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1201_Operators_Guide.doc
Version: 2014-12-03
13. Focus Adjustment Graphs
The tcs calculates a focus adjustment value based on change of temperature and position. The is done in the
TCS focus loop with run at 10Hz. The adjustment formulas used are from the following documents:
IRTF Focus vs. Temperature, Michael Connelley, Apr 8 2011
http://iborg.ifa.hawaii.edu:8080/Plone/irtf-projects/image-quality/Focus_temp.pdf/view
Mapping IRTF's Focus Shift vs. Pointing, Micheal Connelley, Apr 19 2011
http://iborg.ifa.hawaii.edu:8080/Plone/irtf-projects/image-quality/Focus_Pointing_Mapping.pdf/view
Here are graphs showing the focus changes based on temperature and position. This data was taken using the
IRTF Chopping Secondary, thus the focus units are the LVDT voltages.
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