Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 2008
The present paper describes the different steps leading to the Flight Model integration of the Mi... more The present paper describes the different steps leading to the Flight Model integration of the Mid-Infra Red IMager Optical Bench MIRIM-OB which is part of the scientific payload of the JWST. In order to demonstrate a space instrument capability to survive the challenging space environment and deliver the expected scientific data, a specific development approach is applied in order to
Optical Fabrication, Testing, and Metrology II, 2005
The next generation of infrared - sub mm space telescopes requires reflectors with large dimensio... more The next generation of infrared - sub mm space telescopes requires reflectors with large dimensions, high quality and, according to weight issues, are based on composite or new materials technology. The challenging tasks of on-ground testing are to achieve the required accuracy in the measurement of these reflectors shape and antenna structures and to verify their performance under simulated space conditions (vacuum, low-high temperatures). A holographic camera for the verification and validation of this type of reflector in a space environment is presented. A diffuser is implemented to measure the deformations of reflective surfaces in a more flexible way. The system has been made compatible with the vacuum conditions. Some elements of the holographic camera (camera lenses, CCD, crystal, optical fibre) have been adapted and tested under vacuum. The metrological certification of the whole system is realised by the measurement of a parabolic CFRP reflector with a 1.1 meter diameter. The results are compared to the one achieved with a high spatial resolution IR interferometer on the same reflector in laboratory conditions and under thermal vacuum conditions. This later test consists in measuring the deformations of the reflector between an initial state at a selected temperature and a final state at another temperature. The comparison between the high spatial resolution IR interferometer and this dynamic holographic method showed very good qualitative and quantitative agreement between the techniques, thus verifying the potential of this new Holographic approach.
The next generation of infrared - sub mm space telescopes requires some reflectors with large dim... more The next generation of infrared - sub mm space telescopes requires some reflectors with large dimensions and high quality. These ones, according to weight issues, are based on composite materials for which the behaviors at low temperatures are badly known. A holographic interferometry method for the verification and validation of this type of reflectors in a space environment is presented.
Abstract:[en] Large reflectors and antennas for the IR to mm wavelength range are being planned f... more Abstract:[en] Large reflectors and antennas for the IR to mm wavelength range are being planned for many Earth observation and astronomical space missions and for commercial communication satellites as well. The challenging tasks of on-ground testing are to ...
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 2008
The present paper describes the different steps leading to the Flight Model integration of the Mi... more The present paper describes the different steps leading to the Flight Model integration of the Mid-Infra Red IMager Optical Bench MIRIM-OB which is part of the scientific payload of the JWST. In order to demonstrate a space instrument capability to survive the challenging space environment and deliver the expected scientific data, a specific development approach is applied in order to
ABSTRACT A new solar panel with high concentration photovoltaic technology (x700) has been design... more ABSTRACT A new solar panel with high concentration photovoltaic technology (x700) has been designed, prototyped and tested in the SOLMACS project. The quality of concentrating optics is a key factor for high module efficiency. Therefore new dedicated PMMA Fresnel lenses were studied and produced by injection molding. Lens design, material and production process were optimized to achieve a high optical yield of 86%. Thorough lens performance assessment in optical laboratory was completed with lifetime UV aging tests. Another important aspect is the thermal control of the hot spot created under the solar cell that receives the concentrated flux of 700 Suns. A dedicated heat spreader was developed to achieve passive thermal control with minimum mass and cost. This was supported by thermal models and tests at both cell and module level. 35% triple junction cells were implemented in the module. Micro-assembly technologies were used for the cell packaging and electrical connections. In support to the research, a continuous solar simulator was designed and built to assess the system performance, both at component and module level. The concentrator developments were integrated in a prototype and tested both indoor with the simulator and outdoor on the CSL solar test platform. The overall efficiency of the PV concentrator module is 28.5%.
P Rochus, JM Defise, JH Lecat, Y Stockman, P Franco, JM Gillis, E Mazy, JP Halain, L Rossi, T Thi... more P Rochus, JM Defise, JH Lecat, Y Stockman, P Franco, JM Gillis, E Mazy, JP Halain, L Rossi, T Thibert, D Berghmans, JF Hochedez, A Ben Moussa, B Nicula, R Van Der Linden, A Zhukov, L Wauters, F Clette, M Nesladek 55 th International Astronautical Congress 2004, 1-7 ...
