Tech Meet 2

Main Wiki

Restricted Wiki

Local resources

PmWiki

pmwiki.org

edit SideBar

Tech Meet 2

Technical Meeting #2: Optomechnical design and derived requirements

This meeting took place on Friday 7 May at 14:00. Attendees: JSY, CAH, DFB, XS, EBS, ADR, DMAW

Agenda

  • Discussion of any results from high priority tasks
    • DFB & JSY: Assign working value for overall image quality requirement
    • DFB: Assign range for pixel scale
    • ADR & CAH: Think about how to apportion image quality budget
    • ADR & CAH: Nominal stability budget
    • XS: Understand space envelope, optical components & make CAD drawing
    • XS: Initial studies of achievable stability
    • MF: Thermal analysis of camera in box
  • Next steps
    • Tasks
    • Next meeting(s)

Discussion Slides

Optical Tolerancing Slides as PDF

Task Assignments

Completed tasks

  • DFB & JSY: Assign working value for overall image quality requirement
    • Working value is ~1 pixel independent of pixel scale (avoids aliasing of high frequencies in speckled image)
  • DFB: Assign range for pixel scale
    • Working range is 0.12 to 0.2 arcsec/pixel
      • Fine limit of 0.12 arcsec/pix set by acquisition mode FOV (assuming same pixel scale for acquisition and FTT modes)
      • Coarse limit of 0.2 arcsec/pix corresponds to 2.5 pixels across FWHM of short-exposure seeing-limited image
  • ADR & CAH: Optical image quality tolerancing of OAP-based layout
    • See attached slides. Converting this into a budget by component has been deferred
  • ADR & CAH: Stability tolerancing of OAP-based layout
    • See attached slides. Converting this into a budget by component has been deferred
  • EBS: Chase Princeton for mechanical drawings of camera
    • We (all?) need to sign NDA
  • XS: Understand space envelope, optical components & make CAD drawing
  • JSY: Make corrections to appendix of FTT technical requirements document

High priority tasks

  • ADR & CAH: Layout and tolerancing of lens-based optical system
  • XS: Initial studies of achievable stability
  • MF: Thermal analysis of camera in box
  • JSY: Correct target object spectral energy distribution for limiting magnitude in FTT technical requirements document
  • EBS: Draw up EMCCD camera comparison matrix

Lower priority tasks

  • ADR: Dialogue with OAP manufacturer re referencing to optic axis of finished component
  • ADR: Optical design using off-the-shelf components
  • ADR & CAH: Use tolerancing results to assign image quality and stability budgets by component
  • EBS: Liase with ADR about possible sources for off-axis paraboloids
  • JSY: Photon rate calculations
  • DMAW & MF: Start thinking about test arrangements

Next Meetings

Initial follow-up discussion of results from the high-priority tasks will be done informally (for example at coffee times). A first meeting to discuss the FTT software requirements and conceptual design will take place at 14:00-16:30 on Friday 14 May in the Ryle Seminar Room.

Recent Changes (All) | Edit SideBar Page last modified on May 10, 2010, at 10:17 AM Edit Page | Page History
Powered by PmWiki