Adaptive DFT-Based Interferometer Fringe Tracking
<p/> <p>An automatic interferometer fringe tracking system has been developed, implemented, and tested at the Infrared Optical Telescope Array (IOTA) Observatory at Mount Hopkins, Arizona. The system can minimize the optical path differences (OPDs) for all three baselines of the Michelso...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2005-01-01
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| Series: | EURASIP Journal on Advances in Signal Processing |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1155/ASP.2005.2559 |
| _version_ | 1818412595548258304 |
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| author | Pedretti Ettore Traub Wesley A Bregman Jesse Mah Robert W Wilson Edward |
| author_facet | Pedretti Ettore Traub Wesley A Bregman Jesse Mah Robert W Wilson Edward |
| author_sort | Pedretti Ettore |
| collection | DOAJ |
| description | <p/> <p>An automatic interferometer fringe tracking system has been developed, implemented, and tested at the Infrared Optical Telescope Array (IOTA) Observatory at Mount Hopkins, Arizona. The system can minimize the optical path differences (OPDs) for all three baselines of the Michelson stellar interferometer at IOTA. Based on sliding window discrete Fourier-transform (DFT) calculations that were optimized for computational efficiency and robustness to atmospheric disturbances, the algorithm has also been tested extensively on offline data. Implemented in ANSI C on the 266 MHz PowerPC processor running the VxWorks real-time operating system, the algorithm runs in approximately <inline-formula><graphic file="1687-6180-2005-531501-i1.gif"/></inline-formula> milliseconds per scan (including all three interferograms), using the science camera and piezo scanners to measure and correct the OPDs. The adaptive DFT-based tracking algorithm should be applicable to other systems where there is a need to detect or track a signal with an approximately constant-frequency carrier pulse. One example of such an application might be to the field of thin-film measurement by ellipsometry, using a broadband light source and a Fourier-transform spectrometer to detect the resulting fringe patterns.</p> |
| first_indexed | 2024-12-14T10:49:48Z |
| format | Article |
| id | doaj.art-c2f8790835134882876a7ee1bd966022 |
| institution | Directory Open Access Journal |
| issn | 1687-6172 1687-6180 |
| language | English |
| last_indexed | 2024-12-14T10:49:48Z |
| publishDate | 2005-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | EURASIP Journal on Advances in Signal Processing |
| spelling | doaj.art-c2f8790835134882876a7ee1bd9660222022-12-21T23:05:16ZengSpringerOpenEURASIP Journal on Advances in Signal Processing1687-61721687-61802005-01-01200515531501Adaptive DFT-Based Interferometer Fringe TrackingPedretti EttoreTraub Wesley ABregman JesseMah Robert WWilson Edward<p/> <p>An automatic interferometer fringe tracking system has been developed, implemented, and tested at the Infrared Optical Telescope Array (IOTA) Observatory at Mount Hopkins, Arizona. The system can minimize the optical path differences (OPDs) for all three baselines of the Michelson stellar interferometer at IOTA. Based on sliding window discrete Fourier-transform (DFT) calculations that were optimized for computational efficiency and robustness to atmospheric disturbances, the algorithm has also been tested extensively on offline data. Implemented in ANSI C on the 266 MHz PowerPC processor running the VxWorks real-time operating system, the algorithm runs in approximately <inline-formula><graphic file="1687-6180-2005-531501-i1.gif"/></inline-formula> milliseconds per scan (including all three interferograms), using the science camera and piezo scanners to measure and correct the OPDs. The adaptive DFT-based tracking algorithm should be applicable to other systems where there is a need to detect or track a signal with an approximately constant-frequency carrier pulse. One example of such an application might be to the field of thin-film measurement by ellipsometry, using a broadband light source and a Fourier-transform spectrometer to detect the resulting fringe patterns.</p>http://dx.doi.org/10.1155/ASP.2005.2559fringe trackingDFTinterferometryIOTAreal time |
| spellingShingle | Pedretti Ettore Traub Wesley A Bregman Jesse Mah Robert W Wilson Edward Adaptive DFT-Based Interferometer Fringe Tracking EURASIP Journal on Advances in Signal Processing fringe tracking DFT interferometry IOTA real time |
| title | Adaptive DFT-Based Interferometer Fringe Tracking |
| title_full | Adaptive DFT-Based Interferometer Fringe Tracking |
| title_fullStr | Adaptive DFT-Based Interferometer Fringe Tracking |
| title_full_unstemmed | Adaptive DFT-Based Interferometer Fringe Tracking |
| title_short | Adaptive DFT-Based Interferometer Fringe Tracking |
| title_sort | adaptive dft based interferometer fringe tracking |
| topic | fringe tracking DFT interferometry IOTA real time |
| url | http://dx.doi.org/10.1155/ASP.2005.2559 |
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