Готові списки джерел за темами / Polarisation sensitivity

Добірка наукової літератури з теми "Polarisation sensitivity"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Polarisation sensitivity"

O'Brien, D. M., I. N. Polonsky, and J. B. Kumer. "Sensitivity of remotely sensed trace gas concentrations to polarisation." Atmospheric Measurement Techniques 8, no. 11 (November 23, 2015): 4917–30. http://dx.doi.org/10.5194/amt-8-4917-2015.

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Abstract. Current and proposed space missions estimate column-averaged concentrations of trace gases (CO2, CH4 and CO) from high resolution spectra of reflected sunlight in absorption bands of the gases. The radiance leaving the top of the atmosphere is partially polarised by both reflection at the surface and scattering within the atmosphere. Generally, the polarisation state is unknown and could degrade the accuracy of the concentration measurements. The sensitivity to polarisation is modelled for the proposed geoCARB instrument, which will include neither polarisers nor polarisation scramblers to select particular polarisation states from the incident radiation. The radiometric and polarimetric calibrations proposed for geoCARB are outlined, and a model is developed for the polarisation properties of the geoCARB spectrographs. This model depends principally upon the efficiencies of the gratings to polarisations parallel and perpendicular to the rulings of the gratings. Next, an ensemble of polarised spectra is simulated for geoCARB observing targets in India, China and Australia from geostationary orbit at longitude 110° E. The spectra are analysed to recover the trace gas concentrations in two modes, the first denied access to the polarimetric calibration and the second with access. The retrieved concentrations using the calibration data are almost identical to those that would be obtained with polarisation scramblers, while the retrievals without calibration data contain outliers that do not meet the accuracies demanded by the mission.

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O'Brien, D. M., I. N. Polonsky, and J. B. Kumer. "Sensitivity of remotely-sensed trace gas concentrations to polarisation." Atmospheric Measurement Techniques Discussions 8, no. 8 (August 24, 2015): 8779–816. http://dx.doi.org/10.5194/amtd-8-8779-2015.

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Анотація:

Abstract. Current and proposed space missions estimate column-averaged concentrations of trace gases (CO2, CH4 and CO) from high resolution spectra of reflected sunlight in absorption bands of the gases. The radiance leaving the top of the atmosphere is partially polarised by both reflection at the surface and scattering within the atmosphere. Generally the polarisation state is unknown, and could degrade the accuracy of the concentration measurements. The sensitivity to polarisation is modelled for the proposed geoCARB instrument, which will include neither polarisers nor polarisation scramblers to select particular polarisation states from the incident radiation. The radiometric and polarimetric calibrations proposed for geoCARB are outlined, and a model is developed for the polarisation properties of the geoCARB spectrographs. This model depends principally upon the efficiencies of the gratings to polarisations parallel and perpendicular to the rulings of the gratings. Next an ensemble of polarised spectra is simulated for geoCARB observing targets in India, China and Australia from geostationary orbit at longitude 110° E. The spectra are analysed to recover the trace gas concentrations in two modes, the first denied access to the polarimetric calibration and the second with access. The retrieved concentrations using the calibration data are almost identical to those that would be obtained with polarisation scramblers, while the retrievals without calibration data contain outliers that do not meet the accuracies demanded by the mission.

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Grobkopf, G., R. Ludwig, R. G. Waarts, and H. G. Weber. "Optical amplifier configurations with low polarisation sensitivity." Electronics Letters 23, no. 25 (1987): 1387. http://dx.doi.org/10.1049/el:19870957.

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Holland, A. D., A. D. T. Short, G. W. Fraser, and M. J. L. Turner. "The X-ray polarisation sensitivity of CCDs." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 355, no. 2-3 (February 1995): 526–31. http://dx.doi.org/10.1016/0168-9002(94)01124-9.

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Nahmad–Rohen, Luis, and Misha Vorobyev. "Angular dependence of polarisation contrast sensitivity in octopus." Vision Research 192 (March 2022): 107973. http://dx.doi.org/10.1016/j.visres.2021.107973.

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Kleinlogel, Sonja, and N. Justin Marshall. "Ultraviolet polarisation sensitivity in the stomatopod crustacean Odontodactylus scyllarus." Journal of Comparative Physiology A 195, no. 12 (November 19, 2009): 1153–62. http://dx.doi.org/10.1007/s00359-009-0491-y.

