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  • Calibration Specifications

    Doc No. SALT ???????? Issue A

    1

    APPROVAL SHEET

    TITLE : SALT Instrument Calibration System

    DOCUMENT NUMBER : 15??AS0000 ISSUE: A

    SYNOPSIS : This document describes the technical requirements for theSALT calibration systems, comprising the Payload InstrumentCalibration System and the Dome Instrument CalibrationSystem. It defines the functional, operational, software andhardware requirements that must be met.

    KEYWORDS : Science instrument calibrations; payload instrumentcalibration system; dome instrument system; calibrationlamps; calibration screen; illumination

    PREPARED BY : David BuckleySALT Project Scientist

    APPROVED :Leon NelTCS PROJECT MANAGER

    Gerhard SwartSALT SYSTEMS ENGINEER

    DATE : 26 November 2002

  • Calibration Specifications

    Doc No. SALT ???????? Issue A

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    This issue is only valid when the above signatures are present.

  • Calibration Specifications

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    ACRONYMS AND ABBREVIATIONS

    CCAS Centre-of-Curvature Alignment SensorCCD Charge-coupled Device (Camera)CFE Client-furnished EquipmentCOTS Commercial off the shelfDICS Dome Instrument Calibration SystemDP Data ProcessorDec DeclinationEE(50) Image diameter containing 50% of Enclosed EnergyEL Event Logger (computer)FoV Field-of-ViewGUI Graphical User InterfaceHET Hobby-Eberly TelescopeHRS High-resolution SpectrographI/O Input/Output (Device)ICD Interface Control DossierIR InfraredLRS Low-resolution SpectrographMMI Man-Machine InterfaceMPB Moving Pupil BaffleMTBF Mean Time Between FailuresMTTR Mean Time to RepairMOS Multiple Object SpectroscopyOCS Observatory Control SystemPC Personal ComputerPICS Payload Instrument Calibration SystemPFIS Prime Focus Imaging SpectrographPFP Prime Focus PayloadPI Principal Investigator (Astronomer)PM Primary MirrorRA Right AscensionSA SALT AstronomerSAAO South African Astronomical ObservatorySAC Spherical Aberration CorrectorSALT Southern African Large TelescopeSICS SALT Instrument Calibration SystemsSNR Signal to Noise ratioSO SALT OperatorSW SoftwareTAC Time Assignment CommitteeTBC To Be ConfirmedTBD To Be DeterminedTCS Telescope Control SystemUPS Uninterruptible Power Supply

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    DEFINITIONS

    Acquisition time This is the length of time required to put the target at adesired position (a bore-sight), within the offset pointingrequirement, from end-of-slew, until start of theintegration.

    Arc A type of lamp (e.g. hollow cathode arc lamp) used tocreate an emission line spectrum which is used towavelength calibrate spectroscopic data.

    Baffle A mechanical aperture or stop used to exclude unwantedlight rays from entering an optical system.

    Calibration A procedure employed by the SA and/or PI to remove anyinstrumental effects (e.g. introduced by the telescopesystem or the science instrument) from an astronomicalobservation.

    Cost baseline This is the design baseline at the end of the conceptstudy, which was used to determine the cost of theSALT project, and on which the budget is based. It iscontained in the SALT Report of Interim Project Team,April 1999.

    Flat field A type of calibration produced by a continuum lamp (e.g.quartz halogen) which is used to correct for sensitivityvariations, with as a function of field angle and/orwavelength, is a science instrument.

    Growth Path This includes concepts that have not been fully explored,and do not form part of the deliverable. However, theseconcepts have to form part of the decision makingprocess in reaching the Technical or Cost Baselines.

    Technical Baseline This is the design baseline that is required to fulfil therequirements of the SALT Observatory ScienceRequirements, Issue 7.1, and is the topic of thisSpecification. This baseline has not been costed, and thebudget implications will have to be ratified by the SALTBoard.

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    TABLE OF CONTENTS

    1 Scope ..........................................................................................................81.1 Identification..................................................................................................................................81.2 System overview..........................................................................................................................81.3 Summary of calibration requirements.....................................................................................91.4 Instrument calibration operations............................................................................................91.4.1 System Efficiency: .....................................................................................................................91.4.2 Configuration time:....................................................................................................................101.4.3 Software and control efficiency:.............................................................................................101.4.4 Prior scheduling:.......................................................................................................................101.4.5 Interaction with the database:..................................................................................................101.4.6 Automation: ..............................................................................................................................10

    2 Referenced documents ...........................................................................113 Customer Furnished Equipment and Responsibilities ........................124 Functional Requirements........................................................................134.1 Calibrations..................................................................................................................................134.2 Calculating Flat Fields ................................................................................................................134.2.1 Flat Fielding Process ................................................................................................................144.2.2 Flat Field Science Requirements ..............................................................................................144.3 Moving Pupil ................................................................................................................................154.4 Wavelength Calibrations ...........................................................................................................154.4.1 Wavelength Calibration science requirements.........................................................................15

    5 PICS System Technical Requirements...................................................155.1 Interfaces.....................................................................................................................................155.1.1 External Interfaces...................................................................................................................175.1.2 Internal Interfaces ....................................................................................................................175.2 Schematic diagrams ..................................................................................................................175.2.1 PICS lamp box schematic .........................................................................................................185.2.2 PICS Illuminator schematic........................................................................................................185.3 Flat Field calibration lamp requirements...............................................................................195.3.1 Flat Field lamp type...................................................................................................................195.3.2 Lamp power supply and control ..............................................................................................195.3.3 Heat filtering .............................................................................................................................195.4 Wavelength Calibration Lamp requirements........................................................................195.4.1 Hollow cathode lamps..............................................................................................................195.4.2 Penray arc lamps .....................................................................................................................195.5 Lamp box requirements...........................................................................................................205.5.1 Light and airtight.......................................................................................................................205.5.2 Material and insulation..............................................................................................................205.5.3 Cooling......................................................................................................................................205.5.4 Power.......................................................................................................................................205.6 Filters............................................................................................................................................205.6.1 Colour balance filters ...............................................................................................................205.6.2 Neutral density filters .............................................................................................

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