1	Infrared Spectrometry and Radiometry (and the Cassini Composite Infrared spectrometer) Adam Ginsburg September 25, 2007
2	Infrared: What wavelengths?
3	What can you see? Thermal Infrared
4	Infrared Spectra Emission and absorption lines and bands
5	Dealing with Infrared Longer wavelengths Atmospheric emission Instrument emission
6	Dealing with Infrared Longer wavelengths Lower resolution for a given aperture Atmospheric emission Instrument emission
7	Dealing with Infrared Longer wavelengths Lower resolution for a given aperture Atmospheric emission Difficult or impossible from Earth Instrument emission
8	Dealing with Infrared Instrument emission Must cool the whole box
9	Infrared Detectors HgCdTe (Mercury Cadmium Telluride)
10	Bolometers Absorb photons, thermometers measure temperature
11	Thermopiles
12	Heterodyne Detectors
13	Types of Spectrographs Grating spectrographs (Ben covered these) Fourier Transform spectrographs Michelson Interferometer Fabry-Perot Interferometer / Etalon Heterodyne Detectors
14	Michelson Interferometer Broad spectral range
15	Fabry-Perot Etalon Very high resolving power ~30000 Most useful for narrow-band spectroscopy
16	Cassini CIRS
17	The Instrument
18	CIRS Specs
19	Field of View
20	Science
21	Science Results: Titan
22	Science Results: Enceladus Warm emissions around ice cracks
23	Science Results: Jupiter
24	Compare to VIMS
25	References http://cirs.gsfc.nasa.gov/ http://saturn.jpl.nasa.gov/spacecraft/inst-cassini-cirs-details.cfm http://www.iop.org/EJ/abstract/0143-0807/27/5/010 - Fabry Perot interferometers described http://cdsads.u-strasbg.fr/cgi-bin/nph-iarticle_query?1995ESASP.374..385M&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf http://cdsads.u-strasbg.fr/abs/1995ESASP.374..385M http://www.boulder.swri.edu/recent/enceladus_geological_activity/ http://irtfweb.ifa.hawaii.edu/research/science/03.Orton.Cassini_CIRS.html (Cassini Jupiter Temperature Mapping) http://www.obspm.fr/actual/nouvelle/sep04/jupiter.en.shtml (Jupiter CO/HCN vs latitude) http://cassini-huygens.jpl.nasa.gov/cgibin/gs2.cgi?path=../multimedia/images/jupiter-flyby/images/cirs010123b.jpg&type=image (field of view for Jupiter flyby) http://cassini-huygens.jpl.nasa.gov/cgibin/gs2.cgi?path=../multimedia/images/jupiter-flyby/images/cirs010123a.jpg&type=image (spectrum from jupiter flyby) http://www.astro.umd.edu/~nixon/research.html (Titan spectrum) http://www.astro.umd.edu/~nixon/mission.html (Titan pointings, Cassini must be pointed as a whole) http://www.californiasciencecenter.org/Exhibits/AirAndSpace/MissionToThePlanets/Cassini/CassiniUpdates/Archive/Cscience.php (saturn temperature mapping) http://adsabs.harvard.edu/abs/2004SSRv..115..169F http://en.wikipedia.org/wiki/Michelson_interferometer