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检索条件"任意字段=Conference on Advanced Telescope and Instrumentation Control Software"

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PCR - A PC based wave front reconstructor for MMT-AO

PCR - A PC based wave front reconstructor for MMT-AO

引用

2nd conference on advanced software and control for Astronomy

作者： Vaitheeswaran, Vidhya Hinz, Phil Brusa, Guido Miller, Doug Stalcup, Thomas Univ Arizona Steward Observ 933 N Cherry Ave Tucson AZ 85721 USA Large Binocular Telescope Tucson AZ 85721 USA Multiple Mirror Telescope Tucson AZ 85721 USA

ISBN: (纸本)9780819472298

PC Reconstructor (PCR) is the control software for the natural guide star and the laser guide star systems at the 6.5m Multiple Mirror telescope (MMT) operating with the adaptive secondary mirror on Mt. Hopkins south of Tucson, AZ. The PCR computes and corrects atmospheric turbulence featuring a common interface between the wave front sensor camera control link and the deformable mirror, diagnostic data management, vibration control, closed-loop data distribution & saving routines, and housekeeping modules. We report here on the development, use and the on-sky performance of the PCR.

关键词： Adaptive Optics Deformable Mirror and software

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VST telescope primary mirror active optics actuators firmware implementation

VST telescope primary mirror active optics actuators firmwar...

引用

2nd conference on advanced software and control for Astronomy

作者： Molfese, C. Schipani, P. Marty, L. INAF VSTceN Naples Italy INAF OAC Naples Italy

ISBN: (纸本)9780819472298

The VST (VLT Survey telescope) is a 2.6 m class Alt-Az telescope in installation phase at Cerro Paranal in Northern Chile, at the European Southern Observatory (ESO) site. The VST is a wide-field imaging telescope dedicated to supply databases for the ESO Very Large telescope (VLT) science and to carry out stand-alone observations in the Ultraviolet to Infrared spectral range. The VST is provided with an active optics control system to actively compensate the optical aberrations;it is based oil 84 actuators controlling the shape of the primary mirror and a hexapode for secondary mirror positioning. The present paper focuses on the implementation of the microcontroller programming firmware for the Primary Mirror Actuators Electronic control Board. The most relevant problems encountered during the implementation of this real time multitasking distributed control application are described;optimization problems due to low performing hardware platform, not provided with operating system, are also reported. Several described topics are applicable to other distributed control systems, requiring closed loop control system and communication capability with a higher level computer.

关键词： Active Optics Distributed control System Embedded control CAN Bus VST telescope

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Research and Implementation of Large telescope control System Based on Wireless Smart Sensors

Research and Implementation of Large Telescope Control Syste...

引用

2nd conference on advanced software and control for Astronomy

作者： Shuai Xiaoying Zhang Zhenchao Ren Changzhi Zhu Yongtian National Astronomical Observatories Nanjing Institute of Astronomical Optics and Technology Chinese Academy of Sciences Nanjing 210042 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China

ISBN: (纸本)9780819472298

telescope control System (TCS) becomes more and more complexity, especially the large telescope control system of force actuators for deformed mirror and position actuators for modifiable degrees of mirrors. It is very difficulty to connect thousands of sensors, actuators and controller with wired link. This paper presented a large telescope control system based on wireless smart sensor (WLTCS), connecting wireless sensors and controllers with wireless link, employing the TCP/IP protocol as communication protocol. Polling access can overcome contention and guarantee every sensor to communicate with controller in time;using intelligent control methods when some channels are interfered, multi-hop wireless paths can improve throughput and performance. The analysis and simulation indicate that WLTCS can greatly reduce complex of implementation and improve communication performance.

关键词： telescope control System TCS WLTCS wireless smart sensors

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Filling the gap between FEM and control simulations in telescope projects

Filling the gap between FEM and control simulations in teles...

引用

conference on Modeling, Systems Engineering and Project Management for Astronomy III

作者： Perrotta, F. Schipani, P. INAF Osservatorio Astron Capodimonte I-80131 Naples Italy

ISBN: (纸本)9780819472274

In order to perform detailed dynamic simulation the FEM model must be reduced in order to decrease simulation calculation time while maintaining the essential mechanical characteristics. A mathematical approach has been exploited instead of a "trial and error" procedure, with springs and masses: a more accurate fitting to the FEM model is therefore available. This paper describes the integration of Nastran and Ansys finite element software capabilities within the Matlab - Simulink computational environment.

