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Publications

Proceedings of Transducers 2019 Berlin 

Display Compatible PMUT Array for Mid-Air Haptic Feedback

Authors:

Alexandre Halbach, Pieter Gijsenbergh, et al.

Contents:
  • Optical microphone used in development of mid-air haptic feedback sensors integrated into displays
  • Sound pressure characterization of 32 x 32 element piezoelectric micromachined ultrasound transducer (PMUT)
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Sensors 07/2019

Intensity Modulated Photothermal Measurements of NO2 with a Compact Fiber-Coupled Fabry–Pérot Interferometer

Authors:

Philipp Breitegger, Benjamin Lang, et al.

Contents:
  • Measurement of nitrogen dioxide concentrations in parts per billion
  • The optical microphone enables a miniaturized sensing concept, providing outstanding robustness against mechanical vibrations
PDF

Journal of Micromechanics and Microengineering  07/2019

Characterization of polymer-based piezoelectric micromachined ultrasound transducers for short-range gesture recognition applications

Authors:

Pieter Gijsenbergh, Alexandre Halbach, et al.

Contents:
  • The Interuniversity Microelectronics Centre investigated the use of polymer-based piezoelectric micromachined ultrasound transducers (PMUT) for short-range gesture recognition applications
  • During the course of the project the optical microphone was used to measure the pressure emitted by a single PMUT at various distances
PDF

Proceedings of SCMT5 2019 London 

Material characterization via contact-free detection of surface waves using an optical microphone

Authors:

Wolfgang Rohringer, Nils Panzer, et al.

Contents:
  • Single-sided non-contact measurements of a spot-welded steel plate, an aluminium plate and on a sandstone sample
  • The results demonstrate the ability of XARION's technology on a wide range of surfaces and materials
PDF

Bachelor Thesis University Ravensburg-Weingarten 

Acousto-optical Process Control for Laser Ablation and Laser Welding

Authors:

Chen Peng

Contents:
  • The optical microphone has proven effective and invaluable as a measurement instrument during laser processes.
  • The measurements obtained are useful in:
    • the automated calibration of the optimum focus spot of a laser beam,
    • controlling the laser ablation quality in a production line without modifying the workpiece, and
    • identifying keyhole formation (or lack thereof) during laser welding processes. 
PDF

LASER 06/2019

Akustische Überwachung für die Lasermaterialbearbeitung (German)

Authors:

Christian Schröter, Ryan Sommerhuber, et al.

Contents:
  • Contact-free monitoring of laser welding, cutting and structuring
  • Real-time determination of ideal focus position and unwanted zinc contamination
PDF

Proceedings of DAGA 2019 Rostock  

Air-Coupled Ultrasonic Inspection of Fiber-Reinforced Plates Using an Optical Microphone

Authors:

Janez Rus, David Kulla, et al.

Contents:
  • Inspection of  fiber-reinforced plates with the optical microphone and classical air-coupled ultrasound devices
  • Result: the XARION technology shows a better spatial resolution than state-of-the-art piezoelectic receivers
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Ceramic Industry 02/2019

Non-Contact Ultrasound Diagnostics for the Ceramic Industry

Authors:

Fabian Lücking

Contents:
  • Detection of tiny cracks in ceramic workpieces with the help of XARION's optical microphone
  • Monitoring of acoustic emissions without the need for physically contacting the workpiece 
PDF

Composite Structures 12/2018

Impact damage assessment in biocomposites by micro-CT and innovative air-coupled detection of laser-generated ultrasound

Authors:

Balthasar Fischer, Fabrizio Sarasini, et al.

Contents:
  • Joint publication of XARION, Airbus Operations S.A.S, Università di Roma and CNRS-ENSMA
  • Superior inspection resolution was achieved with the optical microphone and laser-based excitation
PDF

Elektrotechnik und Informationstechnik 11/2018

Development of an innovative measurement system for audible noise monitoring of overhead lines

Authors:

U. Schichler, W. Troppauer et al.

Contents:
  • Audible noise monitoring of overhead lines with XARION's optical microphone
  • Operation in proximity of high electric fields without interferences 
PDF