Christian VILADRICH's home page

(last update: November 27, 2021)

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Miscellaneous topics :

• Optics :
  • Fabry-Perot etalons
  • Sweet spot, banding and tilted etalons
  • Testing Fabry-Perot etalons and Ca K filters: methods and results (SM40, PST, SM III 60, SM III 60 RichView, etc.)
  • Analysis of Fabry-Perot etalons (Daystar, Coronado) for Ha solar observations
  • Impact of tilt on a telecentric assembly
  • Impact of FWHM on solar limb images
  • Optical systems
  • Comparison of the theoritical performance of various telescope designs (Newton, Dall-Kirkham, Gregory, Ritchey-Chretien, Cassegrain, Schmidt-Cassegrain) for high resolution imaging (simulations with OSLO software)
  • Simulation of the theoritical perfomance of the Celestron 14 for high resolution imaging
  • Optimisation of the Schmidt plate position in the "classic" C14 design
  • Optimisation of the Schmidt plate position in the "classic" C8 design
  • Optical performance of Takahashi Mewlon 250 CRS in white light and UV
  • Comparison of Barlow lenses for high resolution imaging
  • Spider diffraction
  • Central obstruction diffraction
  • Filter transmission profile data base
  • UV transmission of some Barlow lenses
  • Seeing and height of the telescope
• Instruments :
  
  • IR emission and OTA thermal balance
  • A 300 mm Newtonian solar telescope
  • Ca K observation techniques
  • Mesurements of D-ERF Baader filter optical quality (HASO)
  • Focusing devices
  • Periodic error measurements of equatorial mountings
  • Basler 1955-155 (IMX174) : comparison between 8 and 12 bits mode
  • Various tests (Barlow lens, MPEG/DV compression, etc)
  • Test of calibrated laptop computer screen
  • Comparison of DV and MPEG2 compression for video camera acquisition
  • B/W raw webcam : influence of acquisition speed on image quality

• ROS2021 : methodology for measuring etalon characteristics (Ca II et Ha)
• RCE2021 : derniers progrès en haute résolution solaire (visible, Ca II et Ha)
• RCE2018 : Haute résolution solaire en visible et proche UV
• ROS2018 : Haute résolution solaire à St Véran
• RCE2016 : recent advances in high resolution solar imaging
• 2015 : a 300 mm solar telescope
• 2015 : optimisation of Ha F-P etalon
• 2015 : Solar Scintillation Monitor
• Nov 2014 : High resolution lunar imaging
• RCE Nov 2014 : High resolution lunar imaging
• RCE Nov 2014 : High resolution solar imaging part 1
• RCE Nov 2014 : High resolution solar imaging part 2
• AIP : High resolution solar imaging (June 2014)
• AIP : High resolution planetary and lunar imaging (June 2014)
• AIP : Turbulence and seeing (June 2014)
• AIP : Animation of solar imaging (June 2013)
• RCE Nov 2012 : Autostakkert 2 and high resolution solar imaging
• Serbannes - Juin 2012 : High resolution solar imaging - Presentation given at the Rencontre des Observateurs du soleil
• RCE Nov 2010 : Avistack software - Presentation given at the Rencontres du Ciel et de l'Espace - Cité des Sciences - Paris
• High resolution Ca K solar imaging (written with Serge Koutchmy - Astrophysical Institute of Paris) - Astrosurf Magazine 2010
• High resolution lunar imaging - Astrosurf Magazine - 2008

Last updates :

• 1 November 2021 : evaluation of the theoritical performances of a RC 500 f/3-8 for hight resolution imaging
• 2 October 2021 : Jupiter, Uranus, Neptune and lunar images taken on Septembre 22 with the RC 500 mm
• 29 August 2021 : Jupiter, Saturn and solar images taken with St Véran RC 500 mm
• 14 July 2021 : measurement of two PST etalons
• 29 May 2021 : impact of tilt on a telecentric assembly
• 30 April 2021 : Ha solar images
• 28 March 2021 : Ca K solar images
• 26 February 2021 : sweet spot, banding and tillted etalon
• 17 January 2021 : testing Fabry-Perot etalon
• 15 November 2020 : new images of Mars opposition,    images of the Moon taken on August and September 9,   Ha image of the Sun taken on November 12 
• 13 August 2020 : Mars RGB image taken with the C14 on August 9
• 13 August 2020 : Ca K images taken with the 300 mm solar Newtonian at St Véran observatory
• 16 July 2020 :comet Neowise images
• 9 July 2020 : Mercury images taken on May 27 and 31, comet Neowise images taken on 9 July
• 2 June 2020 : solar Ca K images taken on May 30
• 23 May 2020 : image of the thermal radiation of Venus at 1 micron
• 26 April 2020 : solar Ha images taken on April 4 and 5
• 2 April 2020 : images of AR2759 in Ca K taken on April, 2
• 23 March 2020 : images of Venus in UV taken on March 14, 19, 20 and 2 with the Mewlon 250.
• 1 February 2020 : high resolution solar images taken in Ha with the C8 EdgeHD and double stack DayStar PE 0.6A and Coronado SMN35 0.5 A St Veran observatory

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