An algorithm for rapid measurement of aberrations in pairs of out-of-focus images
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2012.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2013
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| Online Access: | http://hdl.handle.net/1721.1/78543 |
| _version_ | 1826209565127999488 |
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| author | Janish, Ryan J. (Ryan Joseph) |
| author2 | Paul L. Schechter. |
| author_facet | Paul L. Schechter. Janish, Ryan J. (Ryan Joseph) |
| author_sort | Janish, Ryan J. (Ryan Joseph) |
| collection | MIT |
| description | Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2012. |
| first_indexed | 2024-09-23T14:24:27Z |
| format | Thesis |
| id | mit-1721.1/78543 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T14:24:27Z |
| publishDate | 2013 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/785432019-04-10T17:32:36Z An algorithm for rapid measurement of aberrations in pairs of out-of-focus images Janish, Ryan J. (Ryan Joseph) Paul L. Schechter. Massachusetts Institute of Technology. Department of Physics. Massachusetts Institute of Technology. Department of Physics. Physics. Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2012. Cataloged from PDF version of thesis. Includes bibliographical references (p. 57). In this thesis, I present a new technique for measuring the optical aberrations produced by a telescope, with an eye towards future use of these aberration measurements to align wide-field telescopes. This method determines the aberrations by simultaneously fitting a pair of oppositely defocused images to a mostly analytic model. I develop the model and describe its software implementation in detail, and then report on the results of tests with simulated and real data. This technique is able to extract the aberrations from simulated data rapidly and accurately, and it has been used with mixed success to analyze data from the VISTA telescope. With the VISTA data, the algorithm is unable to match small-scale brightness variations in the images. However, it was able to determine aberrations with median accuracies of 0.08 um for coma, 0.08 um for astigmatism, 0.9 um for tilt, and 0.3 um for defocus. It was also quite fast, with an average of 34 iterations until convergence. by Ryan J. Janish. S.B. 2013-04-12T19:37:48Z 2013-04-12T19:37:48Z 2012 2012 Thesis http://hdl.handle.net/1721.1/78543 836817391 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 57 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Physics. Janish, Ryan J. (Ryan Joseph) An algorithm for rapid measurement of aberrations in pairs of out-of-focus images |
| title | An algorithm for rapid measurement of aberrations in pairs of out-of-focus images |
| title_full | An algorithm for rapid measurement of aberrations in pairs of out-of-focus images |
| title_fullStr | An algorithm for rapid measurement of aberrations in pairs of out-of-focus images |
| title_full_unstemmed | An algorithm for rapid measurement of aberrations in pairs of out-of-focus images |
| title_short | An algorithm for rapid measurement of aberrations in pairs of out-of-focus images |
| title_sort | algorithm for rapid measurement of aberrations in pairs of out of focus images |
| topic | Physics. |
| url | http://hdl.handle.net/1721.1/78543 |
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