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Literatura académica sobre el tema "Mirror system"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Mirror system"

Huang, Dengpeng, Lei Zhang, Shijun Ji y Ji Zhao. "Tool path generation for ultra-precision polishing of freeform optical surfaces in an off-axis three-mirror imaging system". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, n.º 5 (16 de diciembre de 2015): 814–24. http://dx.doi.org/10.1177/0954405415599916.

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The optical performance of the off-axis three-mirror imaging system can be greatly improved using freeform surfaces. This article focuses on the polishing of the primary mirror and tertiary mirror in an off-axis three-mirror imaging system. The primary mirror and tertiary mirror are fabricated on one monolithic substrate and described by non-uniform rational B-spline–based freeform surfaces. The separated and integrated polishing strategies are presented for polishing the two mirrors on the four-axis computer numerical control polishing platform. A tool path generation approach is proposed for polishing of the non-uniform rational B-spline–based freeform surface. Three kinds of the tool paths are given for ultra-precision polishing of the primary mirror and tertiary mirror with the freeform surfaces. The concentric circle path and the approximately concentric circle path are generated for polishing two mirrors separately, while the spiral path is calculated for integrated polishing of two mirrors simultaneously. The polishing tool posture along the planned tool paths is also analyzed. The ultra-precision polishing experiments of the primary mirror and tertiary mirror on the four-axis computer numerical control polishing platform are performed to verify the proposed approach for tool path generation.

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Mehta, Bharati y Bharti Bhandari. "The Mirror Neuron System: Basic Concepts". International Physiology 4, n.º 2 (2016): 77–80. http://dx.doi.org/10.21088/ip.2347.1506.4216.7.

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Yershov, V. N. y A. A. Nemiro. "An Autocollimation Circle Reading System for the Infrared Meridian Instrument". Symposium - International Astronomical Union 166 (1995): 361. http://dx.doi.org/10.1017/s0074180900228441.

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A new autocollimation circle reading system is proposed for the reflector meridian circle (Nemiro and Streletsky, 1988). The instrument will be used for observations in the K-infrared waveband. Instead of the divided circle fixed to the instrument tube the new system has small spherical mirrors polished at the lateral surfaces of the primary mirror. The primary mirror is made from sitall and has an autocollimation system aimed at monitoring its optical axis position. The small spherical mirrors of the circle reading system link the circle readings with the primary's optical axis. The divided circles are fixed unmovable opposite to both lateral surfaces of the primary's optical block. Both surfaces have four spherical mirrors. The distance between the divided circles and the mirrors is equal to the mirrors' radii of curvature. The scales of each circle are illuminated from outside (where the measuring microscopes are placed). The mirrors form autocollimated images of the divisions at the plane of the divisions itself. Averaged coordinates of a division and its autocollimated image give the position of the mirror's optical center, and the semi-difference of the coordinates gives the angular position of the telescope. So, the measurements of the circle positions are differential ones, and any displacements of the microscope zero-points are not critical. The precision of measurements is estimated to be better then 0.05″ (random) and 0.005″ (systematical). The work was supported by the Russian Foundation of Fundamental Investigations (the project's code is 93-02-17095).

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Ma, Zhi Yong. "Research on Concept System of Rotation-Mirror Symmetry in Mechanical Systems". Applied Mechanics and Materials 201-202 (octubre de 2012): 7–10. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.7.

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Mechanical rotation-mirror symmetry is grouped by rotation symmetry and mirror symmetry, and belongs to mechanical static structure symmetry. Collecting and Analyzing a lot of rotation-mirror symmetric instances, and referring to the researches on concept systems of rotation symmetry and mirror symmetry, the concept system of rotation-mirror symmetry was established. The concept system is classified by discrete mirror and continuous mirror rotation-mirror symmetry, unidirectional rotation and bidirectional rotation rotation-mirror symmetry, directed rotation and deflecting rotation rotation-mirror symmetry, entire rotation and partial rotation rotation-mirror symmetry. The concept system can completely contain all kinds of existence of rotation-mirror symmetry in mechanical systems.

