Acronyms
The following list includes acronyms used on system level and shall be common to all documents.
Acronyms that are only used in one document shall be defined at the beginning of the document with a “only used in this document”.
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Acronym
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Meaning
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Explanation
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Used in / Link
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A
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AD
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Applicable Document
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Legally binding documents and reports
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ADC
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Atmospheric Dispersion Corrector
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AIT
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Assembly, Integration and Test
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In ESO terminology this is the phase in Europe that ends with the PAE (more general, should be MAIT)
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AIV
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Assembly, Integration and Verification
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In ESO terminology this is the phase in Chile that ends with the PAC
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AO
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Adaptive Optics4
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AIT
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Assembly, Integration and Test
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ANDES
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ArmazoNes high Dispersion Echelle Spectroscopy
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Name of the instrument
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All documents
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arcsec
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Arc Second
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B
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BOL
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Beginning of Life
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C
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CCD
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Charged Coupled Device
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Area detectors
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CCS
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Central Control System
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CoG
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Center of Gravity
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CR
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Coudé-room
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Part of the ELT
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CU
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Calibration Unit
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Subcomponent
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D
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E
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EH
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Entrance Hall
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ELT
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Extremely Large Telescope
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ESO
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European Southern Observatory
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F
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F2F
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Fiber-To-Fiber link
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In-fiber connection point
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FDR
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Final Design Review
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Milestone of the project, controlled by ESO
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FE I-IV
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Front End I-IV
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Pickup of the beam coming from the telescope.
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FP
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Fabry-Pérot
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Etalon, Interferometer, Resonator in Literature
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FSR
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Free Spectral Range
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Spectral range between two spectral features
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FTS
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Fourier-Transform Spectrograph
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G
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GPS
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Global Positioning System
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H
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HCL
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Hollow-Cathode Lamps
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Wavelength calibration lamps
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CU
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HIRES
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High Resolution Spectrograph
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Outdated name of the instrument /project -> ANDES
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I
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IAA
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Instrument Assembly Area at Armazones
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ICD
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Interface Control Document
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ESO-Standard, that is used to define Interfaces and their Responsibility
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IFU
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Integral Field Unit
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ILS
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Instrumental Line Shape
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See Definitions below
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IP
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Instrumental Profile
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see also linespread function or ILS
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IR
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Infrared
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J
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K
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L
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LCS
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Local Control System
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LCU
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Local Control Unit
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LDP
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Light Distribution Point
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Connects, switches light sources to the OUP of the CU
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LGS
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Laser Guide Star
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LUT
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Look-Up table
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M
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mas
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Milli-arcseconds
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MAIT
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Manufacturing, Assembly, Integration and Test
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MS
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Main Structure
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MTBF
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Mean Time Between Failure
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N
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NCR
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No-Collapse Requirement
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NGS
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Natural Guide Star
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O
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OM
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Observing Mode
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OUP
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Output Port
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Fiber ports used in the CU → Optical Interface to the Fiber WP
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P
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PA
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Product Assurance
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PAC
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Preliminary Acceptance Chile
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PAE
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Preliminary Acceptance Europe
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ESO-controlled milestone of the project
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PCF
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Photonic Crystall Fibre
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Used in the Astrocomb for spectral broadening
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PD
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Photodiode
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PDR
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Preliminary Design Review
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ESO-controlled milestone of the project
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PHL
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Preliminary Hazard List
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PI
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Principal Investigator
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PFS
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PreFocal Station
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PT
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Product Tree
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PTV
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Peak To Valley
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Q
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QA
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Quality Assurance
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R
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RBM
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Rigid Body Motion
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RD
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Reference Documents
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background references only.
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rms
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Root Mean Square
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A statistical Value, see below
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RP
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Resolving Power
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lambda/deltaLambda
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S
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SAR
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System Architecture Review
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SCaO
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Single Conjugate Adaptive Optics
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SCP
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Service Connection Point
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SE
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Systems Engineer
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SoW
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Statement of Work
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T
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TBC
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To be Confirmed
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TBD
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To be Defined (frequently To be Discussed)
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TLR
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Top Level Requirement
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TRL
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Technical Readiness Level
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see definitions
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TRS
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Technical Requirement Specification
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TSE
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Thermal Self Emission
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U
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V
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VIS
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Visible Range of Light
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(400 nm - 700 nm as defined by ISO Standards)
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W
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WBS
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Work Breakdown Structure
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WCS
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World Coordinate System
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WFS
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WaveFront Sensor
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WLM
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Wavelength Marker
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frequency-stabilized Lasers, used in the CU to anchor the wavelength solution
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WP
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Work Package
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WPM
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Work Package Manager
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X
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Y
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Z
Definitions
The following lists include definitions for terms to be used in the respective field.
ESO
General Terms
Telescope
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Term
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Explanation
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Author
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Nasmyth-platform
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Platforms on both sides of the ELT with optical interface to the Nasmyth-train.
Instrument
Requirements
Components
Optical
Electrical
Software
Data Reduction
Precision and Accuracy
Auxiliary
The TRL list is taken from industry. ESO definitions will be implemented soon.
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TRL
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Definition
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Comment
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1
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Basic principles observed and reported
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2
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Technology concept formulated
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3
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Experimental proof of concept
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4
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Technology validated in lab
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5
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Technology validated in relevant environment
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→ Observatory on the mountain
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6
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Technology demonstrated in relevant environment
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7
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System prototype demonstration in operational environment
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8
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System complete and qualified
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9
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acronyms, terms and definitions are an assembly from current documents. Some of them come from ESO, some from ANDES.