Cones and wedges inserted between an ultrasonic transducer and the specimen provide the transducer (circular or rectangular shape) with enhanced capability for point or line contact with the specimen. Such an arrangement is useful in that the transducer can be used for transmitting to and receiving from a point (or line) source, and that it can eliminate the undesirable aperture effect that mak...

A novel ultrasonic steel horn with a Bézier profile is developed. The first longitudinal displacement mode of the horn is exploited for high displacement amplification. An optimization scheme and finite element analyses are used to design the horn. The displacement amplification and stress distribution characteristics of the Bézier horn and catenoidal horn are examined. Prototypes of the horns ...

Pulsed Ultrasonic Velocimetry, commonly referred to as Ultrasonic Velocity Profiling (UVP) in research and engineering applications, is both a method and a device to measure an instantaneous one-dimensional velocity profile in opaque fluids along a measurement axis by using Doppler echography. Studies have suggested that the accuracy of the measured velocity gradient close to wall interfaces ne...

Abstract In order to solve the problem of cleaning complex surfaces and micro blind holes in industrial products, a small high frequency ultrasonic transducer was designed tested. Firstly, finite element model established, influence structural parameters on first longitudinal vibration analyzed. By adjusting transducer, determined be 58716hz.The harmonic response The results showed that when vo...

Metal structures can fail because of fatigue crack propagation or because of section loss from corrosion. Regular inspection is required to intercept such failures, and in situ sensors would be a superior technology for that purpose. We have designed and fabricated arrays of MEMS capacitive diaphragm transducers and we report on their performance as pulse-echo detectors in direct contact with s...

to establish the location and shape of a Iiquid/vapor interface in a liquid container, thus enabling liquid A demonstration system for the ultrasonic gauging of volume measurement [I,21. fluids in low-gravity has been designed and tested. For purposes of simplification, it was assumed that vapor Typically, in propellant storage applications, the liquid within a liquid container in low-gravity w...

Ultrasonic measurements are used in civil engineering for structural health monitoring of concrete infrastructures. The late portion the ultrasonic wavefield, coda, is sensitive to small changes elastic moduli material. Coda Wave Interferometry (CWI) correlates these coda with wavefield recorded intact, or unperturbed, specimen reveal amount velocity change that occurred. CWI has potential dete...

In ultrasonic medical imaging, spatial compounding of images is a technique where ultrasonic beam is steered to examine patient tissues in multiple angles. In the conventional ultrasonic diagnostic imaging, the steering of the ultrasonic beam is achieved electronically using the phased array transducer elements. In this paper, a spatial compounding approach is presented where the ultrasonic pro...

An ultrasonic transducer is incorporated into a near-field scanning optical microscope NSOM to augment its versatility to characterize the properties of layers adsorbed to a sample’s surface. Working under typical NSOM operation conditions, the ultrasonic transducer—attached underneath the sample—demonstrates sufficient sensitivity to monitor the waves generated by the tapered NSOM probe that o...

Based on investigations with an ESEC thermosonic wire bonder, we report a novel ultrasound calibration method which consists of measuring in-situ the friction heat generated by the gold ball as it scrubs on the oxide of an integrated microsensor. This procedure can be carried out in-process using a dedicated testchip and a modiÞed clamping plate. The calibration dependence on the process parame...