Resonant ultrasound spectrometer

Patent · Mon Jan 01 04:00:00 EST 1990

OSTI ID:867631

Migliori, Albert ^[1]; Visscher, William M ^[2]; Fisk, Zachary ^[1]

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1. Santa Fe, NM
2. Los Alamos, NM

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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM
• DOE Contract Number: W-7405-ENG-36
• Assignee: United Stated of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 4976148
• OSTI ID: 867631
• Country of Publication: United States
• Language: English

Related Subjects

/73/310/702/
amplifier
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contacts
corners
coupling
damping
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detector
determines
diamond
dissipation
divider
drive
effective
effects
elastic
electric drive
enable
expected
extremely
extremely sensitive
frequencies
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grips
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material
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operatively
parallelepiped
piezoelectric
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powder
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range
receive
receives
rectangular
rectangular parallelepiped
remove
resonance
resonant
resonant frequency
resonant response
resonant ultrasound
response
response range
response signal
responses
retransmits
sample
sample holder
sensitive
shield
signal
spectrometer
spectrometer determines
spectrum
square-law
structure
substantially
transducer
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ultrasound
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weakly