Temperature characterisation -Experimental protocole

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					      Temperature characterization -Experimental
                     protocole

- Default
characterization:0.25%/
°C

- Temperature ramp
between +50 -30°C in an
oven temperature, step 5
mn/°C (take about 5
hours)

- Sphere stability 0.1 %

- Special eprom
developped by Cimel Sky
in all channels
   Typical behavior in Temp.for 1020 nm Si


                  1 order

                            2nd order




Aeronet program create some files with coefficients from file
.k7
Strange detector behavior?




    After change detector
Some results #398 –Utsteinen Antartica, feb 16,2009




                                 2 nd order correction




                     0.25% /°C




                         10°C


     Same bumps and troughs
    #408 – South Pole on Jan 01, 2011
Old correction                   New correction




                       - Correction for all channels, except
                       380 and 340 nm, involve all channels
                 3°C   in good filters order except UV filters…
                    conclusion
• The temperature characterization is important to
  improve AOD precision
• Important for the Masters instruments and cold sites
  (low AOT)
• Characterization needed at least for every change of
  1020 nm, 870 nm filters and detector ( not possible for
  now in the filter database)
• Characterization important for all channels specially for
  the cold sites (Antartica)

				
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posted:4/3/2013
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