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

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control software and user interface for the Canarias Infrared Camera Experiment (CIRCE)

Control software and user interface for the Canarias Infrare...

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conference on Ground-Based and Airborne instrumentation for Astronomy

作者： Marin-Franch, Antonio Eikenberry, Stephen S. Charcos-Llorens, Miguel V. Edwards, Michelle L. Varosi, Rank Hon, David B. Raines, Steven N. Warner, Craig D. Rashkin, David Univ Florida 211 Bryant Space Sci Ctr Gainesville FL 32611 USA

ISBN: (纸本)0819463345

The Canarias InfraRed Camera Experiment (CIRCE) is a near-infrared visitor instrument for the 10.4-meter Gran Telescopio Canarias (GTC). This document shows CIRCE software. It will have two major functions: instrument control and observatory interface. The instrument control software is based on the UFLIB library, currently used to operate FLAMINGOS-1 and T-ReCS (as well as the CanariCam and FLAMINGOS-2 instruments under development in the University of Florida). The software interface with the telescope will be based on a CORBA server-client architecture. Finally, the user interface will consist of two java-based interfaces for the mechanism/detector control, and for quick look and analysis of data.

关键词： near infrared camera control software user interface

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Real-time control system for the Keck Interferometer Nuller: methods and maintenance - art. no. 62740K

Real-time control system for the Keck Interferometer Nuller:...

引用

conference on advanced software and control for Astronomy

作者： Garcia, Jean I. Colavita, M. Mark Booth, Andrew J. CALTECH Jet Prop Lab Pasadena CA 91125 USA

ISBN: (纸本)0819463396

The real-time control system for the Keck Interferometer Nuller provides the N-band fringe tracking capabilities of the instrument, as well as correcting for atmospheric dispersion in the system. There are three closed-loop servos for controlline, the N-band path, as well as two K-band servos which provide open-loop control. A system of synchronized "gates" allows all N-band fringe trackers to operate simultaneously, making it possible to interleave servo corrections with data collection. Several methods of improving servo performance and maintenance of control schemes are discussed.

关键词： real-time control control systems nulling interferometry atmospheric dispersion

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A matlab based toolbox for active optics

A matlab based toolbox for active optics

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conference on advanced software and control for Astronomy

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

ISBN: (纸本)0819463396

Active optics systems have been designed for most of the recently built medium and large telescopes. Anyway the number of working active optics systems is still relatively small and there are some differences in the various technologies and solutions. This paper describes a toolbox for active optics simulation developed in the framework of a specific project, but general enough to be useful in most of the cases. The toolbox deals with both off-line and on-line activities: it generates fictitious Shack-Hartmann fits images, supports different kinds of polynomials (Zernike, quasi-Zernike, normalized Zernike, minimum energy modes) to fit the wavefront data, and performs calculation of primary mirror actuator forces and secondary mirror position corrections, simulating also the usage of hexapod systems.

关键词： simulation active optics telescope control software

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Distributed computing architecture for image-based wavefront sensing and 2D FFTs

Distributed computing architecture for image-based wavefront...

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conference on advanced software and control for Astronomy

作者： Smith, Jeffrey S. Dean, Bruce H. Haghani, Shadan NASA Goddard Space Flight Ctr Opt Branch Greenbelt MD 20771 USA

ISBN: (纸本)0819463396

Image-based wavefront sensing provides significant advantages over interferometric-based wavefront sensors such as optical design simplicity and stability. However, the image-based approach is computationally intensive, and therefore, applications utilizing the image-based approach gain substantial benefits using specialized high-performance computing architectures. The development and testing of these computing architectures are essential to missions such as James Webb Space telescope (JWST), Terrestrial Planet Finder-Coronagraph (TPF-C and CorSpec), and the Spherical Primary Optical telescope (SPOT). The algorithms implemented on these specialized computing architectures make use of numerous two-dimensional Fast Fourier Transforms (FFTs) which necessitate an all-to-all communication when applied on a distributed computational architecture. Several solutions for distributed computing are presented with an emphasis on a 64 Node cluster of digital signal processors (DSPs) and multiple DSP field programmable gate arrays (FPGAs), offering a novel application of low-diameter graph theory. Timing results and performance analysis are presented. The solutions offered could be applied to other computationally complex all-to-all communication problems.

