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| === RZ, May 30 2012 === | |
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| The figure fwhm_planet gives FWHM ~16 and 20arcsec for an 8arcsec disk convolved with 10 and 17arcsec Gaussians correspondingly. I can hardly believe it ! To check this I calculated just the 2 cases, i.e. convolved an 8arcsec disc with 10 and 17arcsec Gaussians. The resulting sources are very well represented by Gaussians with FWHM of 11.1 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 on page per subject, but keep all update and new entry 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]] |
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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 on page per subject, but keep all update and new entry 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
- 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).