Improving sample preheating capabilities for dynamic loading on high-pulsed power drivers.

The CEA operates several High-Pulsed Power (HPP) drivers for dynamic loading experiments. The aim of these experiments is to provide quantitative information about the response of various materials of interest, mainly under quasi-isentropic compression. In order to improve our ability to explore these materials' behavior over a wide range of thermodynamic paths and starting from various non-ambient conditions, we developed a device capable of pre-heating both metallic and nonmetallic samples up to several hundred degrees prior to loading.

Nondestructive testing of resistance spot welds using eddy current thermography.

The paper presents the use of eddy current thermography for detecting cracks in resistance spot welds. The sample is a three-sheet stack-up joined together by welding spots. Inductive Helmholtz coil is used for heating up the sample, and the thermal response of each spot is monitored using a cooled indium antimonide camera.

The use of the green emission in Er(3+)-doped CaF(2) crystals for thermometry application.

We report here the use of the green upconversion emissions originating from the thermally coupled levels (2)H(11/2) and (4)S(3/2) of the Er(3+) ion in CaF(2):Er (0.01 at.%) for thermometry application in the range 303-423 K.