Difference between revisions of "Spectroscope"

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m (Prism spectroscope)
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[[image:absorption_red.jpg|framed|left|absorption of all wavelengths except red]]
[[image:absorption_purple.jpg|framed|left|absorption of all wavelengths except red and blue]]
===Types of spectroscopes===
===Types of spectroscopes===

Revision as of 05:06, 7 September 2006

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Doos 03:37, 28 July 2006 (PDT)

The spectroscope is a tool to examin which parts of white light are absorbed by a gemstone (as well as in other materials).
Materials can absorb parts of the electromagnetic spectrum and when the absorbed parts fall with in the visible range, that absorbed part will influence the color of the material.
When a gemstone is observed with a spectroscope, the absorbed parts show as dark lines and/or bands in the spectroscope image.

OPL teaching diffraction grating spectroscope on stand (left) and prism spectroscope with adjustable slit (right)

There are two types of spectroscopes used in gemology:

  1. Prism spectroscopes (based on dispersion)
  2. Diffraction grating spectroscopes (based on diffraction)



absorption of all wavelengths except red
absorption of all wavelengths except red and blue

Types of spectroscopes

Prism spectroscope

prism spectrum

prism spectrum with scale in nm

Diffraction grating spectroscope

diffraction grating spectrum

diffraction grating spectrum with scale in nm

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