PARTICLE PHYSICS AND ASTRONOMY RESEARCH COUNCIL MTPPN /003.1
JOINT ASTRONOMY CENTRE

James Clerk Maxwell Telescope

JCMT Pointing Project Note 003.1

Inclinometry : The Past and Future

• Contents
• Introduction
• The need for a model of the JCMT antenna track
  • The ideal telescope
  • The real telescope : A-frames, SERVO, lumps and bumps
• Geometrical and Structural Assumptions
  • Application within the TEL task
  • Rigidity
  • The redundancy in current measurements
  • Hysteresis ?
  • Track Parameters
• Data acquisition - the old system
  • The inclinometers
  • Where to put them, how, and why.
    • On the A-frames
    • On the tertiary mirror platform in the receiver cabin
  • Configuration for Calibration
  • Cabling
  • Running up the Software
  • Data-taking strategy
• Data storage and analysis
• Performance of and problems with the current system
• Proposed upgrade to the system
• Current status
• About this document ...