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Publications

Inline Process Monitoring

12th International Electric Drives Production Conference (EDPC) 01/23

Inline Process Monitoring of Hairpin Welding Using Optical and Acoustic Quality Metrics

Authors:

Markus Omlor, Johannes Reith, et.al.

Contents:
  • XARION´s Optical Microphone was used to capture airborne ultrasound generated during the hairpin welding process
  • A multitude of welds were performed under varying quality-affecting parameter conditions, such as positioning misalignments or focal height and laser power deviations
  • It was found that the real-time ultrasound emission could be utilized as an early indicator for predicting the important quality criterium of final cross-sectional area of connection
Link

Proceedings of LANE 2022 Erlangen 09/2022

Monitoring of remote laser processes using air-coupled ultrasound

Authors:

R. Sommerhuber, M. Kettner

Contents:
  • XARION’s optical microphone was used for contact-free monitoring of laser processes by comparing the acoustic emissions of the process to known reference signals
  • In this paper, this monitoring method was shown to be able to detect defects and irregularities in the welding of metal sheets and of direct copper bonded substrates
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Real-time measurement of laser beam

Int. J. Adv. Manuf. Technology 08/2022

Real-time measurement of laser beam characteristics for a waterjet-guided laser machine

Authors:

Levent Subasi, Mustafa I. Gokler, Ulas Yaman

Contents:
  • Waterjet-guided laser machining, a novel process used for precision cutting and drilling, was monitored using XARION’s optical microphone
  • Various process parameters, such as the laser power in the water, could be measured more precisely than with other real-time monitoring methods investigated
Link

Composite Structures 05/2022

Effect of basalt intraply hybridization on the damage tolerance of flax laminates: Experimental analysis and analytical modeling under low-velocity impact

Authors:

Elena Raponi, Balthasar Fischer, Josef Pörnbacher et. al.

Contents:
  • Flax, basalt, and hybrid flax/basalt/epoxy composites were subjected to low velocity impact tests to study their toughness
  • The samples were subsequently investigated using XARION’s contact and couplant-free Laser Excited Acoustics (LEA) method
  • The LEA method allowed detection and quantitative assessment of internal damages in the different composites
Link

Tech Briefs 09/2021

Monitoring Additive Manufacturing with an Optical Microphone

Authors:

Martin Ursprung, Ryan Sommerhuber, et.al.

Contents:
  • XARION’s ultrasound sensor enables process monitoring of Additive Manufacturing processes
  • Defects such as the formation of cracks can be detected during Laser Metal Deposition and Powder Bed Fusion processes
  • Critical process parameters can be observed during Wire Arc Additive Manufacturing
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Applied Optics

Applied Optics 08/2021

Depixelation of coherent fiber bundle imaging by fiber-core-targeted scanning

Authors:

Qian Li, Wolfgang Rohringer, et.al.

Contents:
  • A novel method, called Fiber-core-targeted scanning (FCTS), is demonstrated to remove the pixelation artefacts on Fiber-Bundle based laser scanning Photoacoustic Imaging
  • This method is enabled by a XARION hydrophone, which acts as a highly sensitive detector in a fiber-coupled photoacoustic probe suited for future Laparoscopic applications
  • For further information concerning the article please contact us
Link
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
Link
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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