  Low Concentration Solar Array Experiment on-board PROBA-2; Rossi, Laurence  ; Thibert, Tanguy et alin Proceedings of the 8th Space Power Conference (2008, September) Detailed reference viewed: 74 (24 ULg) Solar concentratorHabraken, Serge ; ; Collette, Jean-Paul Patent (2008) Space solar concentrator with deployable reflectors Detailed reference viewed: 43 (8 ULg)Solar ConcentratorHabraken, Serge ; Defise, Jean-Marc ; Collette, Jean-Paul Patent (2008) A combination of lens and mirror for solar concentration is presented.Collection efficiency, uniformity and compactness are the main goals Detailed reference viewed: 39 (5 ULg)Portable x-ray fluorescence spectrometer for coating thickness measurementCarapelle, Alain ; Fleury-Frenette, Karl ; Collette, Jean-Paul et alin Review of Scientific Instruments (2007), 78(12), A handheld x-ray spectrometer has been realized and tested. The purpose of the device is to measure the thickness of coated samples in the range of 1-1500 nm in an industrial environment. Accuracy of ... [more ▼] A handheld x-ray spectrometer has been realized and tested. The purpose of the device is to measure the thickness of coated samples in the range of 1-1500 nm in an industrial environment. Accuracy of similar to 3% has been achieved in this range with a measurement time of 1 min. Automated software has been implemented to allow utilization by a nonspecialist operator. An automated calibration procedure, based on measurements of reference samples, is used. (C) 2007 American Institute of Physics. [less ▲] Detailed reference viewed: 83 (19 ULg)Quantitative accelerated life testing of MEMS accelerometers; ; et al in sensors (2007), 7(11), 2846 Quantitative Accelerated Life Testing (QALT) is a solution for assessing the reliability of Micro Electro Mechanical Systems (MEMS). A procedure for QALT is shown in this paper and an attempt to assess ... [more ▼] Quantitative Accelerated Life Testing (QALT) is a solution for assessing the reliability of Micro Electro Mechanical Systems (MEMS). A procedure for QALT is shown in this paper and an attempt to assess the reliability level for a batch of MEMS accelerometers is reported. The testing plan is application-driven and contains combined tests: thermal (high temperature) and mechanical stress. Two variants of mechanical stress are used: vibration (at a fixed frequency) and tilting. Original equipment for testing at tilting and high temperature is used. Tilting is appropriate as application-driven stress, because the tilt movement is a natural environment for devices used for automotive and aerospace applications. Also, tilting is used by MEMS accelerometers for anti-theft systems. The test results demonstrated the excellent reliability of the studied devices, the failure rate in the “worst case” being smaller than 10-7h-1. [less ▲] Detailed reference viewed: 29 (3 ULg)RELIABILITY ACCELERATED TESTING OF MEMS ACCCELEROMETERS; ; et al in IEEE Sensors Journal (2007), 1 An attempt to assess the reliability of a batch of MEMS accelerometers is presented. The testing plan is application oriented and contains combined tests: thermal and mechanical stresses (two variants ... [more ▼] An attempt to assess the reliability of a batch of MEMS accelerometers is presented. The testing plan is application oriented and contains combined tests: thermal and mechanical stresses (two variants: vibration and tilting) were used. The results demonstrated the good reliability of the tested device, the failure rate being smaller than 6.10-8h-1. [less ▲] Detailed reference viewed: 18 (1 ULg)Comparison between finite element calculations and holographic interferometry measurements, of the thermo-mechanical behaviour of satellite structures in composite materialsThizy, Cédric ; Lemaire, Philippe ; Georges, Marc et alin Zhang, G.; Kip, D.; Nolte, D. (Eds.) et al Photorefractive Effects, Materials, and Devices (2005, July) The stability requirements for the satellite structures evolve increasingly. To predict this one during the design phase a more and more used tool is the finite element calculation of thermo-elastic ... [more ▼] The stability requirements for the satellite structures evolve increasingly. To predict this one during the design phase a more and more used tool is the finite element calculation of thermo-elastic models. The verification by measurement of these predictions on operational systems or testing rods is a key element allowing to validate these calculations and also to improve the simulations in order to study more complex cases in a reliable manner. We present the results of such a comparative study carried out on prototype structures using dynamic holographic interferometry, based on a sillenite photorefractive crystal, to measure the thermo-mechanical behavior [less ▲] Detailed reference viewed: 24 (7 ULg)Solar ConcentratorHabraken, Serge ; Defise, Jean-Marc ; Collette, Jean-Paul Patent (2005) A concentrator based on a combination of Fresnel lens and mirror to incresa the efficiency and uniformity Detailed reference viewed: 19 (2 ULg)Solar ConcentrationCollette, Jean-Paul ; Defise, Jean-Marc ; Habraken, Serge Patent (2004) We propose a solar concentrator based on a combination of Fresnel lens and reflectors. This architecture allows for a better light distribution and a thinner lighweight concentrator. Detailed reference viewed: 19 (3 ULg)Solar ConcentratorCollette, Jean-Paul ; Defise, Jean-Marc ; Habraken, Serge Patent (2004) A solar concentrator based on multi V shape reflectors is proposed to reduce the PV cell area (and cost). The optimisation is for space concentration purpose but extendable to terrestrial system. Detailed reference viewed: 35 (6 ULg)Solar ConcentratorCollette, Jean-Paul ; Defise, Jean-Marc ; Habraken, Serge Patent (2003) A space solar concentrator based on light weight reflectors Detailed reference viewed: 17 (3 ULg) |
||
