Image Quality Upgrade Kickoff Meeting

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Image Quality Upgrade Kickoff Meeting

• Daniel OConnor August 6, 2002

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GOAL Make the IRTF a Telescope which is
atmosphere seeing limited
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Part I.

• Improve HVAC System (TB)
• Monitor Dome Environment (DYW)
• Provide Routine Image Quality Assessment (DOC)
• Characterize Static Optics of Telescope (DOC)
• Provide WEB based Documentation (DOC)

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Individual Presentations

• Tim - HVAC
• Darryl Monitoring System
• Miranda Software, WEB
• Dan all else

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HVAC UPGRADE

• GOAL To have an operational HVAC system in
  place, with the capability to set the dome
  thermal environment to a temperature specified by
  the operator. That temperature will be based on
  predictions as to what the outside temperature
  will be during that evenings observing run.

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HVAC History

• Hired consultant to make recommendations.
• Recharged refrigeration circuit.
• Replaced compressor.
• Simplified system circuitry.
• Misc. smaller items.

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HVAC Dome Seals

• Air infiltration is currently overwhelming the
  HVAC system.
• Dome Skirt
• Dome Slit (sides)
• Dome Slit (top)

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HVAC Primary Cooling

• Makes sense to concentrate cooling effort where
  it is required the most.
• May be possible to utilize coude loop hardware in
  primary mirror cooling scheme.

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HVAC Misc. High Priority Items

• Need to specify, order, install, and calibrate
  several temperature sensors, and flow meters.
• Install air bleeds in coude loop.
• Install defrost circuit in coude loop
• Install air separator.

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HVAC Medium Priority Items

• Implement a control system.
• Examine machinery room ventilation.
• Determine exhaust tunnel utilization.
• Install Expansion Tank
• Adjust Dome Louvers

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HVAC Low Priority Items

• Overall System Documentation
• Emergency Shutdown Procedures
• Staff Training

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HVAC Schedule

• Blah, blah

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HVAC Schedule
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Monitoring Dome Environment
The goal is to be able to accurately monitor and
record the temperature and humidity of our
dome/telescope environment
Use existing Johnson Controls temperature and
humidity sensors in dome ceiling
Install new sensors external to dome, on
the telescope, and on primary mirror
Warning pop-up message on operators screen to
notify of potential risk to optics
Archive database and make web accessible
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Sensors
Omega PT100 Sensors
Johnson Controls Sensors
Vaisala Sensors
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Data Monitoring Hardware
LakeShore 218E Monitor
Omega DP472
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Internal DomeSensors
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External Dome Sensors
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Dome and External Sensor Locations
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Telescope/Mirror temperaturesensor locations
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Dew Point Monitoring
Future installment of cooling the primary mirror
will put higher risk of dew and frost forming
Purchase of a Vaisala HMP243 module and mount
near primary
Calculate the dew point using our humidity and
temperature sensors
Warning pop-up message on operators screen to
notify of potential risk to optics
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Data Acquisition Schematic
Telescope Mounted Sensors PT100
LakeShore 218E
Digi Portserver 1
RS232
Network
Dew Pt. Mon
RS232
Mirror Mounted Sensors PT100
LakeShore 218E
Telescope
RS232
J.C. Humidty Sensors
Omega DP472
Vaisala Humidity Temp Sensors
RS232
AC MODEM
MUX
MODEM
RS232
LakeShore 218E
Slip Ring AC Power
J.C. Temp Sensors
AC MODEM
MUX
MODEM
Dome
RS232
Dome Floor Mounted Sensors PT100
LakeShore 218E
RS232
RS232
Digi Portserver 2
Network
Wind Speed/Direction
RS232
Building
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Slip Ring
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Monitoring and Web Software
Miranda Hawarden-Ogata, Albert Fhema

• 24 hour monitoring of all dome and telescope
  sensors, with data to be archived.
• GUI to notify telescope operators and IRTF staff
  of critical environmental changes in the dome.
• Static web pages to display the collected dome
  environment data plots.
• Real-time web pages to display current dome
  environment data.
• Interactive web pages to display selected dome
  environment data.

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Monitoring Overview
Monitor System
Collect Data
Filter Data
Archive Data
Web Display
Display for TOs
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Birds eye view of existing sensors
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All sensors not mounted on the telescope itself
or outside the dome will be displayed on this web
page.
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20.5
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Sensors mounted on telescope and mirror
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All sensors mounted on the telescope itself will
be displayed on this web page. Additional
information will be displayed at the bottom of
the sensor web pages.
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3.) Provide Routine Image Quality Assessment

• GOAL Build an auto-focus system for use with
  NSFCam and SPeX to provide and automated estimate
  of focus for the observer, and provide routine
  assessment of image quality.

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3.) cont. Advantages of Auto-Focus

• Observer spends less time focussing
• Will focus more often (its easier)
• Will provide consistent data on FWHM and Strehl,
  not subjective

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Auto-Focus Schematic
NSFCam
SPeX
HEXAPOD
Take Image
READ FOCUS
WRITE FOCUS
HEXAPOD DAEMON
IDL Fit Routine
Best Fit Focus
FWHM, Strehl, Image, Fit
Storage IQ Archive
GUI
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3.) cont. Focus Update

• After A-F working, develop procedure to do Focus
  Update based on temperature model of telescope
  truss.

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4.) Characterize Optics of Telescope

• Goal Understand factors in the telescope optics
  and mirror support system that limit image quality

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4.) cont. TASKS

• Hire Optical Consultant
• Measure Primary and Secondary Mirrors with
  interferometric technique
• Provide measurement of contribution to error
  budget
• Produce final report

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5.) Provide WEB based Documentation

• Integrated WEB site for IQUP
• Dedicated page for each sub-project

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Schedule / Manpower