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Publications

Materials Evaluation 01/2021

Laser-Excited Acoustics for Contact-Free Inspection of Aeropace Composites

Authors:

Matthias Brauns, Fabian Lücking, et.al.

Contents:
  • XARION published an article in “Materials Evaluation” together with Northrop Grumman Corp. introducing LEA NDT, Laser-Excited Acoustics for contact-free inspection of aerospace composites
  • LEA is a novel and fast ultrasound scanning technique with properties that make it an affordable couplant-free alternative for NDT of a variety of aerospace composite materials
  • For further information concerning the article please contact us
Link

Proceedings of IEEE International Ultrasonics Symposium 2020 Las Vegas 09/2020

Polymer-based piezoelectric ultrasound transducer arrays on glass demonstrating mid-air applications

Authors:

Christopher Chare, Pieter Gijsenbergh, et. al.

Contents:
  • The acoustic field of an ultrasound transducer array was measured using XARION's technology in order to characterize the performance of the array
  • With a measured acoustic focal pressure of 300 Pa (144 dB rel. 20µPa) at 256 kHz, 10 mm above the surface, IMEC opens up the possibility of future mid-air haptic feedback applications for large-area thin-film displays
PDF

Proceedings of IEEE Sensor 2020 Rotterdam 10/2020

Enhanced non-contact ultrasonic testing using an air-coupled optical microphone

Authors:

Georg Kaniak, Wolfgang Rohringer, et. al.

Contents:
  • Contact-free scan of a fully packaged chip (Hall sensor) with the optical microphone
  • Evaluation of small ceramic parts by air-coupled measurement of acoustic response to a laser pulse
PDF

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
PDF

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
PDF

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
PDF

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 
PDF

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
PDF

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
PDF

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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