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Designing a High Resolution Fiber-Fed Spectrograph for Solar Observations

Designing a High Resolution Fiber-Fed Spectrograph for Solar Observations. Edmond Wilson Brennan Thomason Stephanie Inabnet Tamara Reed Harding University. Project Goal.

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Designing a High Resolution Fiber-Fed Spectrograph for Solar Observations

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  1. Designing a High Resolution Fiber-Fed Spectrograph for Solar Observations Edmond Wilson Brennan Thomason Stephanie Inabnet Tamara Reed Harding University

  2. Project Goal Design a spreadsheet program to aid in optimizing the light throughput of a Czerny-Turner Spectrograph fed by an optical fiber

  3. Czerny-Turner Monochromator Configuration http://terpconnect.umd.edu/~toh/models/Monochromator.png

  4. The model for our instrument is based on the discussion in Chapter 1 of the book, Guide for Spectroscopy, by JobinYvon/SPEX, 1994. Figure 1 below was created from Figure 3 in the book, with errors in the original figure corrected. Although the light path of a Czerny-Turner spectrometer is usually folded, mathematically, it can be treated as if the light path were arranged linearly without changing the results.

  5. Equivalent Optical Path for Czerny-Turner Spectrometer

  6. Begin with a grating….

  7. Collimating Mirror Next

  8. Camera

  9. Slit Parameters

  10. Fiber Parameters

  11. Begin the Calculations

  12. Complete Optical Path Optimization for a Czerny- Turner Spectrograph that Employs a Fiber Optic Cable to Supply Light to the Entrance Slit • Step 1. Calculate the entendue of the light source, G where S = area of light source, mm2 and r = radius of fiber, mm where G = geometric entendue, S = area of light source, NAf= numerical aperture of the fiber

  13. Step 2. Calculate the entendue, G, of the spectrometer Step 2a. Calculate the entendue of the spectrometer assuming a bandpass of 0.5 nm at 500 nm

  14. Step 3. Re-image light from fiber to match it with the entendue of the monochromatorso that the loss of photons and effect of stray light is minimized. This involves choosing Lens L1 in Figure 1. This is somewhat arbitrary.You must choose a focal length and diameter for lens L1

  15. Thin lens equation Therefore, all the light from the fiber is collected by a lens, L1, with an object distance of p mm and will project an image of the fiber core on the spectrometer entrance slit q mm from lens, L1

  16. Therefore, all the light from the fiber is collected by a lens, L1, with an object distance of p mm and will project an image of the fiber core on the spectrometer entrance slit q mm from lens, L1

  17. Acknowledgement Thank you! Arkansas Space Grant Consortium Montana Space Grant Consortium

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