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Molina-Mendoza, Aday J., Alicia Moya, Riccardo Frisenda, Simon A. Svatek, Patricia Gant, Sergio Gonzalez-Abad, Elisa Antolin, et al. "Highly responsive UV-photodetectors based on single electrospun TiO2 nanofibres." Journal of Materials Chemistry C 4, no. 45 (2016): 10707–14. http://dx.doi.org/10.1039/c6tc02344d.

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Electrospun TiO₂ single-nanofibres are employed as photodetectors with state-of-the-art performance: high sensitivity in the UV (responsivity of 90 A W⁻¹ for 375 nm wavelength), response time of ∼5 s and light polarisation sensitivity.

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Honmou, H., S. Yamazaki, K. Emura, R. Ishikawa, I. Mito, M. Shikada, and K. Minemura. "Stabilisation of heterodyne receiver sensitivity with automatic polarisation control system." Electronics Letters 22, no. 22 (1986): 1181. http://dx.doi.org/10.1049/el:19860809.

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Droste, Ch, B. Czajkowska, Z. Marcinkowska, R. M. Lieder, T. Morek, T. Rza¸ca-Urban, and W. Gast. "Polarisation sensitivity of the CLUSTER detector used in EUROBALL array." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 556, no. 1 (January 2006): 182–86. http://dx.doi.org/10.1016/j.nima.2005.10.006.

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Moodie, D. G., P. J. Cannard, A. J. Dann, D. D. Marcenac, C. W. Ford, J. Reed, R. T. Moore, J. K. Lucek, and A. D. Ellis. "Low polarisation sensitivity electroabsorption modulators for 160 Gbit/s networks." Electronics Letters 33, no. 24 (1997): 2068. http://dx.doi.org/10.1049/el:19971393.

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Більше джерел

Дисертації з теми "Polarisation sensitivity"

Saunders, Martin Graham. "Enhancing the sensitivity of NMR by Dynamic Nuclear Polarisation." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/2962/.

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Dynamic Nuclear Polarisation (DNP) is a method used to increase the signal available for nuclear magnetic resonance (NMR) experiments. DNP is one of many hyperpolarisation methods and one implementation, so called ex-situ DNP, sees the sample polarised with a stable radical doping agent at low temperature and with microwave irradiation in a magnetic field before transfer to a second higher field NMR magnet to acquire a liquid state NMR spectrum. The primary goal of this project has been to gain an understanding of the underlying reasons for unpredictable ex-situ DNP polarisation failures and to develop methods to overcome these limitations. In the course of the work an additional polarisation mechanism arising from hindered methyl rotors was discovered. This thesis describes the preparation of DNP samples and the way in which DNP-NMR experiments are performed have been optimised. The concept of a co-polarisation agent has been introduced and methods employing a Nuclear Overhauser Effect have been implemented. Additionally the identification and characterisation of a quantum tunnelling effect that is a variant of the commonly known Haupt effect. Finally these methods have been combined in a number of situations to give results that would have otherwise been unobtainable.

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Clowes, Robin T. "Sensitivity improvement in triple resonance NMR." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388663.

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Izzawati. "The use of a radar backsetter model to assess the sensitivity of multi-frequency, -polarisation and -angle SAR for detecting the growth stage of oil-palm plantations." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402543.

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Colaux, Henri. "Investigating sensitivity improvement methods for quadrupolar nuclei in solid-state nuclear magnetic resonance." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/9628.

