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IFTSUV: an Imaging Fourier Transform Spectrometer in the UV

IFTSUV: an Imaging Fourier Transform Spectrometer in the UV. Anne Millard, 3 rd year PhD student, directed by P. Lemaire and J.-C. Vial. Scientific objectives. Add spectral information to 2D images

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IFTSUV: an Imaging Fourier Transform Spectrometer in the UV

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  1. IFTSUV: an Imaging Fourier Transform Spectrometer in the UV Anne Millard, 3rd year PhD student, directed by P. Lemaire and J.-C. Vial

  2. Scientific objectives • Add spectral information to 2D images Spectra of large structures / structures simultaneously on different positions on the Solar disk • Detection of explosive events and fast moving phenomenons • Speed distribution: horizontal (imaging) and vertical (spectroscopy) • Resolve small structures FSCSI 18-19 novembre 2004

  3. Instrument specifications • Wavelength: H-Lyman  (121.6 nm) • Spectral resolution: =0.02nm • Depending on the mission: • Orbit: heliosynchronous preferred (high TM rates) • FOV and spatial resolution: • Telescope 3 cm : Field: 01.1R33' x 33' , r = 1"  high resolution • Telescope 30 cm : Field: 30" x 30", r = 0.1" very high resolution FSCSI 18-19 novembre 2004

  4. Intensity due to spectral component dk Total intensity in the interference pattern Spectral distribution of intensity Working principle k=1/ = OPD FSCSI 18-19 novembre 2004

  5. Simulations FSCSI 18-19 novembre 2004

  6. IFTSUV mock-up • Folded Michelson, compact and symetric. • =200nm • Scanning mirror on a nanopositioning translation stage. • Beam splitted by central diffraction grating. • Beams recombined at the focus of an off axis parabola. FSCSI 18-19 novembre 2004

  7. Paramètres :  = 200 nm R = 4000 = 0.05 nm   = 0.08cm-1  = 25nm Mirror step : 110nm Maximum OPD : ~800 m Measurement points : ~3700 Sources : Visible : red laser 633 nm frequency stabilised and green laser 543.5 nm UV : continuum (white light) + rays (hollow cathode lamp) Detection : Visible : CCD (COHU 4710), 699 x 576 pixels (9.2 m x 8.3 m) UV : EMCCD (ANDOR tech DV 887), 512 x 512 pixels (16 m x 16 m), back illuminated, MgF2 window IFTSUV mock-up parameters FSCSI 18-19 novembre 2004

  8. IFTSUV mock-up Possibility to control the positionning in visible light while working in UV. FSCSI 18-19 novembre 2004

  9. First result FSCSI 18-19 novembre 2004

  10. Difficulties • Measurement of the OPD. • Maintaining the superpositions of the images at the focus on the whole scanning range. • Air flow and variation of environment parameters. • Synchronous management of all the electric systems involved in the instrument (detection, control, command) FSCSI 18-19 novembre 2004

  11. Next steps • Search of the position OPD = 0 using a combinaison of 2 lasers • Set-up of the UV path ( sources and detector) FSCSI 18-19 novembre 2004

  12. Thank you

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