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How to Make Your Own Spectrometer

A spectrometer is a device that is designed to detect the unique light patterns that different elements emit. By studying the light that a substance gives off, it is possible to identify the elements in it. A professional spectrometer is an expensive, complex and delicate instrument. However, the basic principles behind a spectrometer only require an object that will refract light into its different wavelengths, and you most likely have an object that will do this in your home: a compact disc. A CD spectrometer is accurate enough for a simple lab activity or to conduct experiments with lights at home.

Things You'll Need

CD
Craft knife
Ruler
Small cardboard box
Glue or tape

Instructions

- 1
  Place a CD with no or few scratches on flat surface. CDs that are commercially made, as opposed to burned CDs, are best because they have clear rather than tinted backs. Using a craft knife and a ruler to guide your cuts, score two lines between the outer edge of the CD and the middle to form a wedge shape. When you have scored deeply enough, the CD should break easily along those two lines. Be sure to only use a CD that you do not want, as this process destroys the CD. If you are worried about sharp edges, cover the cut edges with tape or sand them down.
- 2
  Place a small cardboard box on the flat surface. A large matchbox or a jewelry box works well. Cut a large slit in the top towards one end of the box using the craft knife. This creates a window for you to look through.
- 3
  Cut a slit into the other end of the box, opposite your window. This lets some light into the box.
- 4
  Open the box and place the CD piece in the bottom, shiny or reflective side up. Attach it to the bottom of the box with glue or tape on the dull side of the CD piece.
- 5
  Point the spectrometer at a light source, with the window facing up towards you so that you can see inside of the box. If you do not see the CD piece or if there is not enough light entering the box, adjust the size of the slits in the box or the reposition of the CD until you can see the spectrum.

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