Abstract. The laser based ultrasonic technology allows assessing checking and measuring the properties of several materials without contact and in harsh conditions (high temperature, high speed...). In Arcelor Research, we integrated a laser-based ultrasonic equipment to an annealing simulation pilot in order to monitor in real time and in-situ the evolution of the microstructure of steel sampl...

In the past, components under fatigue loading were designed by using an S-N curve and endurance limit according to very high cycle fatigue tests [1-3], fatigue strength to failure at a given life decreases as loading cycles increase. In other words, endurance limit is not observed for most materials, which is true for axle materials for rolling stock. An axle is one of the key components for st...

This paper reports on an ultrasonic measurement system and its application for in situ real-time measurement of very fast regression rates (>200 mm/s) of the melting interface (RRMI) produced when burning particular metals such as aluminium at high pressures. The RRMI is referred to as the rate at which a solid/liquid interface moves along a metallic rod while burning in an oxygen-enriched atmo...

Ultrasound is a well-established method for particle size reduction in dispersions and emulsions. Ultrasonic processors are used in the generation of nano-size material slurries, dispersions and emulsions because of the potential in the deagglomeration and the reduction of primaries. These are the mechanical effects of ultrasonic cavitation. Ultrasound can also be used to influence chemical rea...

Schlieren visualization is one of the simplest ways of determining the geometric parameters of an ultrasonic beam generated by diagnostic transducers, and is recommended for evaluating the potential and the limitations of ultrasonic equipment used in diagnostic applications.’ Apart from some special cases, for example, dynamically focused and/or scanned receiving arrays, the shape of the transm...

This paper presents the development of inspection strategies dedicated to the quality insurance of the wind turbine blade manufacturing process and in particular the inspection of the adhesive bondlines. Ultrasonic testing is recognized as a technique that can provide valuable information about the structure. Porosity, dry area and delamination can be detected and characterized in laminates. La...

Two surgical cases are presented in which retrograde instrumentation of the root canal was accomplished with sonic or ultrasonic instruments. The canals were obturated from a retrograde direction with thermoplasticized gutta-percha and root canal sealer. Success of these treatment approaches is attributed to thorough debridement and satisfactory obturation with equipment only recently available...

PURPOSE Assess prevalence of self-reported hearing difficulties among experienced dental hygienists who have been practicing for a minimum of 20 years and explore the relationship between hearing difficulties and occupational noise exposure from ultrasonic scalers. METHODS A 19-item survey was mailed to a random sample of 1,067 dental hygienists who had obtained their California licenses betw...

The most crucial problem for the mobile robot navigation is obstacles detection and their localization. The determination of obstacle position should be as accurate as possible in order to support robot self-localization procedures. In order to increase its efficiency the recognition of some feature of obstacles shapes should be done. The most advanced systems use laser range-finder and vision ...

Four hundred fifty-two yearling steers from two experiments were measured for subcutaneous fat thickness and longissimus muscle area between the 12th and 13th ribs using real-time linear array ultrasound equipment. Ultrasonic predictions were compared to corresponding carcass measurements to determine accuracy of ultrasound measurements. In Exp. 1, 74% of the ultrasonic estimates of fat thickne...