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Gong, Yan Jue, Zhao Fu, Hui Yu Xiang, Li Zhang y Chun Ling Meng. "Dynamic Optimum of the MEMS Micro-Deformable Mirror for Food Safety Detection". Advanced Materials Research 121-122 (junio de 2010): 69–73. http://dx.doi.org/10.4028/www.scientific.net/amr.121-122.69.

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As the important elements in adaptive optical system used for food safety detection instrument, Micro-deformable mirrors are typical Microelectromechanical systems (MEMS). This paper focuses on the structural optimization of the MEMS Micro-deformable mirror. With the method of finite method analysis, the dynamic characteristics of the micro-mirror are studied by the analysis of modal and frequency respond. The random vibration analysis followed shows the optimized structure parameters of the micro-mirror are effective to improve the dynamic performance of the mirror.

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Gai, Ke Rong, Xiao Tie Niu y Tao Fang. "Study of Space Big Aperture New Materials Mirror and its Technology". Advanced Materials Research 217-218 (marzo de 2011): 1475–82. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.1475.

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In order to keep step with new materials mirrors and its technology of developed of international space optics system, and promote research level of national new material mirror, the optimization methods of new mirror materials were introduced, and the application of new material mirrors was elaborated. The researching technologies and methods of new materials mirror substrate were recommended. The researching technologies and methods of new materials mirror were narrated. And at same time, the new materials mirror technology and directions of our country were pointed out.

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Rajmohan, V. y E. Mohandas. "Mirror neuron system". Indian Journal of Psychiatry 49, n.º 1 (2007): 66. http://dx.doi.org/10.4103/0019-5545.31522.

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Zvonkov, A. V., A. Yu Kuyanov, J. Nuehrenberg, A. A. Skovoroda y R. Zille. "Toroidal mirror system". Plasma Physics Reports 28, n.º 9 (septiembre de 2002): 756–64. http://dx.doi.org/10.1134/1.1508026.

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Yamamoto, Tetsu, Takaharu Ueda, Shigeki Mizuno y Toshiro Ono. "Mirror Chopping System." Transactions of the Japan Society of Mechanical Engineers Series C 61, n.º 589 (1995): 3497–503. http://dx.doi.org/10.1299/kikaic.61.3497.

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Verman, Boris, Srivatsan Seshadri y Bonglea Kim. "A Simple Analytical Approach to Describe a Beam Conditioning System". Materials Science Forum 443-444 (enero de 2004): 171–74. http://dx.doi.org/10.4028/www.scientific.net/msf.443-444.171.

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A simple analytical approach is given to calculate the performance of parabolic mirrors for various wavelengths. Expressions are given for the efficiency of the parabolic mirror system and insertion gain. As examples, parameters for some mirrors for CuKα and MoKα radiation are calculated.

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Tesis sobre el tema "Mirror system"

Moonens, Sofie. "Mirror Neurons : The human mirror neuron system". Thesis, Högskolan i Skövde, Institutionen för kommunikation och information, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-6103.

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This literature review explores human mirror neurons from several angles. First it retells mirror neuron history, from the initial discovery in the macaque monkey research through to the experiments determining if there is a human brain homologue. Then the merits of two opposing evolutionary views – mirror neurons as an adaptation or an association, here referring to an adaptation’s byproduct – are discussed. Lastly the autistic mirror neuron dysfunction hypothesis – stating that a faulty mirror neuron system is at the basis of autistic behavioral patterns – is examined for its validity but ultimately found lacking and in need of further development.

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Westlund, Kristina. "The Mirror Neuron System and Its Role in Autism Spectrum Disorder". Thesis, University of Skövde, School of Humanities and Informatics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-3128.

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The discovery of mirror neurons and the mirror neuron system is one of the most interesting breakthroughs in the field of neuroscience in recent years. The topic stretches over a wide spectrum of research fields but one of the more prominent areas is concerned with the role of mirror neurons in autism spectrum disorder. It is hypothesized that an impaired mirror neuron system may be one of the main causes underlying the deficits seen in autistic individuals. Parallel to the broken mirror theory of autism there are critical voices claiming there is not enough empirical evidence to support such a theory. Research carried out in the area seems to offer support for both contradictory approaches making it hard to conclude the definite role of mirror neurons in this developmental disorder. Future research may offer conclusive answers concerning the role of the mirror neuron system in autism spectrum disorder as well as other important questions regarding the functional properties of the brain areas under question.

