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  4. Broadband Air-Coupled Ultrasound Emitter and Receiver Enable Simultaneous Measurement of Thickness and Speed of Sound in Solids
 
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research article

Broadband Air-Coupled Ultrasound Emitter and Receiver Enable Simultaneous Measurement of Thickness and Speed of Sound in Solids

Bente, Klaas
•
Rus, Janez  
•
Mooshofer, Hubert
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February 1, 2023
Sensors

Air-coupled ultrasound sensors have advantages over contact ultrasound sensors when a sample should not become contaminated or influenced by the couplant or the measurement has to be a fast and automated inline process. Thereby, air-coupled transducers must emit high-energy pulses due to the low air-to-solid power transmission ratios (10(-3) to 10(-8)). Currently used resonant transducers trade bandwidth-a prerequisite for material parameter analysis-against pulse energy. Here we show that a combination of a non-resonant ultrasound emitter and a non-resonant detector enables the generation and detection of pulses that are both high in amplitude (130 dB) and bandwidth (2 mu s pulse width). We further show an initial application: the detection of reflections inside of a carbon fiber reinforced plastic plate with thicknesses between 1.7 mm and 10 mm. As the sensors work contact-free, the time of flight and the period of the in-plate reflections are independent parameters. Hence, a variation of ultrasound velocity is distinguishable from a variation of plate thickness and both properties are determined simultaneously. The sensor combination is likely to find numerous industrial applications necessitating high automation capacity and opens possibilities for air-coupled, single-side ultrasonic inspection.

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Type
research article
DOI
10.3390/s23031379
Web of Science ID

WOS:000931082300001

Author(s)
Bente, Klaas
•
Rus, Janez  
•
Mooshofer, Hubert
•
Gaal, Mate
•
Grosse, Christian Ulrich
Date Issued

2023-02-01

Publisher

MDPI

Published in
Sensors
Volume

23

Issue

3

Article Number

1379

Subjects

Chemistry, Analytical

•

Engineering, Electrical & Electronic

•

Instruments & Instrumentation

•

Chemistry

•

Engineering

•

thermoacoustic emitter

•

optical microphone

•

air-coupled ultrasound

•

local resonance

•

thickness measurement

•

thickness resonance

•

transducers

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LWE  
Available on Infoscience
March 13, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/195822
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