发布求助
文献互助 智能选刊 最新文献

Adaptive Optics最新文献

筛选
英文 中文
Fast CCD Imaging Systems for Tilt-Tip and Wavefront Sensing Applications 用于倾斜尖端和波前传感的快速CCD成像系统
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.athc.1
C. Mackay
{"title":"Fast CCD Imaging Systems for Tilt-Tip and Wavefront Sensing Applications","authors":"C. Mackay","doi":"10.1364/adop.1996.athc.1","DOIUrl":"https://doi.org/10.1364/adop.1996.athc.1","url":null,"abstract":"New generations of fast, low-noise CCDs and their controllers are achieving the read-out noise and high frame rates that are critical to the successful completion of true adaptive optics systems. We describe the performance achieved for a variety of systems from those on COAST (Cambridge Optical Aperture Synthesis Telescope), the site evaluation program on the William Herschel Telescope on La Palma, and the results from the latest fast CCDs and new generation of CCD controllers.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"191 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":"123818632","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
Halo Properties and Their Influence on Companion Searches at the Starfire Optical Range 星火星光晕特性及其对伴星搜索的影响
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.atub.3
P. Ryan, J. Angel, D. McCarthy, L. Close, S. Mohanty, R. Fugate, D. Sandler
{"title":"Halo Properties and Their Influence on Companion Searches at the Starfire Optical Range","authors":"P. Ryan, J. Angel, D. McCarthy, L. Close, S. Mohanty, R. Fugate, D. Sandler","doi":"10.1364/adop.1996.atub.3","DOIUrl":"https://doi.org/10.1364/adop.1996.atub.3","url":null,"abstract":"One of the questions which has endured for as long as man has looked at the heavens is ”Are we alone?”. Are there beings on other planets who are also looking into the heavens? The first requirement for alien life similar to our own is that there be planets orbiting other stars. The early stages of planet formation as dictated by theory appear to be robust and several large planets have recently been detected by indirect means[1][2]. Direct imaging is currently being used to search for less ambitious, yet still scientifically interesting faint objects called Brown Dwarfs. The most convincing evidence of a Brown Dwarf, a cross between a star and a planet, was discovered by direct imaging with the aid of a 7.7 arcsecond separation from a companion star[3].","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"300 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":"131604671","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
Development of high QE, fast Avalanche Photodiodes for Astronomical Adaptive Optics 天文自适应光学用高量化、快速雪崩光电二极管的研制
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.tua53
D. Bonaccini, S. Cova, M. Ghioni, F. Zappa, R. Gheser
{"title":"Development of high QE, fast Avalanche Photodiodes for Astronomical Adaptive Optics","authors":"D. Bonaccini, S. Cova, M. Ghioni, F. Zappa, R. Gheser","doi":"10.1364/adop.1995.tua53","DOIUrl":"https://doi.org/10.1364/adop.1995.tua53","url":null,"abstract":"Considering adaptive optics servosystems (AOS) in astronomical applications, a number of error sources have been identified in the wavefront sensor, which provides the reference signal of the servo-loop. These errors impair the system performance, especially with usually faint sources such as Natural Guide Stars (NGS).","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"5 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":"124715818","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
Spatial Light Modulator Structures for Adaptive Optics 自适应光学的空间光调制器结构
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.tha5
C. Woods
{"title":"Spatial Light Modulator Structures for Adaptive Optics","authors":"C. Woods","doi":"10.1364/adop.1995.tha5","DOIUrl":"https://doi.org/10.1364/adop.1995.tha5","url":null,"abstract":"Spatial light modulators have substantially improved in the past few years. Currently, commercial 256 by 256 pixel liquid crystal binary SLMs are available with an operating speed of a millisecond and a pixel spacing of 20 microns for a price of $15,000. Additional improvements in speed by orders of magnitude should be available in the next few years, and micro-mechanical flexure and deformable membrane devices will probably become available.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"77 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":"120867916","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
Digital Filtering Techniques and Centroid Predictors In Ao Servo-Systems Ao伺服系统中的数字滤波技术与质心预测
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1996.athc.26
