Browsing by Author "Tonnellier, Xavier"

Browsing by Author "Tonnellier, Xavier"

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  • Grinding metre scale mirror segments for the E-ELT ground based telescope 
    Comley, Paul; Morantz, Paul; Shore, Paul; Tonnellier, Xavier (Technische Rundschau, Hallwag Publishers; 1999, 2011-04-21)
    The next generation of ground based telescopes require many hundreds of metre scale off-axis mirrors. In this paper the grinding of a 1.45m scale Zerodur® mirror segment for the European Extremely Large Telescope (E-ELT) ...
  • Light source selection for a solar simulator for thermal applications: A review 
    Tawfik, Mohamed M.; Tonnellier, Xavier; Sansom, Christopher L. (Elsevier, 2018-04-24)
    Solar simulators are used to test components and systems under controlled and repeatable conditions, often in locations with unsuitable insolation for outdoor testing. The growth in renewable energy generation has led to ...
  • Limiting travel speed in additive layer manufacturing 
    Adebayo, Adeyinka; Mehnen, Jorn; Tonnellier, Xavier (2013-04-16)
    Wire and Arc Additive Manufacture (WAAM) is new approache to modern manufacturing. This technology has been gaining the interest of the research community due to its high deposition rate and efficiency. In Wire and Arc ...
  • A method for assessing measurement precision and stability of optical probes 
    Norman, James; Tonnellier, Xavier; Morantz, Paul (European Society for Precision Engineering and Nanotechnology, 2016-06-30)
    The current strategy for measuring non-specular metre-scale surfaces – for instance segmented freeform optics post-grinding – in the mid- frequency bandwidths (S-filter), involves the use of contact probe based systems ...
  • Precision Engineering behind European Astronomy Programmes 
    Tonnellier, Xavier; Shore, Paul (2011-03-14)
    The fields of astronomy science have presented significant precision engineering challenges. Numerous solutions for these fields of science have achieved unprecedented levels of accuracy, sensitivity and sheer scale. ...
  • Precision grinding for rapid fabrication of segments for extremely large telescopes using the Cranfield BoX 
    Tonnellier, Xavier; Morantz, Paul; Shore, Paul; Comley, Paul (International Society for Optical Engineering; 1999, 2012-07-11)
    An ultra precision large optics grinding machine, BoX®, was developed and produced at Cranfield University. BoX® offers a rapid and economic solution for grinding large off-axis aspherical and free-form optical components. ...
  • Precision Grinding for Rapid Manufacturing of Large Optics 
    Tonnellier, Xavier (Cranfield University, 2009-05)
    Large scale nuclear fusion and astronomy scientific programmes have increased the demand for large freeform mirrors and lenses. Thousands of one metre class, high quality aspherical optical components are required within ...
  • Sub-surface damage issues for effective fabrication of large optics 
    Tonnellier, Xavier; Shore, Paul; Morantz, Paul; Baldwin, A.; Walker, D.; Yu, G.; Evans, R. (2008-07-14)
    A new ultra precision large optics grinding machine, BoX®has been developed at Cranfield University. BoX®islocated at the UK's Ultra Precision Surfaces laboratory at the OpTIC Technium. This machine offers a rapidand ...
  • Subsurface damage in precision ground ULE® and Zerodur® surfaces 
    Tonnellier, Xavier; Morantz, Paul; Shore, Paul; Baldwin, A.; Evans, R.; Walker, D. D. (Optical Society of America (OSA), 2007-09-17)
    The total process cycle time for large ULE®and Zerodur®optics can be improved using a precise and rapid grinding process, with low levels of surface waviness and subsurface damage. In this paper, the amounts of defects ...
  • Surface quality of a 1m Zerodur part using an effective grinding mode 
    Tonnellier, Xavier; Shore, Paul; Morantz, Paul; Orton, D. (2012-07-11)
    A new ultra precision large optics grinding machine, BoX(R), has been developed at Cranfield University. This machine is located at the UK's Ultra Precision Surfaces laboratory at the OpTIC Technium, North Wales. This ...
  • Theoretical and experimental analysis of an innovative dual-axis tracking linear Fresnel lenses concentrated solar thermal collector 
    Perini, Simoni; Tonnellier, Xavier; King, Peter; Sansom, Christopher L. (Elsevier, 2017-06-21)
    Linear concentrating solar thermal systems offer a promising method for harvesting solar energy. In this paper, a model for a novel linear Fresnel lens collector with dual-axis tracking capability is presented. The main ...
  • Thermal effects compensation and associated uncertainty for large magnet assembly precision alignment 
    Doytchinov, Iordan; Shore, Paul; Nicquevert, Bertrand; Tonnellier, Xavier; Heather, A.; Modena, Michele (Elsevier, 2019-06-12)
    Big science and ambitious industrial projects continually push technical requirements forward beyond the grasp of conventional engineering techniques. An example of these are the extremely tight micrometric assembly and ...
  • Towards the development of the supply chain of concentrated solar power 
    Tjahjono, Benny; Martinez-Conde Moreno, Javier; Tonnellier, Xavier; Schaeffer, Roberto; Portugal-Pereira, Joana (International Federation of Logistics and SCM Systems, 2016-07-29)
    This work focuses on the investigation into the planning of renewable energy power plants in Brazil using the Concentrated Solar Power (CSP) technology. The main aim of the paper is to present an analysis of the planning ...