Non-Destructive Testing

Sensors 2025 – MDPI  03/2025

Non-Contact Laser Ultrasound Detection of Internal Gas Defects in Lithium-Ion Batteries

Authors:

Dongxia Tang, Chenguang Xu, Guidong Xu, Sen Cui and Sai Zhang

Contents:

• Gas defects in Lithium-Ion Batteries reduce their capacity and increase their internal resistance by loss of active material.
• This paper demonstrates the contact-free ultrasonic inspection of gas defects in pouch cells using XARION's Optical Microphone.
• Results show that C-Scans generated by XARION match the resolution of contact-based scanning acoustic microscopy.

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Springer 03/2025

Handbook of Nondestructive Evaluation 4.0

Authors:

Norbert Meyendorf, Nathan Ida, et.al.

Contents:

• This handbook is a comprehensive overview of advanced NDE technologies for use in many different industrial applications
• XARION is represented with a chapter on its innovative automated spot-weld inspection technology

Link

Nature Communications 11/2023

Ultrasonic barrier-through imaging by Fabry-Perot resonance-tailoring panel

Authors:

Chung Il Park, Seungah Choe, et al.

Contents:

• Ultrasonic imaging through nearly impenetrable metal barriers or the human skull remains an unresolved challenge
• Applying a Fabry-Perot resonance approach and resonance tailoring panels the authors show that ultrasonic transmission through otherwise impenetrable barriers can be achieved
• XARION's optical hydrophone (Eta100L Ultra) was employed to capture ultrasonic signals in the experiments
• The newly developed method enables almost equivalent image quality as without barriers and has the potential to improve ultrasonic imaging

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ICCM23 – International Conference on Composite Materials August 2023

Contact-Free Porosity Detection in Composite Parts by a Pore Resonance Mechanism

Authors:

M. Fuerst, M. Brauns, D. Bujdo, N. Panzer, B. Mauel, M. Dambaur, B. Fischer

Contents:

• In collaboration with Airbus Helicopters Deutschland, XARION's Laser Excited Acoustics (LEA) technology was applied for fully contact-free porosity inspection of CFRP components, eliminating the need for couplants and immersion tanks.
• XARION's broadband Optical Microphone (50 kHz – 2 MHz) detects laser-generated ultrasound through air, enabling reliable measurements independent of surface reflectivity, roughness, or part geometry.
• In addition to the attenuation-based standard method, LEA can also exploit pore resonances to enhance the signal at defect locations, enabling both high-contrast imaging and direct pore sizing (270–530 µm) from the resonance frequency alone.
• This pore resonance mechanism delivers high-resolution mapping of porosity distributions fully contact-free, making it a highly relevant solution for the inspection of CFRP parts in the aerospace industry.

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NDT & E International 10/2025

Elastic wave dispersion for heterogeneity characterization in cement-based media

Authors:

Nicolas Ospitia, Dimitrios G. Aggelis and Gerlinde Lefever

Contents:

• The study uses elastic wave dispersion to analyze heterogeneities in cement-based materials.
• XARION’s air-coupled, broadband, resonance-free Optical Microphone was applied, capturing ultrasonic dispersion with exceptional clarity – without contact to the specimen.
• The analysis of the recorded waves allows identification of regions with differing mechanical properties, void sizes, and microstructural damage.
• The results demonstrate how wave dispersion correlates with material heterogeneity, providing a quantitative basis for characterization and new possibilities for concrete diagnostics.

Science direct

Composite Structures 10/23

Low-velocity impact behaviour of biocomposite laminates reinforced by flax, basalt and hybrid fibres at various temperatures: Analytical, numerical and experimental results

Authors:

Valentina Giammaria, Simonetta Boria, Josef Pörnbacher, et.al.

Contents:

• The impact behavior of bio-composites reinforced with flax, basalt and hybrid fibers was investigated
• XARION’s LEA method was used to assess the internal damage of the composites after impact

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

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 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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