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Publications

XARION powder bed fusion monitoring

Materials & Design 08/2021

Mutual comparison of acoustic, pyrometric and thermographic laser powder bed fusion monitoring

Authors:

Kai Gutknecht, Michael Cloots, et. al.

Contents:
  • The process monitoring capabilities of three distinctive sensors (XARION’s optical microphone, a pyrometer and a thermographic camera) were compared for laser powder bed fusion metal additive manufacturing
  • The optical microphone presents a sensitivity up to 40 times higher than the thermographic camera and is 15 times more sensitive than the pyrometer
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Publikation LEA NDT

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
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XARION Publikation IEEE

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
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Publikation IEEE Sensor

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
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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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