Adaptive Optics最新文献

筛选
英文 中文
Results from the Cassegrain adaptive optics system of the Mount Wilson 100-inch telescope 来自威尔逊山100英寸望远镜的卡塞格林自适应光学系统的结果
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.amb.13
J. Shelton, T. G. Schneider, D. McKenna, S. Baliunas
{"title":"Results from the Cassegrain adaptive optics system of the Mount Wilson 100-inch telescope","authors":"J. Shelton, T. G. Schneider, D. McKenna, S. Baliunas","doi":"10.1364/adop.1996.amb.13","DOIUrl":"https://doi.org/10.1364/adop.1996.amb.13","url":null,"abstract":"Since June of 1994 we have been operating and improving a natural-guide-star adaptive optics system on the Mount Wilson 100-inch telescope.1,3 The system is routinely operated by one person plus a telescope operator. First astronomical observations have achieved image profiles with a full-width-at-half-max (FWHM) of 0.068 arcsec, using a silicon CCD with no wavelength discrimination (Fig. 1).","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116634283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
New Wavefront Reconstructor for the MMT Adaptive Secondary 一种新的MMT自适应次级波前重构器
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.tua34
S. Stahl, T. Barrett
{"title":"New Wavefront Reconstructor for the MMT Adaptive Secondary","authors":"S. Stahl, T. Barrett","doi":"10.1364/adop.1995.tua34","DOIUrl":"https://doi.org/10.1364/adop.1995.tua34","url":null,"abstract":"In this paper we present a reconstructor optimized to fully utilize spatial and temporal correlations of the measured wavefront and a hardware implementation being built for the adaptive optics system for the new 6.5m single-mirror MMT. We compare the projected performance for a closed-loop system which drives the mirror to obtain a wavefront sensor null with a system designed to “optimally” utilize measurements from the source--which may be a laser guide star.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124947441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Conjugating AO Correction to Turbulence in the WHT AO System Design WHT AO系统设计中对湍流的共轭AO校正
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.pd9
M. Wells
{"title":"Conjugating AO Correction to Turbulence in the WHT AO System Design","authors":"M. Wells","doi":"10.1364/adop.1995.pd9","DOIUrl":"https://doi.org/10.1364/adop.1995.pd9","url":null,"abstract":"One of the factors which limits the performance of a NGS AO system is the brightness of available stars. This, when combined with a requirement for a high sky coverage and a moderate Strehl ratio (see Table 1), means that reference stars up to about 1.5 arcmin from the science object have to be used.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122742097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simple Neural Networks as Wavefront Slope Predictors: Training and Performance Issues 作为波前斜率预测器的简单神经网络:训练和性能问题
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.athc.8
P. Gallant, G. Aitken
{"title":"Simple Neural Networks as Wavefront Slope Predictors: Training and Performance Issues","authors":"P. Gallant, G. Aitken","doi":"10.1364/adop.1996.athc.8","DOIUrl":"https://doi.org/10.1364/adop.1996.athc.8","url":null,"abstract":"Artificial neural networks have gained significant popularity over the past several years in a wide variety of engineering applications. This popularity is due in part to the ability of a neural network that is trained using a supervised training rule such as error backpropagation to acquire a nonparametric representation of the mapping between a set of inputs and outputs without any specific knowledge of the application domain. Given a sufficient number of nonlinear terms, represented by a number of hidden-layer neurons, a multilayer neural network can model any mathematical function that is continuous and differentiable (Hecht-Nielsen, 1990). Difficulties can arise however when a network is trained with a limited amount of noisy “real” data and is then expected to operate as part of a system for a specific application. The network must acquire an internal representation, as stored in its weights, during the training phase that subsequently generalizes well to unseen data. In the case of a prediction application, generalization capability becomes the paramount design criteria. The generalization performance of a trained network is a strong function of several factors, including: the architecture and complexity of the network, the type of supervised training rule employed, and the manner in which data is preprocessed and presented to the network.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116752788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adaptive optics requirements for a ground-to-space laser communications system 地对空激光通信系统的自适应光学要求
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.thc3
R. Tyson
{"title":"Adaptive optics requirements for a ground-to-space laser communications system","authors":"R. Tyson","doi":"10.1364/adop.1995.thc3","DOIUrl":"https://doi.org/10.1364/adop.1995.thc3","url":null,"abstract":"Advances in adaptive optics have made it possible to consider their use to enhance ground-to-space laser communications systems. Adaptive optics are used to counteract the effects of atmospheric turbulence and deliver a beam undistorted through the atmosphere. This paper examines the system level requirements of an adaptive optical system in terms of communication parameters. An optical communications link must deliver a modulated beam to a receiving sensor with minimal distortion of the modulated signal. Distortion which stretches pulses, distorts pulse shapes, or otherwise randomizes the pulse intensity or location contributes to a higher bit error rate. The ability of adaptive optics to compensate for atmospheric scintillation is studied with respect to its effect on signal fade and surge.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128218493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new method for separating atmospheric layers using a Shack-Hartmann Curvature Sensor 一种利用Shack-Hartmann曲率传感器分离大气层的新方法
