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Image Quality Upgrade Kickoff Meeting Daniel O’Connor August 6, 2002
Image Quality Upgrade Kickoff Meeting
Daniel O’Connor August 6, 2002
GOAL: Make the IRTF a Telescope which is
atmosphere seeing limited
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)
Individual Presentations
Tim - HVAC Darryl – Monitoring System Miranda – Software, WEB Dan – all else
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.
HVAC : History
Hired consultant to make recommendations.
Recharged refrigeration circuit. Replaced compressor. Simplified system circuitry. Misc. smaller items.
HVAC : Dome Seals
Air infiltration is currently overwhelming the HVAC system.
Dome Skirt Dome Slit (sides) Dome Slit (top)
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.
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.
HVAC : Medium Priority Items
Implement a control system. Examine machinery room ventilation. Determine exhaust tunnel utilization. Install Expansion Tank Adjust Dome Louvers
HVAC : Low Priority Items
Overall System Documentation Emergency Shutdown Procedures Staff Training
HVAC : Schedule
Blah, blah
HVAC : Schedule
Monitoring Dome EnvironmentThe goal is to be able to accurately monitorand record the temperature and humidity ofour dome/telescope environment
Use existing Johnson Controls temperature and humidity sensors in dome ceiling
Install new sensors external to dome, on thetelescope, and on primary mirror
Warning ‘pop-up’ message on operators screento notify of potential risk to optics
Archive database and make web accessible
SensorsOmega PT100 SensorsJohnson Controls Sensors
Vaisala Sensors
LakeShore 218E Monitor
Omega DP472
Data Monitoring Hardware
Internal Dome
Sensors
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33’
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45.5’
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2’2’
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External Dome Sensors
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Dome and External Sensor Locations
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Telescope/Mirror temperature
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Dew Point Monitoring
Future installment of coolingthe primary mirror will put higherrisk of dew and frost forming
Purchase of a Vaisala HMP243module and mount near primary
Calculate the dew point using our humidityand temperature sensors
Warning ‘pop-up’ message on operators screento notify of potential risk to optics
Data Acquisition Schematic
LakeShore218E
LakeShore218E
LakeShore218E
LakeShore218E
OmegaDP472
DigiPortserver
#1
MUX
Wind Speed/Direction
VaisalaHumidityTemp Sensors
J.C. HumidtySensors
TelescopeMounted Sensors PT100
Mirror MountedSensors PT100
J.C. TempSensors
Dome FloorMountedSensors PT100
RS232
RS232
RS232
RS232
Network
MODEMAC
MODEM
MUX
RS232RS232
MODEMAC
MODEM
Slip Ring AC Power
DigiPortserver
#2
RS232
RS232
Network
Telescope
Dome
Building
Dew Pt. Mon RS232
Slip Ring
Monitoring and Web Software
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.
Miranda Hawarden-Ogata, Albert Fhema
Monitoring Overview
Monitor System
Collect Data
Filter Data
Archive Data Web DisplayDisplay for TOs
Birds’ eye view of existing sensors
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2’2’
2’
All sensors not mounted on the telescope itself or outside the dome will be displayed on this web page.
Sensors mounted on telescope and
mirror
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.
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
Auto-Focus Schematic
READ FOCUS WRITE FOCUS
HEXAPOD
HEXAPOD DAEMON
NSFCam SPeX
Take Image
IDL Fit Routine
StorageIQ ArchiveGUI
FWHM, Strehl, Image, Fit
Best Fit Focus
3.) cont. Focus Update
After A-F working, develop procedure to do Focus Update based on temperature model of telescope truss.
4.) Characterize Optics of Telescope
Goal: Understand factors in the telescope optics and mirror support system that limit image quality
4.) cont. TASKS
Hire Optical Consultant Measure Primary and Secondary
Mirrors with interferometric technique Provide measurement of contribution to
error budget Produce final report
5.) Provide WEB based Documentation
Integrated WEB site for IQUP Dedicated page for each sub-project
Schedule / Manpower
