Abstract
High-frequency transducers up to 50MHz were developed for resonant ultrasound spectroscopy (RUS). The transducers were carefully designed as composites of high-Q (>100) and low-Q (<100) materials in order to be able to distinguish the resonant peaks of samples from the instrumental background. Combining the transducers with a high performance lock-in amplifier enabled us to conduct RUS of a specimen as small as ̃0.2 mm. One of the features of a lock-in amplifier is its ability to measure the phase of a resonance signal against the reference signal. We utilized this to subtract background noise and to decompose peaks that overlapped at a small frequency interval. The present experimental and analytical developments are useful for obtaining the elastic constants of high-pressure phases of minerals from sub millimeter single-crystal grains synthesized in a high-pressure apparatus.
Original language | English |
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Pages (from-to) | 7898-7903 |
Number of pages | 6 |
Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
Volume | 46 |
Issue number | 12 |
DOIs | |
Publication status | Published - Dec 6 2007 |
Keywords
- Acoustic signal processing
- Acoustical instruments and techniques
- Background subtraction
- Lock-in amplifier
- Resonant ultrasound spectroscopy
- Transducers
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)