Design of the infrared fast steering mirror chopping control system for the Keck II Telescope

Details Design of the infrared fast steering mirror chopping control system for the Keck II Telescope Design of the infrared fast steering mirror chopping control system for the Keck II Telescope

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3352..687a&link_type=abstract

Proc. SPIE Vol. 3352, p. 687-698, Advanced Technology Optical/IR Telescopes VI, Larry M. Stepp; Ed.

Computer Science

Performance

Scientific paper

The Keck 2 ten meter telescope will utilize an advanced chopping secondary mirror in order to enhance observations in the infrared. The Infrared Fast Steering Mirror (IFSM) can execute a square-wave chop at frequencies as high as 25 Hz with an accuracy of +/- 0.1 arcsec. Chopping can be synchronized by focal plane instruments, and the system can simultaneously perform high-performance chopping as well as beam-steering (for atmospheric correction), providing the Keck telescope with greatly enhanced capability. Details of design, testing, and performance of the Keck 2 IFSM are presented in this paper. The mirror is controlled by three voice coil actuators. Reaction forces generated by the actuators are absorbed by a reaction mass suspended from the main IFSM structure. Motor driven springs are used to minimize power dissipation in the actuators. The IFSM all- digital control system uses a unique adaptive algorithm that forces the mirror to precisely follow the commanded chop waveform. Tests use various computerized instruments: a three-axis laser interferometer for calibration and stability, a 6-axis dynamometer to evaluate reaction forces transmitted to the telescope. In addition to specifics of the design, performance, and testing, a video illustrating details of the IFSM hardware and showing it in operation will be presented.

Affiliated with

Also associated with

No associations

Rating

Design of the infrared fast steering mirror chopping control system for the Keck II Telescope does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Design of the infrared fast steering mirror chopping control system for the Keck II Telescope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Design of the infrared fast steering mirror chopping control system for the Keck II Telescope will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1538906