Replies to post #12543 on Cdex, Inc. (fka CDEX)

[d4diddy]

You're right Crow with both examples except for one minor detail. Substitue the word "absorption" for "interference" and I'll be happy! LOL

"The sample is in a cuvette..your excite it with UV..shine the UV through the sample onto a detector..the detector samples the interference bands, passes the info on to the electronics..then to the read out. Requires a liquid sample, since solids are UV opaque."

The above is UV absorption spectroscopy. The detector measures the intensity of the UV after it has passed thru the sample and compares it with the original intensity. The data displayed is %absorption vs. wavelength (the intensity is normalized). The absorption "peaks" on the graph are inverted representing a decrease in the transmitted intensity.