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Catmur, C. "Effects of sensorimotor learning on the human mirror neuron system". Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1445997/.

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The discovery, in the monkey, of "mirror" neurons, which fire in response both to the performance and to the observation of specific actions, has prompted extensive research into their properties, and into the possible functions of a putative mirror neuron system in humans. Little is known, however, about how such neurons acquire their matching properties. This thesis addresses this question using a variety of techniques. Imitation is one of the key processes thought to be subserved by the mirror neuron system Chapter 3 shows that automatic imitation effects are separable from spatial compatibility effects. This establishes automatic imitation effects as suitable targets for experimental manipulations of mirror neuron system function. Strengthening this conclusion, Chapter 4 indicates that automatic imitation effects can be delayed by repetitive theta burst transcranial magnetic stimulation (TMS) of the inferior frontal gyrus, an area homologous with the premotor F5 mirror neuron area in the macaque. In Chapter 5, single-pulse TMS is used to produce motor evoked potentials (MEPs). In an action observation experiment, an automatic muscle-specific "mirror" effect is shown: the size of the MEP in a given muscle is sensitive to the identity of the muscle that would be used to perform the observed movement. It is then demonstrated that this effect can be reversed following a period of incompatible sensorimotor training. This result is built upon in Chapter 6: it is shown behaviourally that incompatible sensorimotor training can reduce automatic imitation effects, and, using functional magnetic resonance imaging, that it can reverse neural responses to observed actions in the human mirror neuron system. It is concluded that sensorimotor learning can reconfigure the human mirror neuron system, and that it is, therefore, a mechanism through which the mirror neuron system can acquire its ability to match observed with performed actions.

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Macgregor, Andrew Alan. "The laser mirror alignment system for the LHCb RICH detectors". Thesis, University of Glasgow, 2006. http://theses.gla.ac.uk/1732/.

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The Large Hadron Collider beauty (LHCb) experiment at the Large Hadron Collider (CERN), is the next generation B physics experiment designed to precisely constrain the Cabibbo-Kobayashi-Maskawa (CKM) matrix measurements with unprecedented accuracy, as well as search for new physics. The success of the LHCb experiment relies upon excellent particle identification. The central particle identification detectors for the LHCb experiment are the Ring Imaging Cherenkov (RICH) detectors which are reliant upon their optics being well aligned. The optical specifications for the second RICH detector (RICH2) are for the mirrors to be aligned to within 0.1 mrad so as not to degrade the inherent 0.7 mrad resolution of the detector. As the mirrors move out of alignment over time, the performance of the RICH will deteriorate, unless corrected. This thesis describes the design and characterisation of the Laser Mirror Alignment Monitoring System and its image analysis software for selected mirrors of RICH2. This thesis also describes the results of a unique method of combining data from the Laser Mirror Alignment Monitoring System and Tracking system, to recover the positions of all mirror segments in the RICH2 detector. The laser alignment monitoring system resolution has been measured to be 0.013 mrad for both θy and θx rotations, with a long term stability of 0.014 mrad in θy and 0.006 mrad in θx. The resolution of the final mirror alignment procedure using data tracks is 0.18 mrad for θy mirror rotations and 0.12 mrad for θx mirror rotations.

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Woodruff, Rick Bryan. "A two axis mirror positioning system with quadrature encoder output". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40932.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.
Includes bibliographical references.
This project was conducted in support of a solar concentrating technology that required the design and construction of a low cost, two axis rotational drive system with a resolution of one degree or better. The scope of this project was to design and build a two axis drive system capable of supporting a 20" square acrylic mirror. Cost, reliability, and the ability to be built by students using student resources were of primary concern. The primary design concern was the development of a low cost feedback system. Several different feedback sensors were considered, and a quadrature encoder was chosen. To reduce cost, the encoder disk was made from an overhead transparency with a slotted image printed on it. The required encoder accuracy was 1.0 degree, and a measured accuracy of 0.85 degrees was achieved. The encoder was designed with an optimum accuracy of 0.55 degrees per transition and the observed discrepancy in resolution is primarily due to high tolerances that could not be met with hand assembly.
by Rick Bryan Woodruff.
S.B.

