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Image inversion analysis of the hst ota (hubble space telescope optical telescope assembly), phase a
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Litvak, M. M. |
| Copyright Year | 1991 |
| Description | Technical work during September-December 1990 consisted of: (1) analyzing HST point source images obtained from JPL; (2) retrieving phase information from the images by a direct (noniterative) technique; and (3) characterizing the wavefront aberration due to the errors in the Hubble Space Telescope (HST) mirrors, in a preliminary manner. This work was in support of JPL design of compensating optics for the next generation wide-field planetary camera on HST. This digital technique for phase retrieval from pairs of defocused images, is based on the energy transport equation between these image planes. In addition, an end-to-end wave optics routine, based on the JPL Code 5 prescription of the unaberrated HST and WFPC, was derived for output of the reference phase front when mirror error is absent. Also, the Roddier routine unwrapped the retrieved phase by inserting the required jumps of +/- 2(pi) radians for the sake of smoothness. A least-squares fitting routine, insensitive to phase unwrapping, but nonlinear, was used to obtain estimates of the Zernike polynomial coefficients that describe the aberration. The phase results were close to, but higher than, the expected error in conic constant of the primary mirror suggested by the fossil evidence. The analysis of aberration contributed by the camera itself could be responsible for the small discrepancy, but was not verified by analysis. |
| File Size | 1633915 |
| Page Count | 35 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920020116 |
| Archival Resource Key | ark:/13960/t84j5dh3s |
| Language | English |
| Publisher Date | 1991-07-18 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Errors Point Sources Image Analysis Digital Techniques Inversions Hubble Space Telescope Cameras Nonlinearity Mathematical Models Aberration Mirrors Wave Fronts Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
