README file for EDDIES cruise oc415-4 Chelsea Fluorometer Calibration
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A Chelsea Fluorometer (S/N ???) was installed on the sampling sled for 
this cruise. For the first sampling tow the Wetlabs fluorometer from 
the Oceanus CTD was also put on the sampling sled for inter-calibration 
between the two sensors.

Data from the doencast portion of the tow were used to determine the 
relationship between the two sensors. Figure (1) (aka Ch_W_cal.png)
shows the relationship between the Chelsea (in 10^volts) and Wetlabs 
(in micrograms/liter) fluorometers and the resulting curve fit.
The coefficients of the quadratic polynomial are: [.1273 -.3648 .3207]

These polynomial coefficients were used to convert the 'flight' portion of 
the first sampling tow data from the Chelsea to micrograms/liter. The results
are shown in Figure (2) (aka Ch_W_cmp.png), It can be seen that the Chelsea
seems to be slightly higher than the Wetlabs. This difference is due to an
as yet unresolved problem with the calibration process described above.

C Sellers 7 Sept 05