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Behmer, Lawrence P. Jantzen Kelly J. "Reading sheet music activates the mirror neuron system of musicians : an EEG investigation /". Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=342&CISOBOX=1&REC=16.

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Cagatay, Kartal. "Modeling, Identification And Real Time Position Control Of A Two-axis Gimballed Mirror System". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611668/index.pdf.

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This work focuses on modeling, parameter estimation, and real-time position control of a two axis Gimbaled Mirror System (GMS) which is designed and manufactured to move an IR spot generated by an Infra Red Scene Generator System (IRSGS) in two orthogonal axes (elevation and azimuth) within the IR scene which is also generated by the IRSGS. Mathematical models of the GMS, the control system, and the disturbance torque originated from the movements of Flight Motion Simulator (FMS), on which the IRSGS will be mounted, are constructed using MATLAB®
/Simulink®
and MATLAB/Simulink/SimMechanics®
. Parameter estimations of the GMS and control system elements are achieved using MATLAB/Simulink Parameter Estimation Tool®
. The controller tuning is performed using the developed mathematical models in MATLAB/Simulink environment. Optimized digital PID controllers are implemented in the real-time control system. Performances of the controllers for both GMS axes are evaluated by both real system tests and simulation runs
and the results of these runs are compared. Controller performances under the effect of disturbances are analyzed by using the mathematical models developed in the MATLAB/ Simulink environment.

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Marais, Ade. "Neurocorrelates of the Mirror Neuron System in Children with Chromosome 22q11.2 Deletion Syndrome". ScholarWorks@UNO, 2017. https://scholarworks.uno.edu/td/2422.

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Activation of brain regions that make up the mirror neuron system (MNS) is thought to reflect processing and perceiving behavior, action, and intentionality of other organisms. Sensing and perceiving motor behavior in others is an important component of understanding and participating in social interactions. Children with chromosome 22q11.2 deletion syndrome (22q11.2DS) are diagnosed with serious medical, cognitive, and socio-emotional symptoms. Atypical development and function of the MNS may underpin some aspects of socio-emotional impairment and autism spectrum disorder (ASD)-like symptomology reported. This study of the MNS investigates differences in activation in the operculum, sensorimotor areas, and basal ganglia (BG) in children with 22q11.2DS compared to typically-developing (TD) controls. Twenty-nine children (22q11.2DS: n=15; TD: n=16) between ages 7-16 viewed videos of a human hand manipulating various household objects during a functional magnetic resonance imaging (fMRI) scan. In Analysis 1, children with 22q11.2DS had less extensive brain activation than TD children in the operculum, sensorimotor areas, and BG. In Analysis 2, children with 22q11.2DS had the same results as Analysis 1 with the exception of sensorimotor areas not being highly active in either group. In both analyses, fMRI signal change from baseline to video did not differ significantly between groups. Processing efficiency in children with 22q11.2DS may be lower or more variable when compared to TD peers. This is the first study comparing children with 22q11.2DS to TD peers specifically looking at MNS activation within the operculum region to assess higher cognitive functioning, somatosensory cortex for sensory interpretation, and basal ganglia for gross motor activity. Future studies should compare brain activation between children with ASD and those with 22q11.2DS during an MNS task as the next step to further clarify the origin of ASD symptoms reported in this population.

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Argueta-Diaz, Victor. "Proof of feasibility of a free-space optical cross-connect system using digital mems". The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1109795698.

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Puzzo, Ignazio. "Individual differences in the human mirror neuron system : electroencephalographic and transcranial magnetic stimulation investigations". Thesis, University of Essex, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528858.

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Libros sobre el tema "Mirror system"

Lee, James K. The tongue: Mirror of the immune system. Tunbridge, U.K: Helios Books, 1999.

