VISIBLE AND NIR SPECTROMETER

SCIENCE OBJECTIVE:

INSTRUMENT DESCRIPTION: This project is similar to the UV spectrometer but
extends over the range of 400 to about 1000 nm and uses a linear array of 1024 photodiodes for a
resolution of about .6 nm.  Its optical design and project requirements are essentially the same.

 A typical commercial unit can be viewed at:

http://www.oceanoptics.com/Products/hr4000cguvnir.asp

Another version of a spectrometer uses a grism.  A grism is a combination of a grating and a prism.

For more information see this web site:

http://www.regulusastro.com/regulus/papers/grism/

http://www.ee.nmt.edu/~teare/grism.htm

Still another version uses an equilateral prism, also known as a dispersion prism, to break down
the incoming light and spread its spectrum (in a non-linear fashion).  The output can then be
monitored with a linear array sensor or the prism can be mechanically scanned onto a single
photodiode or a couple photodiodes each sensitive to differing parts of the spectrum, visible
or IR.  Unlike a grate the prism doesn’t have higher order spectrum effects.

This can be seen at:

http://lasp.colorado.edu/sorce/sim_instr_design.html

SPECIFICATIONS:

PROJECT STATUS:

INSTRUMENT COSTS:

APPLICABLE WEB SITES:

http://www.oceanoptics.com/Products/hr4000cguvnir.asp

http://www.regulusastro.com/regulus/papers/grism/

http://www.ee.nmt.edu/~teare/grism.htm

http://lasp.colorado.edu/sorce/sim_instr_design.html

DATE: Jly 6, 2006