Data taking with further lamps

  • 2 remaining lamps:
    • Lamp 1 - Sodium
    • Lamp 2 - Cadmium, Mercury and Zinc combination
  • For Lamp 1; started at 0.0mm, took frames of 0.5s exposure time increasing in 0.5mm increments up to 12mm
  • For Lamp 2; started at 0.0mm, took frames of 0.5s exposure time increasing in 0.5mm increments up to 12mm.
  • For Lamp 2, had to put a piece of paper in between fibre optics and lamp as it was incredibly bright

Spectroscopic Flats/Darks

  • Used halogen lamp which has a broadband spectrum
  • Took frames of exposure time 0.5s, started at 0.0mm, increasing in 0.5mm increments up to 12mm
  • If you were to plot the whole spectrum, one would see that towards the edges the intensity will decrease; this is because the camera is not sensitive to all wavelengths - further calibration

Scanning of individual spectral lines

  • By observation, one can see that spectral lines become more out of focus when they are closer to the edges of the frame.
  • For each lamp, scan each individual (bright) spectral line across the entirety of frame
  • Plot the standard deviation of the line against the micrometer position to see how much wider the line gets as it approaches the egdes
  • For the mixed lamp (Cd, Hg, Zn), found a bright line and took frames increasing in increments of 0.05mm at 0.5s exposure time to record the scan. Found this was excessive, so for all other lines and lamps, increased in increments of 0.1mm.
  • Mixed lamp: scanned 3 lines
  • Sodium lamp: scanned 1 lines (so far)
  • Cadmium lamp: scanned 3 lines
  • Helium lamp: scanned 3 lines
-- AshleaKemp - 13 Nov 2015

Physics WebpagesRHUL WebpagesCampus Connect • Royal Holloway, University of London, Egham, Surrey TW20 0EX; Tel/Fax +44 (0)1784 434455/437520

Topic revision: r3 - 14 Nov 2015 - JosephBayley

 
This site is powered by the TWiki collaboration platformCopyright © 2008-2018 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback