Related Experiment Video
Updated: Jan 29, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Low-loss ultrasound transmission through glass assisted by resonance
Hallvard Angelskår1, Christopher Andrew Dirdal1, Tron Vedul Tronstad2
1SINTEF Digital, Dept. of Microsystems and Nanotechnology, Gaustadalléen 23C, 0373 Oslo, Norway.
Abstract:
We have investigated transmission of ultrasound signals from a speaker in air through a 400 µm thick borosilicate glass plate, similar to those found in consumer electronics products such as mobile phones and tablets. In order to enhance transmission, we took advantage of resonances in the glass plate and a cavity, which is placed between the glass and the microphone. The results show that it is possible to achieve transmission of a signal with bandwidth of approximately 5 kHz with less than -10 dB attenuation, and only -2 dB attenuation at the resonance peak frequency. With more optimized assembly the attenuation can be further reduced. Finite element simulations and analytical considerations show that there are two main resonance peaks, attributed to the glass resonance and cavity resonance, respectively. The geometry can be tuned to exploit the synergy of these two resonances in order to tailor the peak frequency, the bandwidth and to optimize transmission.
More Related Videos
09:20Microwave Assisted Rapid Diagnosis of Plant Virus Diseases by Transmission Electron Microscopy
Published on: October 14, 2011
07:44Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
Published on: April 27, 2016
Related Concept Videos
The Looking Glass Self
Resonance
Line Loss
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
Reducing Line Loss
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
Energy Losses in Transformers
There are four main reasons for energy losses in transformers.
The first cause can be the high resistance of the...
Major Losses in Pipes
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...