Browsing by Author "Jourdain, Renaud"

Browsing by Author "Jourdain, Renaud"

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  • Yu, Nan; Jourdain, Renaud; Gourma, Mustapha; Shore, Paul (Springer, 2016-02-27)
    Plasma figuring is a dwell time fabrication process that uses a locally delivered chemical reaction through means of an inductively coupled plasma (ICP) torch to correct surface figure errors. This paper presents two ...
  • Yu, Nan; Jourdain, Renaud; Gourma, Mustapha; Shore, Paul (European Society for Precision Engineering and Nanotechnology, 2016-06-30)
    For addressing the correction of Mid Spatial Frequency (MSF) errors on metre scale optical surfaces induced by sub aperture figuring process, a new generation of non-contact plasma based surface figuring tools has been ...
  • Jourdain, Renaud; Castelli, MAco; Yu, Nan; Gourma, Mustapha; Shore, Paul (Elsevier, 2016-08-06)
    The focus of this work is the determination of the heat flux function -thermal footprint- of a plasma jet generated by an inductively coupled plasma (ICP) torch. The parameters of the heat flux function were determined ...
  • Castelli, Marco; Jourdain, Renaud; Morantz, Paul; Shore, Paul (2012-09-13)
    The next generation of ground-based astronomical observatories will require fabrication and maintenance of extremely large segmented mirrors tens of meters in diameter. At present, the large production of segments required ...
  • Parkins, Jonathon (Cranfield University, 2012-08)
    Laser assisted plasma processing (LAPP) is a novel extension to already established Reactive Atom Plasma (RAP) processing for atmospheric pressure dry chemical etching of silicon based materials; this is mainly applied for ...
  • Yu, Nan; Jourdain, Renaud; Gourma, Mustapha; Shore, Paul (Trans Tech Publications, 2015-08-20)
    To satisfy the worldwide demand for large ultra-precision optical surfaces, a fast process chain - grinding, polishing and plasma figuring- has been established by the Precision Engineering Institute at Cranfield University. ...
  • Bennett, Adam; Jourdain, Renaud; Kirby, Paul; MacKay, P.; Shore, Paul; Nicholls, John; Morantz, Paul (European Society for Precision Engineering and Nanotechnology, 2016-06-30)
    Activated plasma figuring using microwaves aims at providing highly efficient activated energy beams for rapid fabrication of optics. The chemical nature of this type of energy beam leads to targeting silicon-based ...
  • Jourdain, Renaud; Castelli, Marco; Shore, Paul (2010-06-01)
    Recently established the Helios 1200 (RaptTM ) is a unique facility designed for the figuring of large optical surfaces [1]. It combines a CNC machine tool with a reactive atom plasma (RAP) process. This provides a unique ...
  • Jourdain, Renaud; Castelli, Marco; Shore, Paul; Sommer, P.; Proscia, David (Springer, 2013-04-11)
    A new surface figuring machine called Helios 1200 is presented in this paper. It is designed for the figuring of meter sized optical surfaces with form accuracy correction capability better than 20 nm rms within a reduced ...
  • Yu, Nan (Cranfield University, 2016-10)
    In 2012, plasma figuring was proven to be an alternative solution for the fabrication of large scale ultra-precise optical surfaces. Indeed, plasma figuring was successfully demonstrated on a metre class glass surface. The ...