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Usin g a Cl assro om P roject or to Stu dy th e Pro perti es of L ight

Usin g a Cl assro om P roject or to Stu dy th e Pro perti es of L ight. Drs. Michael Ottinger and Brian Bucklein Missouri Western State University St Joseph, MO 64507 Missouri Association of Physics Teachers Meeting November 6, 2010. Outline. Creating a Three-Color Image (RGB)

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Usin g a Cl assro om P roject or to Stu dy th e Pro perti es of L ight

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  1. Using a Classroom ProjectortoStudythePropertiesofLight Drs. Michael Ottinger and Brian BuckleinMissouri Western State UniversitySt Joseph, MO 64507 Missouri Association of Physics Teachers MeetingNovember 6, 2010

  2. Outline • Creating a Three-Color Image (RGB) • How LCD and LCoS Projectors create color images • Obtaining and Using Spectral Glasses • Demonstration of the Separation and Mixing of Colors • Demonstration of the Polarization of Light

  3. Three Color Image System Low Pass Red Image Green Image High Pass Object RGB Filters Blue Image

  4. Three Color Image System Red Lamp Red Image Superimpose Images Blue Lamp Blue Image Green Lamp Green Image

  5. Methods for Reproducing RBG • Digital Light Processing (DLP) • Liquid Crystal Display (LCD) • Liquid Crystal on Silicon (LCoS)

  6. Digital Light Processing (DLP)

  7. Liquid Crystal Display (LCD)

  8. Liquid Crystal Display (LCD)

  9. Liquid Crystal Display (LCD)

  10. LCD Projector • Light Source (Bulb) • Polarizer Lens • Beam Splitter • Low Pass Mirror (red passes/ blue and green reflected) • High Pass Mirror(blue passes / green reflected)) • 3 LCD’s (one per color) • Dichroic Combiner Cube

  11. Dichroic Combiner Cube

  12. Liquid Crystal over Silicon

  13. An LCoS Projector

  14. LCoS Projector UHP Mercury Lamp Note: Green is Polarized Perpendicular to Red and Blue

  15. Using the Projector to Study Colors • Diffraction Grating Glasses • Available through manycompanies for about $0.25 to $0.45 each • 500 lines/mm, linear diffraction grating

  16. Breaking down the Colors • The following slides were made by using the “Shapes” drop down in PowerPoint to make two thin rectangular lines. • The top line was set to white and, using the color setting the bottom line was set to different color combinations.

  17. Please put on your spectral glasses

  18. White

  19. Red

  20. Green

  21. Blue

  22. Yellow =Red+Green

  23. Magenta=Red+Blue

  24. Cyan=Green+Blue

  25. White=Red+Blue + Green

  26. You may remove your spectral glasses

  27. Polarization • LCD and LCoS Projectors use Polarized Light • Typically the Red and Blue have the same polarization • Green is polarized perpendicularly to the Red and Green

  28. Conclusions • Classroom projectors create images from three color regions of polarized light (RGB) • Using the projector and inexpensive spectral glasses you can demonstrate color mixing. • Polarization of light can be demonstrated from the different polarizations of the light

  29. End of Presentation

  30. Pictures were taken by placing the spectral glasses on the front of a digital camera Pictures of Spectral Lines

  31. Polarization of Projector Light

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