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Arbib, Michael A., ed. Action to Language via the Mirror Neuron System. Cambridge: Cambridge University Press, 2006. http://dx.doi.org/10.1017/cbo9780511541599.

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How the brain got language: The mirror system hypothesis. Oxford: Oxford University Press, 2012.

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Marshall, Robert. Living anatomy: Structure as the mirror of function. Victoria: Melbourne University Press, 2001.

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1948-, McNally Patricia M., ed. The management mirror: How to create a behavioral feedback system that improves performance. Palm Harbor, FL: MDTA Press, 1991.

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Pineda, Jaime A., ed. Mirror Neuron Systems. Totowa, NJ: Humana Press, 2009. http://dx.doi.org/10.1007/978-1-59745-479-7.

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Craig, L. D. Deflections of a uniformly loaded circular plate with multiple support points. [Marshall Space Flight Center], Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 1999.

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1938-, Peat F. David, ed. Turbulent mirror: An illustrated guide to chaos theory and the science of wholeness. New York: Harper & Row, 1989.

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John, Briggs. Turbulent mirror: An illustrated guide to chaos theory and the science of wholeness. New York: Harper & Row, 1989.

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US Japan Workshop on Transport in Open-Ended Systems (1984 Nagoya-shi, Japan). Proceedings of the US-Japan Workshop on Transport in Open-Ended Systems: July 30-August 3, 1984, Nagoya, Japan. Nagoya, Japan: Institute of Plasma Physics, Nagoya University, 1985.

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Capítulos de libros sobre el tema "Mirror system"

Buccino, Giovanni. "Mirror Neuron System". En Encyclopedia of Sciences and Religions, 1326–28. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-1-4020-8265-8_1603.

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Hutchins, Tiffany, Giacomo Vivanti, Natasa Mateljevic, Roger J. Jou, Frederick Shic, Lauren Cornew, Timothy P. L. Roberts et al. "Mirror Neuron System". En Encyclopedia of Autism Spectrum Disorders, 1867–77. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-1698-3_570.

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Dinstein, Ilan y Marlene Behrman. "Mirror Neuron System". En Encyclopedia of Autism Spectrum Disorders, 2918–28. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-91280-6_570.

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Chong, Trevor T. J. y Jason B. Mattingley. "Automatic and Controlled Processing within the Mirror Neuron System". En Mirror Neuron Systems, 213–33. Totowa, NJ: Humana Press, 2008. http://dx.doi.org/10.1007/978-1-59745-479-7_10.

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Rizzolatti, Giacomo, Laila Craighero y Luciano Fadiga. "The mirror system in humans". En Mirror Neurons and the Evolution of Brain and Language, 37–59. Amsterdam: John Benjamins Publishing Company, 2002. http://dx.doi.org/10.1075/aicr.42.04riz.

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Nuara, Arturo. "Music and Mirror Neuron System". En Brain and Art, 67–79. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23580-2_7.

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Nehra, Kamalesh, Pachava Vengal Rao, Meesala Murali Mohan y Kurisetty Venkata Ravi. "Compact Unobscured Three Mirror System". En Springer Proceedings in Physics, 739–42. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9259-1_170.

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Oberman, Lindsay M. y V. S. Ramachandran. "Reflections on the Mirror Neuron System: Their Evolutionary Functions Beyond Motor Representation". En Mirror Neuron Systems, 39–59. Totowa, NJ: Humana Press, 2008. http://dx.doi.org/10.1007/978-1-59745-479-7_2.

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Southgate, Victoria, György Gergely y Gergely Csibra. "Does the Mirror Neuron System and Its Impairment Explain Human Imitation and Autism?" En Mirror Neuron Systems, 331–54. Totowa, NJ: Humana Press, 2008. http://dx.doi.org/10.1007/978-1-59745-479-7_15.

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Verma, Kuldeep, Ankita Agarkar y Apoorv Joshi. "Rts-Mirror: Real Time Synchronized Automated Rear Vision Mirror System". En Information Technology and Mobile Communication, 222–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20573-6_35.

