Large Binocular Telescope TCS Overview In Tucson 09
Large Binocular Telescope: TCS Overview In Tucson 09 November 2010 Presented by: John M. Hill LBT Technical Director
Outline of the talk Observatory / Telescope Control System l Binocular Pointing Control System l Point Spread Function & Collimation l Adaptive Optics On-Sky l First Fringes with LBTI l
Telescope Control System (Observatory Control System) High Level Sub-systems on Linux servers in Control Room l Gigabit ethernet communications l Graphical User Interface l Other distributed computers for hardware interface: PLC or Vx. Works l Real-time digital servos for Mount Control System l
Monocular TCS Sub-Systems (just like regular telescopes) l Mount Control System (MCS) – Tracks mount in altitude/azimuth l Pointing Control System (PCS)* – Generates tracking polynomials Enclosure Control System (ECS) l Telemetry Sub-System (TEL) l Instrument Interface (IIF) l
Binocular TCS Sub-Systems (deployed in pairs) l Guiding Control System (GCS) – Off-axis Guiding l Point Spread Function (PSF) – Active Optics and Collimation Primary Mirror Cell (PMC) l Optical Support Structure (OSS)* l Adaptive Optics System (AOS) l – Fast Wavefront Correction
Telescope Operator’s Console
Telescope Control System Basic TCS software sub-systems are complete including monocular PCS. l Binocular Pointing Control System (PCS) is under development and testing. l Adaptive Optics System (AOS) is being tested on-sky. l Telemetry operational for 70% of TCS l
Binocular Presets Normally not a single side=BOTH preset l Synchronized side presets l – Binocular Control (a pair of presets is coming) – Side=LEFT preset – Side=RIGHT preset l Asynchronous presets – Resend a failed sided preset – New sided preset in the same target field l Offsets work in the same fashion – See 481 s 620 by D. Thompson
Binocular PCS Pointing Flow Calculate Mount & Rotator Positions for Left Telescope Calculate Mount & Rotator Positions for Right Telescope Combine Left & Right Mount Positions to Get a Compromise Mount Position Calculate Optics Tip/Tilt Positions for Right Telescope Calculate Optics Tip/Tilt Positions for Left Telescope Redistribute the Tip/Tilt between the two sides to optimize image quality After Figure 1 of Terrett 481 x 120
LBT Active Optics - PSF Point spread function control (left/right) GUI PCS IIF GCS AOS RPC Elevation angle Zernike definitions PSF Subsystem Mirror bending modes Temperature Collimation tables
Active Optics
Temperature Table Active Optics
Elevation Table Temperature Table Active Optics
DX M 1 Collimation vs Elevation for RFBG
Elevation Table Temperature Table Active Optics Instrument Offsets
Elevation Table Temperature Table Active Optics Instrument Offsets Pointing Offsets
Elevation Table Temperature Table Active Optics Instrument Offsets Pointing Offsets Fixed User Offsets
Total Collimation Elevation Table Temperature Table Active Optics Instrument Offsets Pointing Offsets Fixed User Offsets
LBT Active Optics - PMC Primary mirror cell control (left/right) GUI PSF subsystem RPC PMC subsystem On Telescope Ethernet Vx. Works computer Serial Actuators Hard points Slide courtesy of C. Biddick
Seeing Limited Image of Binary Star
Adaptive Loop Closed 27 -May-2010 1000 Hz 400 modes linear stretch
Adaptive Loop Closed 27 -May-2010 1000 Hz 400 modes log stretch
Beam Combination at Bent Gregorian Focus
LBTI October 2010
First Fringes with LBTI October 2010
10. 55 microns 9. 2% filter 0. 034 arcsec/pix 98 millisec
Questions ?
- Slides: 29