SEMS Initial Design Review

Discipline: 
Engineering

Friday, March 6 10am-11am

Attendees

  • Ben Burleson
  • John Martinez
  • Mike Falarski
  • Wayne Rosing
  • Jon De Vera
  • Martin Norbury
  • Andrew Pickles

Agenda

  1. Review project goals and deliverables
  2. Review current state
  3. Assess questions and unknowns
  4. Determine timeline

Results

  1. Review Project Goals and Deliverables

    • System is part of the core site node, one of the most basic site elements
    • Site is in charge of enclosures - one decision maker for all
    • Different thresholds for different telescopes on site. Need to be aware of all telescopes on site.
    • Critical Criteria
      • Wind above threshold (gust or sustained)
      • Rain/Precipitation/Wetness
      • Dew Point within threshold of Temperature
      • Electric field detects lightning near
      • Particulate above threshold (dust storm)
      • Cloud threshold
    • CampbellSci unit programmed to provide "Enclosure Close" command in critical situations - This needs investigation
    • Log data to database
    • Log desicions to database
    • Provide publish/subscribe functionality to alert when data changes or crosses threshold, etc.
    • Provide simple interface for any interested software to access current or past data.

  2. Review Current State

    [insert diagram]

  3. Assess Questions and Unknowns

    • What data is needed?
      • See critical criteria above.
    • At what rate?
      • Max: 4x/minute or every 15 sec
    • What is the data lifetime?

      Few days on site.

      Data is then replicated at SBA. Process at SBA will filter older data into more coarse time samples. Data will live indefinitely at coarse granularity.

    • What comes in to this system, what goes out?

      In

      • Internal instrument readings
      • External site feeds
        • If we want to use external data to make any decisions, we must log it
        • Alert if external disagrees with our internal readings
      • Science feedback
        • Quicklook
        • All-sky cam

      Out

      • Heartbeat to those interested
      • Enclosure Open/Close Signal - variable per telescope/enclosure
      • Current Status
        • All data we know about
        • Published and on request
      • Data History
        • Query-able for science reference
        • Publish trends
    • Push vs. Poll
    • What is on site, what is off site?
    • What computers are needed?

  4. Determine Timeline

    Needed by science deployment of Sedgewick (June 2009), but hopefully before then to aid in site testing (April 2009).

Action Items

  • Investigate possibility of CR1000 asserting "Enclosure Close" output on critical criteria.
Tags: 
sems
design review