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The study of quadrupolar nuclei using NMR spectroscopy in the solid state significantly increased in popularity from the end of the 20th century, with the introduction of specific methods to acquire spectra free from the effects of the quadrupolar interaction, that results in broadened lineshapes that cannot be completely removed by spinning the sample at the magic angle (MAS), unlike most of the other interactions present in the solid state. The first technique which allows, without any specific hardware, the removal of this broadening has been the Multiple-Quantum MQMAS experiment. The method quickly gained a popularity within the NMR community, with numerous successful applications published. However, the multiple-quantum filtration step in this experiment relies on severely limits sensitivity, restricting application to the most sensitive nuclei. Extending the applicability of MQMAS to less receptive nuclei requires the use of signal improvement techniques. There are multiple examples of such approaches in the literature, but most of these require additional optimisation that may be time-consuming, or simply impossible, on less receptive nuclei. This work introduces a novel signal improvement technique for MQMAS, called FAM-N. Its optimisation is solely based on density matrix simulations using SIMPSON, implying no additional experimental optimisation is required, while improving the signal in MQMAS spectra by equivalent or higher amounts than other common methods. In order to prove the applicability of this method on virtually any system, FAM-N has been investigated by simulation, and tested experimentally using a number of model samples, as well as samples known to be challenging to study by NMR. This work also explores other aspects of NMR spectroscopy on quadrupolar nuclei. Adiabatic inversion of the satellite populations can be performed to improve the central transition signal in static or MAS spectra. A range of methods has been tested and compared, with particular attention given to hyperbolic secant-shaped pulses, for which its performance have been described. Finally, cross-polarisation from a spin I = 1/2 nucleus to a quadrupolar nucleus has been investigated. After reviewing the theory for the static case, simulations have been performed under MAS in order to identify the conditions for efficient magnetisation transfer, with applications in spectral editing or for the combination with MQMAS.

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Smolka, Jochen. "Sampling Visual Space: Topography, colour vision and visually guided predator avoidance in fiddler crabs (Uca vomeris)." Phd thesis, 2009. http://hdl.handle.net/1885/7107.

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Many animals use vision to guide their behaviour and to collect relevant information about their environment. The diversity of visual environments and of visually guided tasks has led to a large variety of specialisations of eyes and visual systems. Our knowledge, however, about how the anatomical and physiological properties of eyes and the behavioural strategies of animals relate to the visual signals that are important to them in their natural environment, is extremely limited. In this thesis, I make use of optical, physiological and behavioural analyses to reconstruct the flow of visual information that the fiddler crab Uca vomeris experiences during its daily life on the mudflat. I present a detailed analysis of the first stage of visual processing, the sampling by the ommatidial array of the crabs' compound eye and demonstrate how regional specialisations of optical and sampling resolution reflect the information content and behavioural relevance of different parts of the visual field. Having developed the first intracellular electrophysiological preparation in fiddler crabs, I then examine the spectral sensitivities of photoreceptors - the basis for colour vision. I show that the crabs possess an unusual trichromatic colour vision system featuring a UV-sensitive and a variety of short-wavelength receptor types based on the coexpression of two short-wavelength sensitive pigments. Finally, the natural visual signals that predatory and non-predatory birds present to fiddler crabs are described. The visual cues the crabs use when deciding whether and when to respond to these potential predators are analysed and compared to those used in dummy predator experiments. The crabs use a decision criterion that combines multiple visual cues - including retinal speed, elevation and visual flicker. Neither of these cues accurately predicts risk, but together they reflect the statistical properties of the natural signals the crabs experience. The complex interactions between the design of the crabs' visual system, the stimuli they experience in their natural context and their behaviour demonstrate that neither of them can be understood without knowledge of the other two.
Research School of Biological Sciences (RSBS, now RSB), and the Australian National University for providing funding through an ANU PhD scholarship; the Australian Department of Education, Employment and Workplace Relations for an International Postgraduate Research Scholarship; the German National Academic Foundation and the Zeiss Foundation for support through a Heinz-Dürr Scholarship; and the Australian Institute of Marine Sciences for providing accommodation and facilities during fieldwork in Queensland.

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Частини книг з теми "Polarisation sensitivity"

Steadman, Paul, and Raymond Fan. "Magnetic Scattering with Polarised Soft X-rays." In Magnetic Materials - Recent Advances and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106831.

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Soft X-ray scattering is a powerful technique for measuring magnetic materials. By highlighting some examples using diffraction, small angle scattering and reflectivity the element sensitivity and strong dependence of the polarisation on both the size and direction of the magnetic moments in both single crystals and thin films will be demonstrated.

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Prieto Curiel, Rafael. "Opinion Dynamics and the Inevitability of a Polarised and Homophilic Society." In Theory of Complexity - Definitions, Models, and Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96989.

