The properties of Sb-based III-V semiconductor compounds for optoelectronic applications in the mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) range were reviewed. The growths of the Sb-based binary, ternary and quaternary were studied by molecular beam epitaxy (MBE) and metalorganic chemical vapor deposition (MOCVD). The structural, optical and electrical characterizations were carried out. Focal plane array, photoconductors and photodiodes were fabricated for the MWIR and LWIR range. Doublehetero structure (DH), multi-quantum well (MQW) and strained superlattice (SSL) lasers in the 3–5 μm range were fabricated. InAs-GaSb type-II superlattices were designed, grown and fabricated into photodetectors for the MWIR and LWIR range.

Materials such as glasses, insulated foams, polymers are semi-transparent. In order to measure the phononic diffusivity of such media – in which the heat transfer is both conductive and radiative – it is necessary to develop a complete methodology. The technique, we propose here, is an extension of the Flash method with the use of a semi-analytical combined model. It permits to determine the diffusivity of materials such as glass and silica for a large range of temperature (from 300 K to 700 K).

The aim of this work is to study and design a NMR micro antenna dedicated to ultrasound lesion monitoring by imaging. This micro-antenna will be associated with an oesophageal ultrasound applicator used for oesophagus tumour therapy to provide guidance and monitoring by magnetic resonance imaging (MRI). So, the micro-antenna design was guided by size and shape constraints due to endocavitary applications and adaptation to the ultrasound applicator. In this scope, a coil of N rectangular loops was built. In order to minimise size and offer the ability to perform in vivo adjustments, remote tuning and matching was performed. MRI investigations were carried out using two antennas: a volumic transmitter coil for excitation and this endoscopic receiver coil for signal capture. Lesion can be clearly seen on T2-weighted MR imaging. Lesion measurements on sagittal and axial slices gave a good correlation with lesion dimensions measured on sample.

A photothermal microscope devoted to microscopic thermal and thermo-elastic characterizations is presented. In thermal configuration, the sample is heated by an intensity modulated laser beam and the periodic temperature increase at the sample surface is detected using the photoreflectance technique. In thermo-elastic configuration, the periodic elevation of the sample surface is measured using a Nomarski interferometer. The spatial resolution is micrometric, the sensivity is better than 10−3 K/ $\surd$ Hz in thermal configuration and 10 pm/ $\surd$ Hz in the interferometric one. Typical photoreflectance thermal properties measurements are performed to evaluate the performance of the instrument. In thermo-elastic configuration, the interferometric signal has to be carefully analyzed to remove spurious photothermal effects. The thermo-elastic response of isotropic and anisotropic homogeneous samples during modulated photothermal experiments are then calculated to demonstrate that interferometric measurements enable quantitative determination of some of the sample thermo-elastic parameters such as thermal diffusivity, elastic anisotropy and crystalline orientation.

This paper presents a non destructive evaluation systemfor rail inspection with a device embedded in a subway train. Thedifficult operating conditions lead to the design of a specificdouble-coils and double-frequencies sensor that delivers 8complementary signals. After the presentation of the technologicalsolution, the paper deals with the detection of minor defects andpresents three approaches: the first one is a time heuristicapproach, the second one is based on wavelet basis projections,and the last one implements an inverse filtering which allows thetransformation of the differential probe outputs into estimatedabsolute ones. The methods are validated statistically on alabeled defect data set with the help of ROC curves.