Yes, it is basically a colormeter. If you take light and run it through
a prism and break it into its various colors, then have a slit where
only one color gets through, and take a reading of the intensity of that
color, move the prism so one of a slightly different frequency goes
through the slit and measure it, then graph the results vs wavelength,
that is what you get. Well actually what is plotted is the amount of
absorption above what distilled water gives, not the amount that gets
through.
The reason these instruments can show large absorption band in water
that otherwise appears clear is that the absorption bands are in thee uv
or ir range, which we cannot see. If we could, then we would see that
blessing water actually changes its color right before our eyes!
For more information see: http://en.wikipedia.org/wiki/Monochromator
Also google search for "scanning spectrophotometer".
Marshall
On 9/8/2011 5:44 PM, David AuBuchon wrote:
Can we get a layman's intro to spectrometers? Here is my understanding:
Light of various wavelengths is sent through a material. In this
case, a silver particle of a given diameter will absorb light of a
particular wavelength which is some function of the particle's
diameter. Therefore only some fraction of light with that wavelength
will reach a receiver on the other side of material. Light of
wavelengths greater than any particle can absorb, according to this
relation, will 100% reach the receiver. Based on how much of each
wavelength of light reaches the reciever, the plots are made.
Is this a correct understanding?
~David
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