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A polarised society is frequently observed among ideological extremes, despite individual and collective efforts to reach a consensual opinion. Human factors, such as the tendency to interact with similar people and the reinforcement of such homophilic interactions or the selective exposure and assimilation to distinct views are some of the mechanisms why opinions might evolve into a more divergent distribution. A complex model in which individuals are exposed to alternating waves of propaganda which fully support different extreme views is considered here within an opinion dynamics model. People exposed to different extreme narratives adopt and share them with their peers based on the persuasiveness of the propaganda and are mixed with their previous opinions based on the volatility of opinions to form a new individual view. Social networks help capture elements such as homophily, whilst persuasiveness and memory capture bias assimilation and the exposure to ideas inside and outside echo chambers. The social levels of homophily and polarisation after iterations of people being exposed to extreme narratives define distinct trajectories of society becoming more or less homophilic and reaching extremism or consensus. There is extreme sensitivity to the parameters so that a small perturbation to the persuasiveness or the memory of a network in which consensus is reached could lead to the polarisation of opinions, but there is also unpredictability of the system since even under the same starting point, a society could follow substantially different trajectories and end with a consensual opinion or with extreme polarising views.

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Тези доповідей конференцій з теми "Polarisation sensitivity"

Fang, Xu, James Frame, Nicolas Green, and Wakana Kubo. "Plasmonic vanadium dioxide microbolometers with wavelength and polarisation sensitivity." In Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI, edited by Takuo Tanaka and Din Ping Tsai. SPIE, 2018. http://dx.doi.org/10.1117/12.2320554.

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Wong, Samuel, and Manik Attygalle. "Simple Technique to Reduce Polarisation Sensitivity in Optical Devices." In 2007 the Joint International Conference on Optical Internet (COIN) and Australian Conference on Optical Fibre Technology (ACOFT). IEEE, 2007. http://dx.doi.org/10.1109/coinacoft.2007.4519142.

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Wong, Samuel, and Manik Attygalle. "Simple Technique to Reduce Polarisation Sensitivity in Optical Devices." In 2006 Australian Conference on Optical Fibre technology (ACOFT). IEEE, 2007. http://dx.doi.org/10.1109/acoft.2007.4516235.

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Shaheen, Sabahat, та Konstantin Hicke. "Measurement of Geometric Phase using a ϕ-OTDR setup". У Optical Fiber Sensors. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/ofs.2022.w4.72.

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Geometric phase showing sensitivity to changes in polarisation state and intensity of backscattered light is measured using a novel ϕ-OTDR setup based on coherent heterodyne detection. Principle is demonstrated using a polarisation scrambler inline a fiber-under-test.

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Carey, Nicole, and Wolfgang Sturzl. "An insect-inspired omnidirectional vision system including UV-sensitivity and polarisation." In 2011 IEEE International Conference on Computer Vision Workshops (ICCV Workshops). IEEE, 2011. http://dx.doi.org/10.1109/iccvw.2011.6130258.

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Moodie, D. G. "Low polarisation sensitivity buried heterostructure electroabsorption modulators for ultra high speed networks." In 11th International Conference on Integrated Optics and Optical Fibre Communications. 23rd European Conference on Optical Communications IOOC-ECOC97. IEE, 1997. http://dx.doi.org/10.1049/cp:19971394.

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Emery, J. Y., M. Picq, F. Poingt, F. Gaborit, R. Brenot, M. Renaud, B. Lavigne, and A. Dupas. "Optimised 2-R All-optical Regenerator With Low Polarisation Sensitivity Penalty (<1dB) For Optical Networking Applications." In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2001. http://dx.doi.org/10.1364/ofc.2001.mb4.

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Barreiro Alonso, Fernando, Ahmed Ali, and Javier Llorente Merino. "Improved sensitivity to charged Higgs searches in top quark decays at the LHC using tau polarisation and multivariate tecnniques." In Prospects for Charged Higgs Discovery at Colliders. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.156.0026.

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Llorente Merino, Javier, Fernando Barreiro Alonso, and Ahmed Ali. "Improved sensitivity to charged Higgs searches un top quark decays $t \to bH^+ \to b(\tau^+\nu_\tau)$ at the LHC using $\tau$ polarisation and multivariate techniques." In 36th International Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.174.0085.

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