Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1989-09-12
1990-12-11
Williams, Hezron E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
310327, 73602, 364508, G01N 2912
Patent
active
049761480
ABSTRACT:
An ultrasound resonant spectrometer determines the resonant frequency spectrum of a rectangular parallelepiped sample of a high dissipation material over an expected resonant response frequency range. A sample holder structure grips corners of the sample between piezoelectric drive and receive transducers. Each transducer is mounted on a membrane for only weakly coupling the transducer to the holder structure and operatively contacts a material effective to remove system resonant responses at the transducer from the expected response range. i.e., either a material such as diamond to move the response frequencies above the range or a damping powder to preclude response within the range. A square-law detector amplifier receives the response signal and retransmits the signal on an isolated shield of connecting cabling to remove cabling capacitive effects. The amplifier also provides a substantially frequency independently voltage divider with the receive transducer. The spectrometer is extremely sensitive to enable low amplitude resonance to be detected for use in calculating the elastic constants of the high dissipation sample.
REFERENCES:
patent: 4607341 (1986-08-01), Monchalin
I. Ohno, "Free Vibration of a Rectangular Parallelepiped Crystal and Its lication to Determination of Elastic Constants of Orthorhombic Crystals," 24 J. Phys. Earth, pp. 355-379 (1976).
T. Goto et al., "An Apparatus for Measuring Elastic Constants of Single Crystals by a Resonance Technique Up to 1,825 K." Unpublished (1988).
Fisk Zachary
Migliori Albert
Visscher William M.
Finley Rose
Gaetjens Paul D.
Moser William R.
The United Stated of America as represented by the Department of
Williams Hezron E.
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