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 2008
The present paper describes the different steps leading to the Flight Model integration of the Mi... more The present paper describes the different steps leading to the Flight Model integration of the Mid-Infra Red IMager Optical Bench MIRIM-OB which is part of the scientific payload of the JWST. In order to demonstrate a space instrument capability to survive the challenging space environment and deliver the expected scientific data, a specific development approach is applied in order to
Optical Fabrication, Testing, and Metrology II, 2005
The next generation of infrared - sub mm space telescopes requires reflectors with large dimensio... more The next generation of infrared - sub mm space telescopes requires reflectors with large dimensions, high quality and, according to weight issues, are based on composite or new materials technology. The challenging tasks of on-ground testing are to achieve the required accuracy in the measurement of these reflectors shape and antenna structures and to verify their performance under simulated space conditions (vacuum, low-high temperatures). A holographic camera for the verification and validation of this type of reflector in a space environment is presented. A diffuser is implemented to measure the deformations of reflective surfaces in a more flexible way. The system has been made compatible with the vacuum conditions. Some elements of the holographic camera (camera lenses, CCD, crystal, optical fibre) have been adapted and tested under vacuum. The metrological certification of the whole system is realised by the measurement of a parabolic CFRP reflector with a 1.1 meter diameter. The results are compared to the one achieved with a high spatial resolution IR interferometer on the same reflector in laboratory conditions and under thermal vacuum conditions. This later test consists in measuring the deformations of the reflector between an initial state at a selected temperature and a final state at another temperature. The comparison between the high spatial resolution IR interferometer and this dynamic holographic method showed very good qualitative and quantitative agreement between the techniques, thus verifying the potential of this new Holographic approach.
The next generation of infrared - sub mm space telescopes requires some reflectors with large dim... more The next generation of infrared - sub mm space telescopes requires some reflectors with large dimensions and high quality. These ones, according to weight issues, are based on composite materials for which the behaviors at low temperatures are badly known. A holographic interferometry method for the verification and validation of this type of reflectors in a space environment is presented.
Abstract:[en] Large reflectors and antennas for the IR to mm wavelength range are being planned f... more Abstract:[en] Large reflectors and antennas for the IR to mm wavelength range are being planned for many Earth observation and astronomical space missions and for commercial communication satellites as well. The challenging tasks of on-ground testing are to ...
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 2008
The present paper describes the different steps leading to the Flight Model integration of the Mi... more The present paper describes the different steps leading to the Flight Model integration of the Mid-Infra Red IMager Optical Bench MIRIM-OB which is part of the scientific payload of the JWST. In order to demonstrate a space instrument capability to survive the challenging space environment and deliver the expected scientific data, a specific development approach is applied in order to
ABSTRACT A new solar panel with high concentration photovoltaic technology (x700) has been design... more ABSTRACT A new solar panel with high concentration photovoltaic technology (x700) has been designed, prototyped and tested in the SOLMACS project. The quality of concentrating optics is a key factor for high module efficiency. Therefore new dedicated PMMA Fresnel lenses were studied and produced by injection molding. Lens design, material and production process were optimized to achieve a high optical yield of 86%. Thorough lens performance assessment in optical laboratory was completed with lifetime UV aging tests. Another important aspect is the thermal control of the hot spot created under the solar cell that receives the concentrated flux of 700 Suns. A dedicated heat spreader was developed to achieve passive thermal control with minimum mass and cost. This was supported by thermal models and tests at both cell and module level. 35% triple junction cells were implemented in the module. Micro-assembly technologies were used for the cell packaging and electrical connections. In support to the research, a continuous solar simulator was designed and built to assess the system performance, both at component and module level. The concentrator developments were integrated in a prototype and tested both indoor with the simulator and outdoor on the CSL solar test platform. The overall efficiency of the PV concentrator module is 28.5%.
P Rochus, JM Defise, JH Lecat, Y Stockman, P Franco, JM Gillis, E Mazy, JP Halain, L Rossi, T Thi... more P Rochus, JM Defise, JH Lecat, Y Stockman, P Franco, JM Gillis, E Mazy, JP Halain, L Rossi, T Thibert, D Berghmans, JF Hochedez, A Ben Moussa, B Nicula, R Van Der Linden, A Zhukov, L Wauters, F Clette, M Nesladek 55 th International Astronautical Congress 2004, 1-7 ...
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Papers by E. Mazy