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It is critical to have ultrasonic transducers that are able to produce surface acoustic waves of suitably high frequencies in a wide frequency range of between ten and many hundred megahertz in the ultrasonic non-destructive evaluation of thin films. This level allows the wave to cross the transduceru2013sample interface and spread across the sample's distance of a few millimeters and be accurately identified. SAW by laser Doppler vibrometry vibrometry's electrical characterization and a displacement field analysis are presented. As an example, the characterization of two titanium thin films deposited on silicon is shown.
Source link: https://doi.org/10.3390/s22197464
Sensor design's sensor configuration challenge is the interdigital transducer and signal transmission in a surface acoustic wave pressure sensor configuration. We investigated the relationship between the single-pair interdigital model and the interdigital electrode in this paper. When the bandwidth is accurate, the control matching impedance error is within a u00b1 1u03a9, and it is established that the antenna meets the surface acoustic wave pressure sensor's signal transmission requirement.
Source link: https://doi.org/10.1177/0020294019857744
Wave propagation through the stiffened structures with various stiffener heights is investigated in the first, showing that acoustic propagation characteristics are different from Reusser's model. Acoustic wave propagation paths are becoming more difficult due to acoustic mode conversions. When the stiffeneru2019s heightu2013width ratio was high, the acoustic wave first reached the bottom of the stiffened block and then crept to the top of the stiffened block when the stiffeneru2019s heightu2013width ratio was high. When the stiffeneru2019s heightu2013width ratio was low, the acoustic wave made its way to the incident side of the stiffened block and then propagated separably.
Source link: https://doi.org/10.1063/5.0102477
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