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Actas de conferencias sobre el tema "Mirror system"

Zhao, Xin y Yong-jun Xie. "Three mirror anastigmatic zoom system using deformable mirrors". En International Symposium on Photoelectronic Detection and Imaging 2011, editado por John C. Zarnecki, Carl A. Nardell, Rong Shu, Jianfeng Yang y Yunhua Zhang. SPIE, 2011. http://dx.doi.org/10.1117/12.900730.

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Iqbal, Azhar y Foued Ben Amara. "Modeling of the Dynamic Surface Profile in Magnetic Fluid Mirrors". En ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16045.

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Magnetic fluid deformable mirrors (MFDMs) present a simple alternative to the expensive and delicate wavefront correctors currently in use in adaptive optics (AO) systems. Such mirrors are particularly suitable for retinal imaging AO systems. The practical implementation of a retinal imaging AO system incorporating a MFDM requires an effective control system to control the shape of the mirror surface. The real-time control of the mirror surface requires a model of the mirror that can be used to determine the dynamic response of the mirror to a magnetic field applied as the control input. This paper presents such a model that not only determines the dynamic response of the MFDM but also takes into account the unique requirements of the retinal imaging application of the mirrors. The mirror is modeled as a horizontal layer of a magnetic fluid. The dynamic response of the mirror to the applied magnetic field is represented by the deflection of the free surface of the layer. The surface deflection is determined by the modal analysis of the coupled fluid-magnetic system. Considering the requirements of the retinal imaging application, the effects of surface tension and depth of the fluid layer are duly represented in the model. The mirror model is described in a state-space form and can be readily used in the design of a controller to regulate the mirror surface shape.

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Moeenfard, Hamid, Ali Darvishian y Mohammad Taghi Ahmadian. "Analytical Solutions for the Static Instability of Micro/Nano Mirrors Under the Combined Effect of Capillary Force and Casimir Force". En ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63108.

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This paper deals with the problem of static instability of Micro/Nano mirrors under the combined effect of capillary force and Casimir force. At the First the governing equations of the statical behavior of Micro/Nano mirrors under the combined effect of capillary force and casimir force is obtained. The dependency of the critical tilting angle on the physical and geometrical parameters of the nano/micromirror and its supporting torsional beams is investigated. It is found that existence of casimir force can considerably reduce the stability limits of nano/micromirror. It is also found that rotation angle of the mirror due to capillary force highly depends on the casimir force applied to the mirror. Finally analytical tool Homotopy Perturbation Method (HPM) is utilized for prediction of the mirror’s behaviour under combined capillary and casimir forces. It is observed that a sixth order perturbation approximation accurately predicts the rotation angle and stability limits of the mirror. Results of this paper can be used for successful fabrication of nano/micromirrors using wet etching process where capillary force plays a major role in the system.

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English, Jeffrey D. "Thin Glass CSP Mirrors: “From Reflection to Concentration”". En ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36173.

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The goal for Concentrated Solar Power (CSP) mirror is not just reflection, but the complete capture and utilization of the entire solar spectrum. Solar radiation is emitted over a range of wavelengths, analytically measured between 250–2500 nm, to ensure maximum captivation. An effective solar mirror, utilized for concentrating this energy must be capable of maintaining a high level of reflectance, under adverse environmental conditions for a prolonged duration in a CSP system. Thin (1-mm) flat low-iron, silvered glass mirrors have been utilized for CSP applications for many years, but obstacles with respect to quality and durability have had to be overcome. Developments have improved the reflectance from averages in the low 90% range to averages between ∼96%–97%. The reflectance durability standard for utilization of mirror for solar applications requires a minimal reflective loss of less than 5% over a 15 year period in the field. The ultimate goal is to expand the solar mirror’s field life to 20–30 years, the life of a CSP system. Overcoming harsh accelerated testing parameters continues to be the focus, as these tests attempt to correlate the lifetime to actual field applications. Test chambers with elevated temperatures and humidity conditions continue to be the most severe, and results continually show dramatic improvement. Focus was drawn on the loss of spectral reflectance, as degradation was occurring at a rapid rate specifically with the lower wave spectra. Drawing on the expertise and direction of the National Renewable Energy Laboratory (NREL), CSP thin-glass mirrors are emerging to be a viable choice for solar concentration. Thinglass mirrors offer a low-weight, highly reflective option, that resists harsh weather conditions, including water and humidity variances along with surface contamination. Mirror coating advancements have exceeded the physical and chemical resistance properties of standard “off the shelf” mirror coating products to precise, industry specific components. This study will review the obstacles and highlight the progress that has led to the success of the thin-glass mirror CSP market. A compilation of test results from NREL and other analytical, laboratories along with the collaboration of mirror manufacturing expertise from a vast knowledge base in the chemically plated mirror industry. It is the primary focus of the industry to continue to strive for a superior quality concentrating mirror while making it economically viable to the solar industry.

