Appeal 2007-1843
Application 10/174,640
said tunable visible input is provide at a second visible frequency
that is tunable so that the difference-frequency between said first visible
frequency and said second visible frequency is at an infrared frequency; and
said fixed visible input and said tunable visible input are alignable
so that their surface locations of optical illumination overlap on said
interrogated location generating said difference-frequency from said surface
overlap location;
c) an output wavelength discriminator for receiving said reflected
infrared difference-frequency generated on said interrogated location, said
output wavelength discriminator being substantially non-transmissive at
frequencies higher than said difference-frequency, but being substantially
transmissive at said difference-frequency of said fixed visible input and said
tunable visible input, the output of said output wavelength discriminator
being an infrared output;
d) signal collection optics for receiving said output of said output
wavelength discriminator and directing the propagation of said output of the
output wavelength discriminator so that a collected optical light signal is
formed after propagation through said signal collection optics; and
e) an optical detector for converting said collected optical light signal
to an electronic signal, thus monitoring the intensity of said infrared
difference-frequency as a function of the interrogated surface contamination
and observing a material resonance for providing surface-sensitive infrared
spectroscopic characterizations on the surface to be interrogated.
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Last modified: September 9, 2013