From Mark.Larsen@sdl.usu.edu Tue Nov 8 14:56:00 2005 Date: Tue, 8 Nov 2005 16:55:50 -0700 From: Mark Larsen To: Peter.Eisenhardt@jpl.nasa.gov, amanda K Mainzer Cc: Valerie G Duval , wright@astro.ucla.edu, Roc Cutri Subject: PRF's I put some PRF's out on docushare in work area > shared > Payload > Point Spread Functions Modeling details · CODE V model to give the diffraction and design residuals · SSG scaled the fabrication errors from another aluminum telescope built recently of comparable size and complexity to the WISE wavefront error budget · Convolved the resulting PSF with the spacecraft, scanner, and detector effects to predict a system level PRF · Grid size is 0.0001 inches, which with the 1.35 meter nominal focal length is 0.388 arcseconds · Remember: this is just meant to be representative. The actual PRF we get will probably have other effects, including astigmatism. · Uses the average scan-modulated distortion (2.3 arcseconds) · More details to follow in a memo, as soon as I can get it reviewed. Regards, -Mark Mark F. Larsen, Ph.D. USU Space Dynamics Laboratory 1695 North Research Parkway North Logan, UT 84341 (435)797-4337 Mark.larsen@sdl.usu.edu