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Physics 681: Solar Physics and Instrumentation – Lecture 8

Physics 681: Solar Physics and Instrumentation – Lecture 8. Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research. Spectroscopy. Grating Spectrograph Lyot Filter Fabry-Pérot Interferometer Please check your TurnItIn.com account!. Grating Spectrograph.

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Physics 681: Solar Physics and Instrumentation – Lecture 8

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  1. Physics 681: Solar Physics and Instrumentation – Lecture 8 Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research

  2. Spectroscopy • Grating Spectrograph • Lyot Filter • Fabry-Pérot Interferometer • Please check your TurnItIn.com account! Center for Solar-Terrestrial Research

  3. Grating Spectrograph • Collimate light beam on spectrograph slit • Focal ratio of collimator • Grating equation • Angular dispersion • Linear dispersion http://outreach.atnf.csiro.au/education/senior/astrophysics/spectrographs.html Center for Solar-Terrestrial Research

  4. Center for Solar-Terrestrial Research

  5. Lyot Filter • Birefringent filter • Alternating sequence of polarizers and birefringent crystals • Polarizers are mounted parallel to each other • Uniaxial crystals cut parallel to their optical axis • Optical axis of crystals and polarizers make a 45º angle • Thickness of the nth crystal plate • Phase difference and birefringence • Interference of two waves passing a single element Center for Solar-Terrestrial Research

  6. Intensity • Transmission maxima • Separation • N elements between N + 1 polarizers • Individual transmission maxima at • Central wavelength Center for Solar-Terrestrial Research

  7. ½ Wave Plate LC Crystal Polarizer Calcite Plates NIR Lyot-Filter Design Center for Solar-Terrestrial Research

  8. Band width • Birefringence (calcite J = –0.172 and quartz J = 0.0092) Center for Solar-Terrestrial Research

  9. Fabry-Pérot Interferometer • Phase difference • Outgoing wave • Intensity Center for Solar-Terrestrial Research

  10. Band width • Finesse http://www.physicsdaily.com/physics/Fabry-Perot Center for Solar-Terrestrial Research

  11. Coating Curves Center for Solar-Terrestrial Research

  12. Filter Transmission and Spectrum Center for Solar-Terrestrial Research

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