关键词： telescope State Space Earthquake Analysis Integrated Modelling

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Acceleration feedback control on an AT

Acceleration feedback control on an AT

引用

conference on Ground-Based and Airborne instrumentation for Astronomy II

作者： Sedghi, B. Bauvir, B. Dimmler, M. European So Observ D-8046 Garching Germany

ISBN: (纸本)9780819472229

The VLT observatory operated by ESO is located oil Cerro Paranal in Chile and consists of four identical 8-m telescopes and four 1.8-m VLTI Auxiliary telescopes (ATs). In order to further improve the tracking axes performance of telescopes regarding wind rejection, different control techniques have been evaluated. Ongoing investigation and studies show that by measuring the acceleration and using that in an appropriate control strategy the performance of telescope tracking in face of external perturbation can be improved. The acceleration signal contains the non filtered information (advanced phase compared to velocity and position) of the perturbation load, e.g. wind load. As a result the reaction of the control is faster and hence the perturbation rejection is more efficient. In this paper, two acceleration feedback techniques are discussed and the results of the, measurement test on all AT telescope are presented.

关键词： Acceleration feedback telescope axes control perturbation rejection wind buffeting

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A polynomial-based trajectory generator for improved telescope control

A polynomial-based trajectory generator for improved telesco...

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2nd conference on advanced software and control for Astronomy

作者： Smith, David R. Souccar, Kainal MERLAB PC 357 S Candler St Decatur GA 30030 USA Univ Massachusetts Amherst Amherst MA 01003 USA

ISBN: (纸本)9780819472298

For any telescope, a fundamental performance requirement is the acquisition and tracking of the source. While this depends on many factors, the system accuracy is fundamentally limited by the servo tracking performance on the encoders. This tracking performance must be balanced with the need for large slewing motions to new sources. While the classical rate loop and position loop model permits basic operation, there has been increasing use through the years of gain scheduling or command pre-processors to improve telescope path planning and enable better performance. This is particularly important for telescopes that employ scanning or fast switching motions. As telescope control systems have moved to fully digital systems running at high update rates, more sophisticated approaches have become possible for telescope path planning. Taking advantage of the speed of available computation, we have developed a new real time trajectory generator that provides improved performance over previous implementations. Given a position command, the system generates a path to the desired end point. The resulting path is guaranteed to be continuous in position, velocity, and acceleration, as well as to respect specified limits in velocity, acceleration, and jerk. Significantly, the calculation provides not only the desired position over the interval, but also the velocity and acceleration, permitting their use in feedforward control to improve the tracking accuracy at all points on the path. The algorithm is presented, as well as some results with the system implemented on a real telescope.

关键词： telescope control command preprocessor trajectory generator path planning

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Improved Guiding Accuracy Through Slit Viewer of Subaru telescope

Improved Guiding Accuracy Through Slit Viewer of Subaru Tele...

引用

2nd conference on advanced software and control for Astronomy

作者： Iseki, Akihiro Tomono, Daigo Tajitsu, Akito Itoh, Noboru Miki, Sachiko Natl Inst Nat Sci Natl Astron Observ Japan Subaru Telescope 650 N Aohoku Pl Hilo HI 96720 USA Mitsubishi Electr Corp Commun Syst Ctr Amagasaki Hyogo 6618661 Japan

ISBN: (纸本)9780819472298

The Subaru telescope provides a feature of auto guiding the telescope using the slit viewer (SV). The SV guide uses the target star as a guide star. There are advantages to guide the target star directly. However, the guide accuracy was not good. The guide star is located on the slit and some lights is vignetted by the slit. But the SV guide simply took the centroid of the light to measure the position of the star without taking the vignetting of the slit into account. In 2006, we improved the SV to detect center of gravity with the vignetting of the slit taken into account. It assumes a Gaussian distribution of light except for the slit. By this improvement, the guiding accuracy of the telescope improved from 0.37 arcsec to less than 0.2 arcsec. The effect of the improvement was also confirmed with actual observations.

关键词： Ground based telescope Subaru telescope auto guiding slit viewer guiding accuracy

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controlling the Hamburg Robotic telescope: a description of the software

Controlling the Hamburg Robotic Telescope: a description of ...

