Radio-frequency (RF) electromagnetic emissions from materials under high-frequency mechanical excitation

Direct contact piezoelectric transducers were used to excite compacted polycrystalline dielectric material samples with high amplitude but short duration ultrasound through a frequency range of 50 kHz to 10 MHz, while near field RF emissions were measured in 12 frequency bands from 18 to 750 GHz usi...

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Bibliographic Details
Main Authors: Sorensen, Christian, Moore, David
Format: Conference Proceeding
Language:English
Subjects:
Amplitudes
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Detectors
Emission
Energetic materials
Frequencies
Frequency ranges
Oxidizing agents
Piezoelectric transducers
Piezoelectricity
Radio frequency
Ultrasonic imaging
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Summary:Direct contact piezoelectric transducers were used to excite compacted polycrystalline dielectric material samples with high amplitude but short duration ultrasound through a frequency range of 50 kHz to 10 MHz, while near field RF emissions were measured in 12 frequency bands from 18 to 750 GHz using a suite of detectors. Emissions were observed only in three detectors, covering the 40-75 GHz, 110-170 GHz, and 170-260 GHz frequency ranges. Emission amplitudes appear to rise nonlinearly with applied ultrasound amplitude, and the emission amplitudes versus ultrasound frequency are different than the thermal responses of these samples. Data comparing thermal responses and electromagnetic emissions versus ultrasound frequency and amplitude for several sample types (oxidizers and energetic materials) are reported.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4971525