关键词： Digital Signal Processors (DSP) Fast Fourier Transform (FFT) James Webb Space telescope (JWST) Field Programmable Gate Arrays (FPGA) phase retrieval

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User interaction with the LUCIFER control software

User interaction with the LUCIFER control software

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conference on advanced software and control for Astronomy

作者： Knierim, Volker Juette, Marcus Polsterer, Kai Schimmelmann, Jan Ruhr Univ Bochum Inst Astron D-44780 Bochum Germany

ISBN: (纸本)0819463396

We present the concept and design of the interaction between users and the LUCIFER control software Package. The necessary functionality that must be provided to a user depends on and differs greatly for the different user types (i.e., engineers and observers). While engineers want total control over every service provided by the software system, observers are typically only interested in a fault tolerant and efficient user interface that helps them to carry out their observations in the best possible way during the night. To provide the functionality engineers need, direct access to a service is necessary. This may harbor a possible threat to the instrument in the case of a faulty operation by the engineer, but is the only way to test every unit during integration and commissioning of the instrument, and for service time later on. The observer on the other hand should only have indirect access to the instrument, controlled by an instrument manager service that ensures the necessary safety checks so that no harm can be done to the instrument. Our design of the user interaction provides such an approach on a level that is transparent to any interaction component regardless of interface type (i.e., textual or graphical). Using the interface and inheritance concepts of the Java Programming Language and its tools to create graphical user interfaces, it is possible to provide the necessary level of flexibility for the different user types on one side, while ensuring maximum reusability of code on the other side.

关键词： user interface design software concepts Java NIR instruments

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An optimization software package for power & energy

An optimization software package for power & energy

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16th Annual Joint ISA POWID/EPRI controls and instrumentation conference and 49th Annual ISA Power Industry Division, POWID Symposium 2006

作者： Vohryzek, Jáchym Havlena, Vladimír Findejs, Jiří Jech, Jan Honeywell Prague Laboratories Pod Vodarenskou vezi 4 182 08 Prague 8 Czech Republic Honeywell Process Solutions Na Strži 65/1702 14000 Prague 4 Czech Republic

Supervisory level software applications may provide a low-cost, high return alternative to expensive boiler retrofits for improving operational profit as well as reducing emissions. A suite of advanced control and real-time optimization closed-loop components, running on top of the standard process regulatory and control system, is presented in this paper.

关键词： Computer software

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control of a woofer tweeter system of deformable mirrors

Control of a woofer tweeter system of deformable mirrors

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conference on advanced software and control for Astronomy

作者： Hampton, Peter J. Conan, Rodolphe Bradley, Colin Agathoklis, Pan Univ Victoria Dept Elect & Comp Engn Victoria BC V8W 2Y2 Canada

ISBN: (纸本)0819463396

This paper describes the control of two deformable mirrors (DM) and a tip tilt mirror for adaptive optics. The purpose of this experimental adaptive optics system at the University of Victoria is to prove the Woofer Tweeter concept for use in instruments for the Thirty Meter telescope (TMT) which is currently under development. The first deformable mirror is a large stroke DM (Woofer) capable of lower frequency correction in both the temporal and spatial domains. The other DM (Tweeter) is capable of the high temporal and spatial frequency corrections of the turbulence. The response speed of the Woofer is incorporated into the Tweeter controller in order to allow for appropriate offloading from the Tweeter to the Woofer. In order to determine which Tweeter shapes must compensate for the slower Woofer and which are not coupled to the Woofer, the cross correlation of the devices is determined. The method of converting the wave front sensor (WFS) measurements to control signal error is given. The transfer functions of the controller are provided, along with rejection ratio plots, bandwidths and amplitude response to system noise.

关键词： adaptive optics control digital discrete Woofer Tweeter TMT

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Polarization analysis in a Very High Resolution telescope (VHRT)

Polarization analysis in a Very High Resolution Telescope (V...

