International Conference on Space Optics — ICSO 2018, Jul 12, 2019
In this paper, we describe the NanoCarb concept as well as its key elements. Then we will explain... more In this paper, we describe the NanoCarb concept as well as its key elements. Then we will explain the design of the prototype followed by the development of characterization techniques. Finally, we will present how this tool can be used as part of end-to-end model. The key element of the NanoCarb concept is a matrix of silicon Fabry-Perot microinterferometers, which allows us to perform both imaging and interferometry with a field of view of 18° and several interferometric samples in a snapshot. This technique permits us to optimize the SNR for a much reduced volume. The very complex and unusual design of this component brings huge optical and technological challenges, and requires the development of characterization techniques at the nanometer scale. Upon achievement of this purpose, the next step will be the integration of this matrix in a NanoCarb prototype to demonstrate its effective performances. We present a test bench using the interferential metrology technique of Optical Coherence Tomography (OCT). In a first time, we managed to obtain optical path maps of different silicon wafers with nanometer accuracy. Then, we employed the technique to characterize the first micro-interferometers. In parallel, we realized the first prototype integration of NanoCarb with an InGaAs focal plane array and started its characterization
NanoCarb is an innovative Fourier-transform imaging spectrometer dedicated to the measurement of ... more NanoCarb is an innovative Fourier-transform imaging spectrometer dedicated to the measurement of CO 2 and CH 4 . Both its unusual optical principle and sampling strategy allow to reach a compact design, ideal for small satellite constellation as investigated by the European project SCARBO. The NanoCarb performance assessment as well as a proof of concept is required in this framework. We have developed a design strategy to optimize the performances. We demonstrate the potential of the concept through an estimation of the sensitivity, compliant with the space mission target. We also present a preliminary mitigation of the bias induced by water on CO 2 and CH 4 retrieval, illustrating the efficiency and the flexibility of the NanoCarb partial interferogram sampling technique. The presented design reaches a sub-ppm random error for CO 2 and sub-10 ppb random error for CH 4 , considering 128 km swath and 2 by 2 km 2 ground resolution. Design optimization and more systematic performances are discussed.
International Conference on Space Optics — ICSO 2018, Jul 12, 2019
Nanocarb is a snapshot imaging interferometer concept dedicated to the measurement of CO2. Thanks... more Nanocarb is a snapshot imaging interferometer concept dedicated to the measurement of CO2. Thanks to its very compact design, it is a good candidate for small satellites, which would pave the way to a constellation of satellites to monitor emission of anthropogenic greenhouse gases from space. Nanocarb is based on a multiaperture design, with a stepcase interferometric plate to measure partial interferograms. It is developed in the framework of the Scarbo project, an European project involving several partners, the aim of which being to design and analyse the performances of the Nanocarb concept, complemented by collocated compact aerosol sensor and CO2 reference instruments. The overall measurement concept will be experimentally validated through a dedicated airborne campaign featuring instrument prototypes.
NanoCarb is an innovative Fourier Transform imaging spectrometer dedicated to the measurement of ... more NanoCarb is an innovative Fourier Transform imaging spectrometer dedicated to the measurement of CO 2 and CH 4 . Both its unusual optical principle and sampling strategy allows to reach a compact design, ideal for small satellite constellation as investigated by the European project SCARBO. The NanoCarb performance assessment as well as a proof of concept are required in this framework. A strategy of design is developed to optimize the performances and reach the sensitivity target of the space mission, demonstrating the potential of the concept without drastic complexity gain. A preliminary bias mitigation in the retrieval strategy is presented concerning water for CO 2 measurement, illustrating the efficiency and the flexibility of the NanoCarb partial interferogram sampling technic. The presented design reaches a random error sub-ppm for CO 2 and sub-10ppb for CH 4 , considering a 128 to 192 km swath, respectively, for 2 or 3 km of resolution at ground. A full mitigation of the water bias is performed on CO 2 band thanks to partial interferograms.
