Resonant ultrasound spectrometer
First Claim
1. An ultrasound resonant spectrometer for use with a rectangular parallelepiped sample of a high dissipation material having an expected resonant response frequency range, comprising:
- a sample holder structure for contacting corner portions of said sample;
a drive transducer assembly and a receive transducer assembly mounted on said holder for contacting said sample corner portions;
said drive and receive transducer assemblies including a piezoelectric transducer mounted on a membrane for weakly coupling said transducer to said sample holder structure and operatively contacting a material effective to remove system resonant responses at said transducer from said expected sample resonant response frequency range, effectively exciting an output response of said sample from said receive transducer assembly as said drive transducer assembly excites said sample over said expected resonant response frequency range.
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Accused Products
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.
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Citations
8 Claims
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1. An ultrasound resonant spectrometer for use with a rectangular parallelepiped sample of a high dissipation material having an expected resonant response frequency range, comprising:
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a sample holder structure for contacting corner portions of said sample; a drive transducer assembly and a receive transducer assembly mounted on said holder for contacting said sample corner portions; said drive and receive transducer assemblies including a piezoelectric transducer mounted on a membrane for weakly coupling said transducer to said sample holder structure and operatively contacting a material effective to remove system resonant responses at said transducer from said expected sample resonant response frequency range, effectively exciting an output response of said sample from said receive transducer assembly as said drive transducer assembly excites said sample over said expected resonant response frequency range. - View Dependent Claims (2, 3, 4, 5)
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- 6. In an ultrasound resonant spectrometer having a sample holder structure for contacting corner portions of a rectangular parallelepiped sample, a drive transducer assembly and a receive transducer assembly effective for contacting samples of low dissipation materials, said drive and receive transducer assemblies including a transducer mounted on a membrane for weakly coupling said transducer to said sample holder structure and operatively contacting a material effective to remove system resonant responses at said transducer from the expected sample resonant response frequency range.
Specification