image quality upgrade kickoff meeting

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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20.5’

20.5’

33’

33’

33’

33’

45.5’

45.5’45.5’

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2’

2’2’

2’

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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20.5’

20.5’

33’

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33’

33’

45.5’

45.5’45.5’

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2’

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