| A CSO SUBMILLIMETER ACTIVE OPTICS SYSTEM |
| Dish Surface Optimization System | |
| URSI 2005 Jan. 6, 2005 | |
| Melanie Leong |
| DSOS Agenda |
| Preliminary Specifications | |
| 99 Channel Dish Surface Optimization System | |
| Engineering Challenges / Major Milestones | |
| Performance | |
| Summary | |
| Acknowledgements |
| DSOS Preliminary Specifications |
| Desired Performance Specifications | ||
| +/- 25 micron length change for most of the dish | ||
| Reduce RMS surface error from 25 micron RMS to 15 micron RMS | ||
| Improve aperture efficiency by a factor of 2, integration time by a factor of 4 | ||
| Single Channel Prototype | ||
| Determined +/- 25 micron feasibility | ||
| Determined design, parts, and materials | ||
| 3 Toothpick Controller/Driver Prototype demonstrated that desired length changes can be achieved | ||
| 99 Channel Dish Surface Optimization System requested to build in January 2001 | ||
| DSOS System Diagram |
| DSOS Simplified Block Diagram |
| DSOS Toothpick Assembly |
| DSOS Dish Wiring & Plumbing |
| DSOS System Racks |
| DSOS 99 Channel Controller Unit |
| DSOS 99 Channel Controller Unit (cont.) |
| DSOS 25 Channel Driver Unit |
| DSOS 25 Channel Driver Unit (cont.) |
| DSOS Length Change Capability |
| DSOS Performance |
| The +/- 25 micron desired capability has been achieved | ||
| Power Consumption | ||
| Power Draw At Start Up = 4kWatts | ||
| Quiescent Power Draw = 840 Watts | ||
| Added Weight to Dish - 268 lbs | ||
| Approximate Weight of System on 3rd Floor - 1,994 lbs | ||
| DSOS Performance - Feb. 2003 |
| DSOS SHARCII - April 2003 |
| DSOS - Holography Sept 2002 vs Aug 2003 |
| DSOS Holography - April 2004 |
| DSOS SHARCII - April 2004 |
| DSOS Summary |
| The DSOS consistently improves the aperture efficiency of the 10.4-meter Leighton Telescope in the 350 micron wavelength range | |
| New detections of weak and/or distant objects with SHARCII and 850 GHz Receiver have been obtained with the help of the DSOS | |
| It is a unique active optics system for a unique telescope | |
| The DSOS has been in operation since Feb. 2003 | |