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cso:instruments:fts:fts-holo [2011-03-08 20:25] sradford |
cso:instruments:fts:fts-holo [2011-03-25 14:18] (current) sradford |
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+ | ====== FTS Holography ====== | ||
+ | |||
+ | <file> | ||
+ | |||
+ | RAC, 16-May-2001 | ||
+ | |||
+ | |||
+ | 1. Log into alpha1. | ||
+ | SET DEF [FTS.ALPHA] | ||
+ | RUN FTSRUN | ||
+ | FTSRUN> wlf ( you should see a clean white light fringe) | ||
+ | |||
+ | 2. On alpha1, open a new window | ||
+ | UIP | ||
+ | UIP> POINT FTS_HOLO (load the FTS pointing file) | ||
+ | UIP> PLANET MARS | ||
+ | |||
+ | 3. Back in FTSRUN | ||
+ | FTSRUN> HCM ( holography, complete map) | ||
+ | accept all the parameter defaults for stage travel, speed, filter, etc. | ||
+ | do a 15x15 map | ||
+ | name the data file yymmddxx.dat where yy is the year, mm the month | ||
+ | dd the day and xx =01 for the first map, 02 for the second, etc. | ||
+ | eg. 01051701.DAT | ||
+ | |||
+ | 4. When map is done, start a new one with a new file name. | ||
+ | |||
+ | 5. Reduce the map you just made. | ||
+ | a. log onto Poliahu | ||
+ | b. SET DEF [FTS.ALPHA] | ||
+ | c. RUN [SERABYN.FTS]FTSANA | ||
+ | FTSANA> M | ||
+ | enter the file name you just made, eg 01051701.DAT | ||
+ | FTSANA does some processing and then asks | ||
+ | if you want the processing to be automatic. Yes you do. | ||
+ | d. After FTSANA is done a processed file is written to | ||
+ | [SERABYN.HOLO] with a .SKY extension | ||
+ | e. To see the map in a new window on Poliahu: | ||
+ | SET DEF [SERABYN.HOLO] | ||
+ | RUN MAP | ||
+ | MAP> INP (input file name) | ||
+ | 01051701.SKY | ||
+ | select a frequency range. The peak response | ||
+ | of the instrument is around 450GHz if you are | ||
+ | using the 560LP filter on the bolometer and the 20" cone in | ||
+ | bolometer. However, if the sky is bad, try around 350GHz | ||
+ | and you might get better s/n. | ||
+ | |||
+ | MAP> CEN (fit out pointing offset) | ||
+ | MAP> INP (reload input file) | ||
+ | MAP> SHI (based on result from CEN) | ||
+ | MAP> FIT (fit out 2nd parameters) | ||
+ | | ||
+ | MAP> PLO (plot out the phase and power on the sky) | ||
+ | MAP> FOUR (fourier transform to the aperture plane) | ||
+ | MAP> FIT (fit out gradients due to pointing; | ||
+ | and subreflector x, y, focus) | ||
+ | MAP> PLO (plot out the phase and power in the aperture plane) | ||
+ | | ||
+ | </file> | ||