引用

2nd International Symposium on advanced Optical Manufacturing and Testing Technologies

作者： Zhang, Y Li, L Huang, YF Liu, JG Beijing Inst Technol Dept Photoelect Engn Beijing 100081 Peoples R China

ISBN: (纸本)0819461881

A Very High Resolution telescope (VHRT) is designed as a space-to-earth remote sensor and the polarization effect in this VHRT is analyzed in this paper. First, the theory of polarization effect is reviewed. Second, the Jones arithmetic of polarization aberrations in VHRT is presented. Then, CODE V software is used to realize the polarization ray trace in this system and the results of the polarization effect analysis are obtained. The output information includes the plot of Modulation Transfer Function (MTF), the plot of Point Spread Function (PSF), pupil map, relative illumination, illumination, distortion and Strehl ratio. Finally, effective methods to control the polarization effect in an optical system are given. According to the results of analysis, we have drawn the following conclusions. Polarization effect in an optical system shouldn't be ignored to improve the imaging quality;with the incident angle as small as possible to control the polarization effect. Coating design must be considered carefully for the optical design.

关键词： polarization effect polarization aberration Jones arithmetic diattenuation retardance optical thin film

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The LINC-NIRVANA fringe and flexure tracker: Piston control strategies - art. no. 62741P

The LINC-NIRVANA fringe and flexure tracker: Piston control ...

引用

conference on advanced software and control for Astronomy

作者： Rost, Steffen Bertram, Thomas Straubmeier, Christian Wang, Yeping Eckart, Andreas Univ Cologne Inst Phys 1 D-50937 Cologne Germany

ISBN: (纸本)0819463396

The Fringe and Flexure Tracking System (FFTS) is designed to correct the atmospheric piston variations and the instrumental flexure during the NIR interferometric image acquisition of the LINC-NIRVANA camera at the LBT. The interferometric image quality depends on the performance of these corrections. Differential piston and flexure effects will be detected and corrected in a real-time closed loop by analyzing the PSF of a guide star at a frequency of up to several hundred Hz. A dedicated piston mirror will then be moved in a corresponding manner by a piezo actuator. The FFTS is expected to provide a residual piston of better then 0.1 lambda at the central wavelength of the science band. Thus, the required correction bandwidth is 10-20 Hz as differential piston simulations of different seeing conditions indicate. Therefore, a sampling frequency of 100-200 Hz is required to correct OPD variations. The upper limit for the loop frequency is the resonance frequency of the mirror and the response function respectively. The piston mirror as the actuator and the FFTS detector as the sensor feedback are embedded in a very complex system. Many control loop aspects like sampling frequencies, delays, controller algorithm and control bandwidth have to be identified. With accurate simulations of the system the limits of atmospheric and instrumental conditions for reliable closed loops can be determined against the respective control parameters. We present strategies for the closed-loop control of the piston correction which are suitable to achieve the 0.1 lambda requirement and the optimal overall imaging performance with a sufficient "all-purpose" control stability.

关键词： LBT LINC-NIRVANA fringe tracking closed-loop controller piston correction OPD control

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The Green Bank telescope

The Green Bank Telescope

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conference on Ground-Based and Airborne telescopes

作者： Prestage, R. M. Natl Radio Astron Observ Green Bank WV 24944 USA

ISBN: (纸本)0819463329

The National Radio Astronomy Observatory Green Bank telescope (GBT) is the world's largest fully steerable telescope. The GBT has now been in routine operation for over two years, observing at frequencies up to 50 GHz. In order to deliver the tracking accuracies required at 50 GHz, we solve simultaneously for gravitational and thermal effects in the development of the static pointing and focus tracking models. A precision temperature sensor system then generates additional real-time corrections to compensate for varying thermal gradients in the antenna. Collimation and surface accuracy requirements are met by an active surface control system which combines initial corrections derived from a finite element model of the antenna with additional terms derived from astronomical phase-retrieval holography measurements. The GBT has a rich suite of instrumentation including receivers which cover almost the complete frequency range from similar to 290 MHz to 50 GHz, and backends for spectroscopy, pulsar observing, broadband continuum, very long baseline interferometry and planetary radar reception. A 64-pixel bolometer camera is under development by a consortium including UPenn, NASA-GSFC, NIST, UCardiff and NRAO. Recent software developments include an extremely flexible application which combines traditional interactive observing, scheduling-block based observing and real-time monitoring and data display in a single, convenient interface. In this paper I will summarize the current performance of the GBT, and review some recent science results. I will also describe how plans changed with time, and review some of the lessons learned in the development of the telescope.

关键词： radio telescopes ground-based telescopes millimeter-wave telescopes astronomy radio instrumentation active surface metrology systems

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