Ultrasonic non-destructive testing is an effective means of examining objects without destroying them. Among such testing, ultrasonic nonlinear evaluation used to detect micro-damage, as corrosion or plastic deformation. In terms micro-damage evaluation, the data that comes from amplitude comparison in frequency domain plays a significant role. Its technique and parameter are called nonlinearit...

IT is often difficult to locate an intra-ocular foreign body. Sometimes it may be seen and localized by biomicroscopy, ophthalmoscopy, gonioscopy, or diaphanoscopy. Yet radiological examination is necessary in every case, because the foreign body seen by the foregoing methods is not invariably the only one present in the eye. Although x-ray methods (Comberg, Dixon, Goldmann and Bangerter, Sweet...

Conventional ultrasonic transducers cannot withstand high temperatures for two main reasons: the piezoelectric elements within them depolarize, and differential thermal expansion of the different materials within a transducer causes them to fail. In this paper, the design of a high-temperature ultrasonic thickness gauge that bypasses these problems is described. The system uses a waveguide to i...

development of ultrasound technique has not been progressing for evaluating the internal quality of fruits as fast as that of processed foods. in this research for quality assessment of pear fruit (shah miveh variety) an ultrasonic measurement system was constructed to transmit and receive the ultrasonic waves. the apparatus included a pulser-receiver, a pair of 75 khz ultrasonic transducers wi...

In electrical power engineering equipment like cables, transformers and switchgears high voltages occur which have to be isolated in a safe and reliable way. Thus the used insulation systems are very sensitive parts of such components, especially regarding the long required lifetime of more than 30 years. Especially for insulation systems made up of solid materials (resins, elastomers, thermopl...

The complex problems of predicting adhesive bond strength for both adhesive and cohesive defects have been studied usinq an ultrasonic, experimental test bed system. This experimental test bed incorporates the ultrasonic and computer equipment necessary to acquire and process data from various types of adhesively bonded test specimens. The computer hardware and software have been developed to a...

We are developing a new method using ultrasonic longitudinal and torsional vibration of a hollow-type stepped horn for hole machining. We foresee that the equipment can be simplified and miniaturized. In this paper, ultrasonic vibration sources of a hollow-type stepped horn without a diagonal slits vibration converter and with a diagonal slits vibration converter are used. The longitudinal and ...

Corrosion in pipe work is a major problem. While most plants have reliable information on most equipment, the least data available is always with respect to their piping. Significant portions of plant piping and pipelines are insulated or buried and hence, even external corrosion cannot be readily observed. Ultrasonic guided waves in the pipe wall provide an attractive solution as the waves are...

One of the mechanisms often suggested for the biological action of ultrasonic beams irradiating human tissues is concerned with the presence in the tissues of minute gaseous bubbles which may, under the influence of the ultrasonic field be stimulated to grow to a size a which resonance or collapse occurs with severe associated shear stresses. The evidence for the existence of microbubbles in ti...