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.awc.2
A. Glindemann, T. Berkefeld
{"title":"A new method for separating atmospheric layers using a Shack-Hartmann Curvature Sensor","authors":"A. Glindemann, T. Berkefeld","doi":"10.1364/adop.1996.awc.2","DOIUrl":"https://doi.org/10.1364/adop.1996.awc.2","url":null,"abstract":"Using a Shack-Hartmann sensor for measuring the wavefront gradient and the wavefront curvature by integrating over the subapertures allows to separate the influence of atmospheric layers.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128775481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
An Optical Ultrahigh Resolution Spectrograph with the Adaptive Optics 一种自适应光学超高分辨率摄谱仪
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.atub.5
J. Ge, B. Jacobsen, J. Angel, N. Woolfv, J. Black, M. Lloyd-Hart, P. Gray, R. Fugate
{"title":"An Optical Ultrahigh Resolution Spectrograph with the Adaptive Optics","authors":"J. Ge, B. Jacobsen, J. Angel, N. Woolfv, J. Black, M. Lloyd-Hart, P. Gray, R. Fugate","doi":"10.1364/adop.1996.atub.5","DOIUrl":"https://doi.org/10.1364/adop.1996.atub.5","url":null,"abstract":"A prototype optical wavelength ultrahigh resolution echelle cross-dispersed spectrograph has been tested at the Starfire Optical Range (SOR) 1.5 m telescope (Woolf et al. 1995; Ge et al. 1996). To our knowledge this is the first high resolution spectrograph to take advantage of the diffraction limited images produced by an adaptive optics system. Because of the sharpened images produced by the adaptive optics at visible wavelength, about r0/D ~ 1/15 in the seeing-dominant domain, the narrow slits necessary for high resolution can be used without a large loss of light. This is a great advantage when compared with conventional high resolution spectrographs (e.g. Lambert et al. 1990; Diego et al. 1995). In addition, the smaller image widths inherent with the adaptive optics system allow the orders to be spaced closer together on the chip, allowing more orders to be observed simultaneously.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129655875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Status of the Design of an Adaptive Secondary for the 6.5m conversion of the MMT telescope MMT望远镜6.5m转换自适应二次系统设计现状
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.athc.17
G. Brusa, P. Gray, C. Vecchio, P. Salinari, W. Gallieni
{"title":"Status of the Design of an Adaptive Secondary for the 6.5m conversion of the MMT telescope","authors":"G. Brusa, P. Gray, C. Vecchio, P. Salinari, W. Gallieni","doi":"10.1364/adop.1996.athc.17","DOIUrl":"https://doi.org/10.1364/adop.1996.athc.17","url":null,"abstract":"The advantages of using an adaptive secondary mirror for astronomical high resolution observations are very attractive. The drastic reduction of optical surfaces along the optical train of the adaptive system will allow a very compact system with high transmission and low emissivity. Also such a system has the potentiality of a very high actuator density.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130560833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simultaneous short exposure measurements of anisoplanatism using compensated images at optical and near infrared wavelengths 利用光学和近红外波长补偿图像的同时短曝光测量各向异性
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.awd.6
J. Christou, B. Ellerbroek, T. Pennington, J. Riker, J. Roark, E. Spillar
{"title":"Simultaneous short exposure measurements of anisoplanatism using compensated images at optical and near infrared wavelengths","authors":"J. Christou, B. Ellerbroek, T. Pennington, J. Riker, J. Roark, E. Spillar","doi":"10.1364/adop.1996.awd.6","DOIUrl":"https://doi.org/10.1364/adop.1996.awd.6","url":null,"abstract":"Work is in progress towards a series of observations to characterize the short- and long-exposure performance of an adaptive optics system as a function of wavelength and field-of-view. A principal goal of this effort will be to characterize the anisoplanatism observed in the infrared while using an off-axis visual guide star for tracking. More generally, we will investigate the effects of various methods for real-time and post-facto image tracking upon image quality in the presence of anisoplanatism. The instrumentation for the experiment is similar to that reported in [1], with the addition of an infrared sensor. Images are formed using the 1.5-meter telescope at the U. S. Air Fore Phillips Laboratory Starfire Optical Range and its adaptive optics system [2]. A beamsplitter sends the visible portion of the spectrum to a high speed, 64 by 64 pixel MIT/Lincoln Laboratory CCD array with high quantum efficiency and low readout noise. Re-imaging optics enable both components of wide binaries to be formed on the same array with a plate scale of 289 nrad/pixel. The infrared portion of the spectrum is imaged onto a 256 by 256 pixel NICMOS III detector with Infrared Labs electronics yielding approximately 100e- read noise. We are able to obtain simultaneous wave front sensor, optical, and infrared data with integration times of from 1 to 50 milliseconds.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114223027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Sodium Layer Scattering Physics 钠层散射物理分析
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.amb.30
P. Milonni, J. Telle
{"title":"Analysis of Sodium Layer Scattering Physics","authors":"P. Milonni, J. Telle","doi":"10.1364/adop.1996.amb.30","DOIUrl":"https://doi.org/10.1364/adop.1996.amb.30","url":null,"abstract":"We describe calculations of the photon return signals from mesospheric sodium fluorescence excited by laser pulse trains. The theory combines a full density–matrix treatment of the sodium D2 line, including Doppler broadening and polarization–dependent optical pumping effects, with the Fried model of optical propagation through the turbulent atmosphere.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121563069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信