go to the Remote Sensing Analyzers product page Dian Fenley asked on Feb 17th, 2014 in Remote Sensing Analyzers

How does molecular spectroscopy works ?

Jill McGee

ABB's answer

One way to cause the frequency of a molecular vibration to increase is to excite the bond by having it absorbs light energy:  this is the technique we use in our Analytical products, by using an active light source.  Space-based instruments, however, are remote sensing systems, and most of the times passively measure the gases, without any active source of light, by looking at its self-emission or by using the background emitted radiance.  This technique is more difficult since the level of molecular excitation is much lower than using an active source of light.  The remote sensing technique is needed in space since the satellites do not fly within the atmosphere, but at several kilometers away from the atmosphere (up to 36,000 kilometers on geostationary orbit !)

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