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compressively sampling the optical transmission matrix of a multimode fibre

Light(Science & Applications) 2021年第5期10卷 916-930页

作者： Shuhui Li charles Saunders Daniel J.Lum John Murray-Bruce Vivek K Goyal tomášČižmár David B.Phillips School of Physics and Astronomy University of ExeterExeterEX44QLUK Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan430074HubeiChina Department of Electrical and computer Engineering Boston UniversityBostonMA02215USA Department of Physics and Astronomy University of Rochester500 Wilson BlvdRochesterNY14618USA Department of computer Science and Engineering University of South FloridaTampaFL33620USA Leibniz Institute of Photonic technology Albert-Einstein-Straße 907745JenaGermany Institute of Scientific Instruments of cAS Královopolská14761264BrnoCzech Republic

the measurement of the optical transmission matrix(tM)of an opaque material is an advanced form of space-variant aberration *** imaging,tM-based methods are emerging in a range of fields,including optical communications,micro-manipulation,and *** many cases,the tM is very sensitive to perturbations in the configuration of the scattering medium it ***,applications often require an up-to-the-minute characterisation of the fragile tM,typically entailing hundreds to thousands of probe ***,we explore how these measurement requirements can be relaxed using the framework of compressive sensing,in which the incorporation of prior information enables accurate estimation from fewer measurements than the dimensionality of the tM we aim to *** of such priors include knowledge of a memory effect linking the input and output fields,an approximate model of the optical system,or a recent but degraded tM *** demonstrate this concept by reconstructing the full-size tM of a multimode fibre supporting 754 modes at compression ratios down to∼5%with good *** show that in this case,imaging is still possible using tMs reconstructed at compression ratios down to∼1%(eight probe measurements).this compressive tM sampling strategy is quite general and may be applied to a variety of other scattering samples,including diffusers,thin layers of tissue,fibre optics of any refractive profile,and reflections from opaque *** approaches offer a route towards the measurement of high-dimensional tMs either quickly or with access to limited numbers of measurements.

关键词： scattering fibre matrix

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A techno-economic and life cycle assessment for the production of green methanol from cO_(2): catalyst and process bottlenecks

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Journal of Energy chemistry 2022年第5期31卷 255-266页

作者： tomas cordero-Lanzac Adrian Ramirez Alberto Navajas Lieven Gevers Sirio Brunialti Luis MGandía Andrés t.Aguayo S.Mani Sarathy Jorge Gascon Department of chemical Engineering University of the Basque Country(UPV/EHU)PO Box 64448080 BilbaoSpain King Abdullah University of Science and technology KAUST Catalysis Center(KCC)Advanced Catalytic MaterialsThuwal 23955Saudi Arabia Department of Science Public University of Navarre(UPNA)Arrosadía Campus s/n31006 PamplonaSpain Institute for Advanced Materials and Mathematics(InaMat2) Universidad Pública de Navarra(UPNA)Edificio Jerónimo de AyanzCampus de ArrosadiaPamplona-Iruña 31006Spain King Abdullah University of Science and technology Clean Combustion Research Center(CCRC)Thuwal 23955Saudi Arabia

the success of catalytic schemes for the large-scale valorization of cO_(2) does not only depend on the development of active,selective and stable catalytic materials but also on the overall process *** we present a multidisciplinary study(from catalyst to plant and techno-economic/lifecycle analysis)for the production of green methanol from renewable H2 and cO_(2).We combine an in-depth kinetic analysis of one of the most promising recently reported methanol-synthesis catalysts(Inco)with a thorough process simulation and techno-economic *** then perform a life cycle assessment of the simulated process to gauge the real environmental impact of green methanol production from cO_(2).Our results indicate that up to 1.75 ton of cO_(2) can be abated per ton of produced methanol only if renewable energy is used to run the process,while the sensitivity analysis suggest that either rock-bottom H2 prices(1.5$kg1)or severe cO_(2) taxation(300$per ton)are needed for a profitable methanol ***,we herein highlight and analyze some critical bottlenecks of the *** attention has been paid to the contribution of H2 to the overall plant costs,cH4 trace formation,and purity and costs of raw *** addition to providing important information for policy makers and industrialists,directions for catalyst(and therefore process)improvements are outlined.

关键词： cO_(2) Methanol Kinetic modeling Process simulation Life cycle assessment

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