引用

2nd conference on advanced software and control for Astronomy

作者： Gonzalez-Perez, Jose N. Hempelmann, Alexander Mittag, Marco Hagen, Hans-Juergen Hamburger Sternwarte D-21029 Hamburg Germany

ISBN: (纸本)9780819472298

The Hamburg Robotic telescope (HRT) is a fully automatic 1.2m telescope designed for high resolution spectroscopy of active stars. It uses the Heidelberg Extended Range Optical Spectrograph (HEROS) which is fed by a 50 mu m fiber connected to the Nasmyth focus of the telescope through ail adapter. Here we present the software that controls the whole system of the HRT. This software works both in fully automatic and interactive mode. It organizes the interaction between the Central control System (CCS: the core of the system) and the subsystems: building, telescope, spectrograph, adapter, environmental sensors (weather station and sky monitor) and scheduler. The CCS performs its operation by sending commands (ASCII messages through TCP/IP sockets to the different. subsystems. The robotic operation is divided into discrete procedures, such as "Initialization", "Observation" or "Calibration". Each procedure consists of a set of commands which will be carried out, (sequentially or even in parallel) if a, set of conditions is met.: e.g. only when one command is successfully accomplished., the next will be sent. Furthermore, the Error Handler takes the necessary actions when a problem inhibits the normal progress of the observation (e.g. bad weather, non-detection of the target or technical problems). The scheduler selects the target from a. primary list in a manner which combines the scientific priority with observational feasibility and the history of observations. Finally, we present the Automatic Reduction Pipeline developed on the basis of REDUCE, ail IDL reduction package, to obtain the final spectrum from the raw data.

关键词： Robotic telescope robotic software high resolution spectroscopy

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The European ALMA Production Antennas: extended applications of CFRP materials for high scientific performances

The European ALMA Production Antennas: extended applications...

引用

International conference on advanced Optical and Mechanical Technologies in telescopes and instrumentation

作者： Lapeyre, P. Rampini, F. Pozzobon, M. Suita, M. Damiano, O. Apers, M. Thales Alenia Space France Ave JF Champoll 26 F-31037 Toulouse France European Ind Engn Venice Italy Thales Alenia Space Italia Turin Italy Thales Alenia Space France Cannes France

ISBN: (纸本)9780819472281

The new astronomical instruments require high-performance structures. Technological innovation and new materials are needed for a structure Such as the ALMA radio-telescope in order to guarantee the specifications. The use of Carbon Fibre is highly important. The choice of CFRP helps to control the stiffness of the structure and the thermal behavior of the pieces. but a deep qualification of the material and process is fundamental. Technologies like hand lay-up vacuum bag, compression moulding, and filament winding, identify the ideal solutions for big objects, like Main Reflector Structure, Receiver Cabin, Quadripod Legs and small subassemblies like adjusters system etc.

关键词： ALMA CFRP Manufacturing process Qualification material radio-telescope structures

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A Contamination control Cover for the Mid Infrared Instrument of the James Webb Space telescope

A Contamination Control Cover for the Mid Infrared Instrumen...

引用

International conference on advanced Optical and Mechanical Technologies in telescopes and instrumentation

作者： Glauser, Adrian M. Langer, Ulrich Zehnder, Alex Guedel, Manuel Paul Scherrer Inst CH-5232 Villigen PSI Switzerland RUAG Aerosp CH-8304 Wallisellen Switzerland ETH Astron Inst CH-8093 Zurich Switzerland

ISBN: (纸本)9780819472281

During its cold mission phase at 7 K the Mid Infrared Instrument (MIRI) is the coldest spot on the James Webb Space telescope (JWST) and will act consequently as a cryopump of the instrument's environment. Since the absorption of outgassing molecules from the spacecraft (mainly water and hydrocarbons) on optical surfaces would lead to a significant degradation of the optical performance of MIRI, a Contamination control Cover (CCC) has been introduced. This coer is placed in the entrance optical path of MIRI's right after the pickoff mirror (POM) and will be closed during the instrument's cool down phase and at MIRI'S operational temperature each time the POM is heated up for decontamination. The CCC will be used further as an optical shutter for dark sky calibration and for the protection against latency images which might emerge from coronographic filter changes. Therefore, the CCC has been designed to be multi operational with approximately 3000 life cycles. A contact-free labyrinth seal allows the required reduction of molecular flow towards the instrument and avoids the possibility of any freezing. The CCC is operational between 300K and 7K and is actuated by two redundant stepper motors. In this paper we describe the design of the CCC and the results of the qualification campaign. Further a dedicated measurement of its molecular conductance at various temperatures is presented.

关键词： JWST MIRI space instrumentation cryomechanisms contamination control

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