Abstract
As the technology of high-speed data acquisition evolves along with the ability to record multi-megabyte continuous streams of data, the application of pulse-echo ultrasound to transient measurements have become possible. I will discuss a system that has been developed at the National High Magnetic Field Laboratory for measurements of sound speed and attenuation in materials subjected to intense pulsed magnetic fields. The magnetic field pulses have millisecond durations and can only be repeated a few times a day. We are able to process from a single magnetic pulse, a record of sound speed that reveals structural changes as a function of magnetic field. We are not alone in this effort; at least two other groups at other high magnetic field laboratories are using similar techniques [C. Proust et al., Lab. National des Champs Magnetiques Pulses, Toulouse France, UMR 5147CNRS-INSA-UPS; Wolf et al., ‘‘New Experimental Techniques for Pulsed Magnetic Fields-ESR and Ultrasonics,’’ Physica B 294–295, 612–17 (2001)]. This presentation is intended to acquaint the audience with the techniques of setting up a pulse-echo ultrasound system by taking advantage of modern digitizing systems available and computer based post processing using commercially available application software. I will present data from experiments that we have carried out and discuss the precision with which the sound speeds can be determined.
Published Version
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