric ultrasonic transducers (PUT) as dynamic diagnostic tools and a relevant signal classification technique, wavelet packet entropy (WPEntropy) flow manifold learning, for the evaluation of bearing factory quality. The data were analyz...

DEVELOP SONIC INFRARED IMAGING NDE FOR LOCAL DAMAGE ASSESSMENTIN CIVIL STRUCTURESbyQi HeDecember 2010Advisor: Dr. Xiaoyan HanMajor: Electrical EngineeringDegree: Doctor of PhilosophyNondestructive Evaluation (NDE) is an interdisciplinary field of study, which isconcerned with the development of analysis techniques and measurement technologiesfor the q...

BACKGROUND Irrigation of the root canal system is an essential step in the endodontic treatment. The aim of this article is to introduce continuous apical negative-pressure ultrasonic irrigation (CANUI), a new irrigation concept, and compare the characteristics of this new technique with current devices for activating the irrigant. MATERIAL AND METHODS CANUI is designed for cleaning and disin...

This paper presents an integrated high temperature ultrasonic transducer (HTUT) on a sensor insert and its application for real-time diagnostics of the conventional hot embossing process to fabricate V-cut patterns. The sensor was directly deposited onto the sensor insert of the hot embossing mold by using a sol-gel spray technique. It could operate at temperatures higher than 400 °C and uses a...

Present work aims at multi-mechanical surface treatment of Ti-6Al-4V based-miniplate implant manufactured by electrical discharge machining (EDM) for biomedical use. Mechanical surface treatment consists of consequent use of ultrasonic cleaning, rotary tumbler polishing, and brushing. Surface layers are analyzed employing scanning electron microscopy and energy dispersive X-ray spectroscopy. Al...

Milk contaminated with melamine resulted in an important health hazard that affected many babies in China recently. Ultrasonic characterization of adulterated milk may detect gross levels of melamine contamination. Sound speed and density measurements were made in skim milk as a function of melamine adulteration. An ultrasonic measurement technique to implement milk quality control is discussed.

This paper describes a low-cost ultrasonic fusion system for angular position. It makes use of two omnidirectional microphones together with one ultrasonic transmitter. The system enables the determination of the transmitter with respect to the two omni-directional microphones. The technique used for the estimation of the incident angle è is the sum-and-difference monopulse method.