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Lu, Yifan, Honghao Yue, Zongquan Deng y Hornsen Tzou. "Experiments on Quasi-Static and Dynamic Control of a PVDF Laminated Membrane-Like Mirror". En ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66265.

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Due to their merits of low areal density, in-orbit deploying and low manufacturing cost properties, membrane-like deformable mirrors meet the ultra-lightweight and large aperture demand of space optical mirror systems well. Membrane-like mirrors has therefore become a hot spot in the field of space science research now. Surface of these in-orbit membrane-like structures are susceptible to external environment variation on account of their low stiffness and high flexibility properties. Once excited by external excitations, the membrane vibration endures and this would not only degrade its performance, but also lead to system or structural failures. So dynamic vibration control of the membrane-like mirror is indispensable. When the orbiting mirror passes from Earth’s shadow into sunlight, the surface temperature of the mirror changes and this will render membrane thermal distortion. Hence, quasi-static surface error adjustment of the mirror is also requisite. In this paper, a 0.2m diameter scaled-down Kapton membrane-like mirror is taken as the experiment subject. Polyvinylidene Fluoride (PVDF) patches are laminated on the non-reflective side of the mirror as in-plane actuators. High precision laser displacement sensors are used to measure the surface deviation of the mirror. A modal vibration control system based on the positive position feedback (PPF) algorithm and a quasi-static surface control system based on the proportional error feedback algorithm are established respectively. Several mirror control experiments are performed and the results indicate that the methods proposed could suppress the membrane vibration and alleviate the membrane thermal deformation effectively.

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Sidorov, Victor I. y Nicolay A. Lavrov. "Segmented mirror control system". En 1994 Symposium on Astronomical Telescopes & Instrumentation for the 21st Century, editado por Mark A. Ealey y Fritz Merkle. SPIE, 1994. http://dx.doi.org/10.1117/12.176030.

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Hampton, Peter J., Colin Bradley, Aaron Hilton y Pan Agathoklis. "Multiple mirror control system". En SPIE Astronomical Telescopes + Instrumentation. SPIE, 2004. http://dx.doi.org/10.1117/12.551950.

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Liu, XinPing, Yingcai Li y Jianfeng Yang. "Two-mirror optical system with a small fold mirror". En International Optical Design Conference, editado por Leo R. Gardner y Kevin P. Thompson. SPIE, 1998. http://dx.doi.org/10.1117/12.322028.

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ARBIB, MICHAEL A., JAMES BONAIUTO y EDINA ROSTA. "THE MIRROR SYSTEM HYPOTHESIS: FROM A MACAQUE-LIKE MIRROR SYSTEM TO IMITATION". En Proceedings of the 6th International Conference (EVOLANG6). WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812774262_0001.

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Alon, Lital, Gregory Ravikovich, Matan Mandelbrod, Udi Eilat, Zafrir Schop y Dror Tamari. "Computer-Based Management of Mirror-Washing in Utility-Scale Solar Thermal Plants". En ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6562.