International Conference on Space Optics — ICSO 2018
In this paper, we describe the NanoCarb concept as well as its key elements. Then we will explain... more In this paper, we describe the NanoCarb concept as well as its key elements. Then we will explain the design of the prototype followed by the development of characterization techniques. Finally, we will present how this tool can be used as part of end-to-end model. The key element of the NanoCarb concept is a matrix of silicon Fabry-Perot microinterferometers, which allows us to perform both imaging and interferometry with a field of view of 18° and several interferometric samples in a snapshot. This technique permits us to optimize the SNR for a much reduced volume. The very complex and unusual design of this component brings huge optical and technological challenges, and requires the development of characterization techniques at the nanometer scale. Upon achievement of this purpose, the next step will be the integration of this matrix in a NanoCarb prototype to demonstrate its effective performances. We present a test bench using the interferential metrology technique of Optical Coherence Tomography (OCT). In a first time, we managed to obtain optical path maps of different silicon wafers with nanometer accuracy. Then, we employed the technique to characterize the first micro-interferometers. In parallel, we realized the first prototype integration of NanoCarb with an InGaAs focal plane array and started its characterization
International Conference on Space Optics — ICSO 2018
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
International Conference on Space Optics — ICSO 2018
Nanocarb is a snapshot imaging interferometer concept dedicated to the measurement of CO2. Thanks... more Nanocarb is a snapshot imaging interferometer concept dedicated to the measurement of CO2. Thanks to its very compact design, it is a good candidate for small satellites, which would pave the way to a constellation of satellites to monitor emission of anthropogenic greenhouse gases from space. Nanocarb is based on a multiaperture design, with a stepcase interferometric plate to measure partial interferograms. It is developed in the framework of the Scarbo project, an European project involving several partners, the aim of which being to design and analyse the performances of the Nanocarb concept, complemented by collocated compact aerosol sensor and CO2 reference instruments. The overall measurement concept will be experimentally validated through a dedicated airborne campaign featuring instrument prototypes.
NanoCarb is an innovative Fourier Transform imaging spectrometer dedicated to the measurement of ... more NanoCarb is an innovative Fourier Transform imaging spectrometer dedicated to the measurement of CO 2 and CH 4 . Both its unusual optical principle and sampling strategy allows to reach a compact design, ideal for small satellite constellation as investigated by the European project SCARBO. The NanoCarb performance assessment as well as a proof of concept are required in this framework. A strategy of design is developed to optimize the performances and reach the sensitivity target of the space mission, demonstrating the potential of the concept without drastic complexity gain. A preliminary bias mitigation in the retrieval strategy is presented concerning water for CO 2 measurement, illustrating the efficiency and the flexibility of the NanoCarb partial interferogram sampling technic. The presented design reaches a random error sub-ppm for CO 2 and sub-10ppb for CH 4 , considering a 128 to 192 km swath, respectively, for 2 or 3 km of resolution at ground. A full mitigation of the water bias is performed on CO 2 band thanks to partial interferograms.
NanoCarb is an innovative Fourier-transform imaging spectrometer dedicated to the measurement of ... more NanoCarb is an innovative Fourier-transform imaging spectrometer dedicated to the measurement of CO2and CH4. Both its unusual optical principle and sampling strategy allow to reach a compact design, ideal for small satellite constellation as investigated by the European project SCARBO. The NanoCarb performance assessment as well as a proof of concept is required in this framework. We have developed a design strategy to optimize the performances. We demonstrate the potential of the concept through an estimation of the sensitivity, compliant with the space mission target. We also present a preliminary mitigation of the bias induced by water on CO2and CH4retrieval, illustrating the efficiency and the flexibility of the NanoCarb partial interferogram sampling technique. The presented design reaches a sub-ppm random error for CO2and sub-10 ppb random error for CH4, considering 128 km swath and 2 by 2 km2ground resolution. Design optimization and more systematic performances are discussed.
The Monitoring Nitrous Oxide Sources (MIN 2 OS) satellite project aims at monitoring global-scale... more The Monitoring Nitrous Oxide Sources (MIN 2 OS) satellite project aims at monitoring global-scale nitrous oxide (N 2 O) sources by retrieving N 2 O surface fluxes from the inversion of space-borne N 2 O measurements that are
Uploads
Papers by Laure Brooker