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Publications

Ultrasonics 09/2020

Thickness measurement via local ultrasonic resonance spectroscopy

Authors:

Janez Rus, Christian U. Grosse

Contents:
  • Local mechanical response to laser-induced ultrasound was recorded with XARIONs optical microphone in order to measure the thickness of a carbon fiber-reinforced polymer plate
  • The precision of this arrangement greatly exceeded the precision of conventional methods due to the unique frequency bandwidth of the optical microphone
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LANE 2020

Proceedings of LANE 2020 Erlangen 

In situ process monitoring by optical microphone for crack detection in Laser Metal Deposition applications

Authors:

Camilo Prieto, Roberto Fernandez, et.al.

Contents:
  • Contact-free crack detection in Laser Metal Deposition (LMD) applications in collaboration with AIMEN successfully documented
  • XARION’s optical microphone, Eta250 Ultra, enabled real-time monitoring of crack and process signals of additive manufacturing applications
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Journal of Composite Materials 06/2020

Qualitative comparison of non-destructive methods for inspection of carbon fiber-reinforced polymer laminates

Authors:

Janes Ruz, Alex Gustschin, et.al.

Contents:
  • Thirteen different non-destructive methods were compared and qualitatively characterized
  • XARIONs Optical Microphone is the only couplant-free method that was tested that allowed an inspection in the MHz-range
  • The very good spatial resolution of the Optical Microphone was verified
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Biomedical Optics Express 04/2020

Functional optical coherence tomography and photoacoustic microscopy imaging for zebrafish larvae

Authors:

Richard Haindl, Abigail J. Deloria, et.al.

Contents:
  • A non-invasive imaging technology with the optical microphone is applied to Zebrafish larvae
  • Results demonstrate the capability to image not only the shape of smallest micron-sized vessels, but also blood flow and oxygen saturation
  • These parameters are essential in preclinical physiological and drug response studies 
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Journal of Nondestructive Evaluation 03/2020

Local Ultrasonic Resonance Spectroscopy: A Demonstration on Plate Inspection

Authors:

Janez Rus, Christian Grosse

Contents:
  • Local ultrasonic resonance spectroscopy (LURS) is a new approach to ultrasound signal analysis
  • XARION’s ultrasonic sensor was used for a LURS scan of a carbon fiber reinforced polymer plate. An advantage in characterizing the features of the specimens could be demonstrated
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Proceedings of SPIE LASE 2020 San Francisco 

Air-coupled membrane-free optical microphone and optical coherence tomography keyhole measurements to setup welding laser parameters

Authors:

Nicolas Authier, Enzo Touzet, et. al.

Contents:
  • Accurate measurements of the welding depth could be demonstrated with XARION's sensor by the French Alternative Energies and Atomic Energy Commission (CEA)
  • The combination of Optical Coherence Tomography with airborne ultrasound data from an Optical Microphone is a promising match for in-line monitoring of laser welding processes
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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
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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
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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
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