Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.eso.org/projects/www.eso.org.projects.ngc/General/16072008-ccumani.pdf Дата изменения: Mon Jul 21 00:15:50 2008 Дата индексирования: Sun Apr 10 23:43:01 2016 Кодировка: Поисковые слова: messier catalog

NGC OPTICAL SOFTWARE
Claudio Cumani NGC Presentation - 2008, July 16


Differences btw IR and OPT detector controllers: intrinsic
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"Exposure" handling
Optical Rigid scheme for exposures (wipe - integrate - ["move charges on detector while integrating"] - read ). Active intervention of the control-server during the exposure is ti ti th th required (application of new voltages in each state). "Active" interface to different kinds of shutter controllers (open/close, status check, open/close delays, etc.). Infrared Detector continuously read-out (infinite loop). Starting an exposure = starting transfer and storage of data. Once exposure is started, control server mainly reacts passively on incoming data-frames. No "active" interface to external devices (interfaces through trigger signals, e.g., for nodding).


Differences btw IR and OPT detector controllers: intrinsic
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Data handling
Infrared Computationally intensive different data pre-processing, read-out mode dependent. Optical Detector read-out just once at the end of an exposure. th The only processing to be done is pixel sorting and offset calibration (centroiding and bias-subtraction on request).


Differences btw IR and OPT detector controllers: historical
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optical detector controllers are requested to interface/control also devices which are not ­ strictly speaking - part of the detector, like vacuum and temperature control (and write values in FITS file header)


Optical NGC needs its own software
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Base software common to Infrared and Optical detectors to interface the hardware (thanks Joerg) At higher level: hi NGCIRSW and NGCOSW


NGC Software Environment
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Instrument Software

Commands/Replies

Data

FITS Files

Configuration Files Setup Files

NGCOSW

Data

RTD

Dictionary

Online database

Log System

Error System


NGCOSW Processes
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Commands Replies

IWS System Control Image Transfer Client FITS File

Memory (RTD) Exposure Control Image Transfer Server

Shutter

DFE Server LLCU


Operational Modes
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Normal mode: the NGC detector electronics is the electronics connected. Hardware-Simulation mode: the NGC the NGC detector electronics is simulated.
The FIERA LCU-Simulation mode is equivalent to FIERA Hardware-Simulation. The NGCOSW can either be distributed on both the IWS and the NGC LLCU or run completely on one of the two platforms.


Optical "Exposures Modes"
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Exposure Modes define the set of Modes set voltages, clock patterns and sequences to be applied to the different "steps" of an exposure (wipe, integrate, read). Same approach of FIERA of FIERA Exposure Modes are defined in the detector Configuration File (different for (dif each instrument)


Temperature/vacuum monitoring
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3 options under discussion: Vi NGC Via NGC LLCU serial port (Ю la FIERA) serial (Ю la FIERA) Via standard LCU (Ю la IRACE) Via Serial-to-ethernet adapter


NGCOSW Graphical User Interface
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NGCOSW code
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NGCOSW code generated using the wsf (workstation software framework) tool developed by SDD See: Andolfato L., Karban R., "Workstation Software Framework", article for SPIE 2008 "Astronomical Telescopes and Instrumentation" Conference, Marseille, Jun 23-28, 2008


Documentation
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Cumani C., Balestra A. Balestra "NGC ­ Optical DCS ­ User Manual" VLT-MAN-ESO-13660-4086 Last issue: 3.0 - 18/06/2008


BlueWave
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