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BrightSource solar power plants consist of fields of tens of thousands of mirrors, spread across kilometers of open areas. These huge mirrors are in constant motion, reflecting the sun’s rays on to the solar thermal collector. Maintaining high reflectivity of the mirrors is essential for the solar field’s performance, a task that becomes complex when expanded to encompass the solar field’s features. The solution for mirror cleaning must be efficient, cost-effective, time-saving, and easy to maintain for dozens of years. BrightSource has designed and constructed a system of GPS-based mirror washing machines (MWMs) that are controlled and managed by end-to-end software. The system generates optimized cleaning tasks, positions the mirrors, and efficiently controls the navigation and state of the MWMs with their 25-meter-long extendable cranes. All of these actions together provide an optimal mirror cleaning solution. This article describes the BrightSource cleaning control technology, for example, in the Ivanpah project, the world’s largest solar thermal facility. The Ivanpah solar field includes 173,500 heliostats divided among three solar fields. Each heliostat holds two mirrors of approximately 2.5 × 3.5 meters, all of which require periodic cleaning. Specifically, this article addresses issues such as the following: • The mirror washing machine (MWM) types: truck and tractor-based, and their differing usage in the solar field • Designation and choice of the cleaning area • Estimation of the stopping points in the designated area, and association of the mirrors to clean from each stopping point • Cleaning time optimization: stopping point density, order in which to clean heliostats, and heliostat position during cleaning • Heliostat positioning: opening clear corridors through which the MWM can travel, and setting heliostats in cleaning orientations • Receiving and responding to callback messages from the MWMs, such as cleaning progress and machine faults • Working in the real world: resources shared with the power plant, and recovery from system faults

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Informes sobre el tema "Mirror system"

McCullough, Maria y Marc Selinger. Boeing Demonstrates Aerospace Relay Mirror System -- Presentation (Postprint). Fort Belvoir, VA: Defense Technical Information Center, agosto de 2006. http://dx.doi.org/10.21236/ada495239.

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Ulander, Klaus. Two-axis Beam Steering Mirror Control system for Precision Pointing and Tracking Applications. Office of Scientific and Technical Information (OSTI), enero de 2006. http://dx.doi.org/10.2172/893570.

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Klingsporn, P. E. Characterization of mirror and polished surfaces with a digital interferometric measurement system. Final report. Office of Scientific and Technical Information (OSTI), mayo de 1997. http://dx.doi.org/10.2172/527571.

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Ng, D. S. Static and dynamic analyses on the MFTF (Mirror Fusion Test Facility)-B Axicell Vacuum Vessel System: Final report. Office of Scientific and Technical Information (OSTI), septiembre de 1986. http://dx.doi.org/10.2172/6977248.

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Ritschel, A. J. y W. L. White. Mirror Fusion Test Facility-B (MFTF-B) axicell configuration: NbTi magnet system. Manufacturing/producibility final report. Volume 2. Office of Scientific and Technical Information (OSTI), mayo de 1985. http://dx.doi.org/10.2172/5365947.

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Heathman, J. H. y J. W. Wohlwend. Mirror Fusion Test Facility-B (MFTF-B) axicell configuration: NbTi magnet system. Design and analysis summary. Volume 1. Office of Scientific and Technical Information (OSTI), mayo de 1985. http://dx.doi.org/10.2172/5292610.

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Reid, R. L., P. A. Finn, M. Y. Gohar, R. J. Barrett, G. E. Gorker, P. T. Spampinaton, R. H. Bulmer, D. W. Dorn, L. J. Perkins y S. Ghose. Tandem Mirror Reactor Systems Code (Version I). Office of Scientific and Technical Information (OSTI), septiembre de 1985. http://dx.doi.org/10.2172/5211439.

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Simonen, T. C., A. H. Futch y T. B. Kaiser. Development of magnetic mirror systems for nuclear testing applications. Office of Scientific and Technical Information (OSTI), agosto de 1986. http://dx.doi.org/10.2172/5441642.

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Moir, R. Magnetic mirror fusion-fission early history and applicability to other systems. Office of Scientific and Technical Information (OSTI), agosto de 2009. http://dx.doi.org/10.2172/964097.

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Henson, T. D., J. C. Wehlburg, J. M. Redmond, J. A. Main y J. W. Martin. Thin-Skin Deployable Mirrors for Remote Sensing Systems. Office of Scientific and Technical Information (OSTI), enero de 2001. http://dx.doi.org/10.2172/773989.

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