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| === RZ, May 30 2012 === | |
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| The figure fwhm_planet would give sources with FWHM ~16 and 20arcsec for the convolution of a 8arcsec disk with 10 and 17arcsec Gaussians correspondingly. I can hardly believe it. To check this I calculated just 2 cases: convolved an 8arcsec disc with 10 and 17arcsec Gaussians. The resulting sources are very well represented by Gaussians with FWHM of 11.12 and 17.7arcsec (no restrictions for the fitting). The difference of the resulting sources and the Gaussian fits are presented below. The discrepancy is -0.4 to +0.14% for the convolution with a 10arcsec and -0.04 to +0.2% for the convolution with a 17arcsec Gaussian. Or do I have a problem in reading the figure fwhm_planet ? | Create one page per subject, but keep all updates and new entries for the same subject in the same page, otherwise discussions are too difficult to follow (e.g. below: subject Gaussian beam and Disk Planet, has 3 entries). |
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| {{attachment:disk8convGauss10-gFit.png}} {{attachment:disk8convGauss17-gFit.png}} |
- [[PlanetConvol |Gaussian beam and Disk Planet: May 29, 2012, NP; May 31, 2012, RZ; June 1st, 2012, NP]] |
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| In preparation for beam studies on Mars, we wanted to estimate the impact of Mars diameter (8 arcsec these days) on the determination of NIKA's FWHM. | - [[ZemaxSimul2012 |Zemax simulations: FOV geometry simulated with grid distortion, effect of focus on PSF: June 04, 2012, SL]] |
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| We convolve a true gaussian by a disk and obtain an effective beam that is no longer gaussian. A gaussian can however be fit (with moderate accuracy) around the peak. Restricting to the region where the effective beam is larger than 0.7 times the maximum, we obtain the following distortion pattern | - (([[attachment:NikaRun4/RZearlyResults.pdf|RZ early results, posted by ?]])). Same thing but with logbook information and a comment to understand the scans, their relations to each other and the context: [[attachment:Mars_beams_central_pix_from_RZearlyResults.pdf|Mars beams on central pixel, effects of atmosphere, focus and tests to investigate the plateau, SL June 13 2012]] using plots from RZ early results (which were not posted by RZ...). Note the focus drift during the plateau tests which we missed and twisted the results of the tests. |
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| {{attachment:fwhm_planet.png ||width=400}} | - Data products: 12 June 2012: on the neel share area: /Archeops/NikaRun4AllData/FitsData you will find the Raw data (Z_ files) and fits files (A_ and B_). Imbfits files are on iram.es computers (to be reprocessed). Pixels directory gives the focal plane geometry reconstruction in fits files (Scan #218 on the 4h is recommended). |
Offline Processing Results
Create one page per subject, but keep all updates and new entries for the same subject in the same page, otherwise discussions are too difficult to follow (e.g. below: subject Gaussian beam and Disk Planet, has 3 entries).
- Gaussian beam and Disk Planet: May 29, 2012, NP; May 31, 2012, RZ; June 1st, 2012, NP
- ((RZ early results, posted by ?)). Same thing but with logbook information and a comment to understand the scans, their relations to each other and the context: Mars beams on central pixel, effects of atmosphere, focus and tests to investigate the plateau, SL June 13 2012 using plots from RZ early results (which were not posted by RZ...). Note the focus drift during the plateau tests which we missed and twisted the results of the tests.
- Data products: 12 June 2012: on the neel share area: /Archeops/NikaRun4AllData/FitsData you will find the Raw data (Z_ files) and fits files (A_ and B_). Imbfits files are on iram.es computers (to be reprocessed). Pixels directory gives the focal plane geometry reconstruction in fits files (Scan #218 on the 4h is recommended).