Time filter

Source Type

Dresden, Germany

Dietze M.,Kiel University of Applied Sciences | Katzke H.,Kiel University of Applied Sciences | Es-Souni M.,Kiel University of Applied Sciences | Neumann N.,InfraTec GmbH | Luo H.-S.,CAS Shanghai Institute of Ceramics
Applied Physics Letters | Year: 2012

We introduce a poling treatment to induce a single domain structure in [111] single crystals of 0.72Pb(Mg 1/3Nb 2/3)O 3-0.28PbTiO 3 (PMN-PT). The properties obtained differ from those known for domain-engineered [111] PMN-PT single crystals. The dielectric, ferroelectric, and pyroelectric properties of this single domain structure are assessed in comparison to polydomain single crystals that were poled by conventional poling treatment. The attributes of the single domain state are a single switching event that reflects in a discontinuity of polarization at the coercive field, a substantially lower dielectric loss (than the multidomain state), and a higher detectivity for pyroelectric applications. © 2012 American Institute of Physics. Source

Agency: Cordis | Branch: FP7 | Program: CP-FP | Phase: AAT-2007-4.1-01 | Award Amount: 2.21M | Year: 2008

The increasing use of composites, sandwich and lightweight structures and parts in new airplanes leads to a need of adapted Non Destructive Testing techniques for such new materials. Various NDT techniques are currently used for flaw detection or mechanical characterization during the development of aerostructures. There is a constant need for improved inspection methods; with increased reliability, rapidity of inspection time and of setting up, and userfriendliness. FANTOM proposes the development of an advanced NDT technique which combines thermography and shearography which are non-contact full-field optical techniques well accepted in the aeronautical sector for composite structures inspection. The combination is envisaged on the basis of a unique measurement technique using a single sensor instead of a classical approach combining separate sensors. The innovative idea is to develop a holography/shearography sensor in the spectral range of thermographic camera, say at long wave infrared light wavelengths. The state-of-art of components (laser, optics, camera) working in that thermal range is such that one can now envisage such developments with high confidence. Therefore, FANTOM is highly relevant to the objective AAT.2007.4.1.1 of decreasing aircraft development costs through advanced testing tools and methods to improve cost-efficiency and reduce testing time in laboratory and on-ground tests. The successive phases of FANTOM are the definition of specifications, the conceptual design, the development of the critical segments (optical hardware, new high resolution infrared camera and a specific data processing which allows decoupling of thermal and strain informations), the building of a laboratory prototype and its validation on certified samples, and finally the industrial validation in structural test facilities of Airbus and service partner.

Li L.,CAS Shanghai Institute of Ceramics | Zhao X.,CAS Shanghai Institute of Ceramics | Li X.,CAS Shanghai Institute of Ceramics | Ren B.,CAS Shanghai Institute of Ceramics | And 9 more authors.
Advanced Materials | Year: 2014

Scaling effects of low-dimensional relaxor ferroelectric single crystals have induced large delocalization of domain switching, leading to a dramatic increase in pyroelectric performances by 2-5.5 times, and promoting the detectivity of fabricated pyroelectric detectors to an international leading level of 2.21 × 109 cmHz1/2/W at 10 Hz, 4 times higher than that of commercial LiTaO3-based detectors. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Alexeenko I.,University of Stuttgart | Alexeenko I.,Immanuel Kant Baltic Federal University | Vandenrijt J.-F.,University of Liege | Pedrini G.,University of Stuttgart | And 4 more authors.
Applied Optics | Year: 2013

We describe three different interferometric techniques (electronic speckle pattern interferometry, digital holographic interferometry, and digital shearography), using a long-wave infrared radiation produced by a CO2 laser and recorded on a microbolometer array. Experimental results showing how these methods can be used for nondestructive testing are presented. Advantages and disadvantages of these approaches are discussed. © 2012 Optical Society of America. Source

Georges M.P.,University of Liege | Vandenrijt J.-F.,University of Liege | Thizy C.,University of Liege | Alexeenko I.,University of Stuttgart | And 5 more authors.
Optics Express | Year: 2014

Holographic interferometry in the thermal wavelengths range, combining a CO2 laser and digital hologram recording with a microbolometer array based camera, allows simultaneously capturing temperature and surface shape information about objects. This is due to the fact that the holograms are affected by the thermal background emitted by objects at room temperature. We explain the setup and the processing of data which allows decoupling the two types of information. This natural data fusion can be advantageously used in a variety of nondestructive testing applications. © 2014 Optical Society of America. Source

Discover hidden collaborations