D. Gallieni, D. Bonaccini
{"title":"Digital Filtering Techniques and Centroid Predictors In Ao Servo-Systems","authors":"D. Gallieni, D. Bonaccini","doi":"10.1364/adop.1996.athc.26","DOIUrl":"https://doi.org/10.1364/adop.1996.athc.26","url":null,"abstract":"Adaptive Optics systems need a wavefront sensor (WFS) for the servo-loop. The WFS integration time has to be selected considering SNR requirements. This requires to extend the integration period as much as possible, especially when dealing with faint sources. On the other hand, WFS sampling period imposes the discretization time-step to the entire servo-system, thus influencing its close loop bandwidth. The latter is also affected by additional time delays caused by WFS readout/reconstructor computing time.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"42 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":"133850044","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
Artificial-Guide-Star Tilt-Anisoplanatism: Its Magnitude and (Limited) Amelioration 人工导星倾斜各向异性:其大小和(有限的)改进
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.wb5
D. Fried
{"title":"Artificial-Guide-Star Tilt-Anisoplanatism: Its Magnitude and (Limited) Amelioration","authors":"D. Fried","doi":"10.1364/adop.1995.wb5","DOIUrl":"https://doi.org/10.1364/adop.1995.wb5","url":null,"abstract":"We shall be concerned here with the problem of tilt anisoplanatism in the use of an artificial-guide-star adaptive optics system in imaging some astronomical object of interest through the turbulent atmosphere. It is well known that because the position of the back scatter region is determined by the direction in which the laser beam was transmitted an artificial-guide-star can not provide any pointing information pertaining to turbulence induced tilt— at least not in any direct manner. (Indirect methods, such as those involving second harmonic generation closely coupled with the back scatter process are being considered but the feasibility of such approaches is still unclear.) If the object of interest is sufficiently bright it can serve as the guide star for correction of turbulence induced tilt—or if there is a sufficiently bright star close enough to the object of interest then it can serve as a natural-guide-star for the correction of turbulence induced tilt. The farther away that natural-guide-star is from the object of interest the greater the discrepancy between the turbulence induced tilt for the object of interest and that for the natural-guide-star, and the lower the Strehl ratio of the image of the object of interest will be—even though the artificial-guide-star may be providing a basis for perfect adaptive optics correction of the higher-order wave front distortion.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"135 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":"134082620","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: 8
Control Loop Analysis and Characterization for an Adaptive Optics Experiment on the Starfire 3.5m Telescope 星火望远镜3.5m自适应光学实验控制回路分析与表征
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.tua37
S. Browne, J. Vaughn, G. Tyler, J. Gonglewski, D. Dayton, S. Sandven, D. Laughlin
{"title":"Control Loop Analysis and Characterization for an Adaptive Optics Experiment on the Starfire 3.5m Telescope","authors":"S. Browne, J. Vaughn, G. Tyler, J. Gonglewski, D. Dayton, S. Sandven, D. Laughlin","doi":"10.1364/adop.1995.tua37","DOIUrl":"https://doi.org/10.1364/adop.1995.tua37","url":null,"abstract":"Au experiment with a nasmyth adaptive optics system mounted on the SOR 3.5m telescope employs an adaptive optical imager. A 148-subaperture hexagonal lenslet array provides a Hartmann wavefront sensor for the 163 actuator mirror to which it is mated. Our analysis of the control loop of the adaptive optical system is edified, and the actual implementation is explained. Performance tradeoffs between various subaperture geometries, based on reconstructor noise gain and stability considerations, are presented. A fast algorithm for measuring Hartmann spot positions is combined with a computationally efficient reconstructor running on a pair of i860XP processors to achieve 1000 reconstructions per second. Moreover, the reconstructor can perform much of its processing on the fly while the frame is being transferred from the pupil plane camera, resulting in significantly reduced servo phase lag. We describe the control loop design, with particular emphasis on the creative use of hardware data paths.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"35 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":"134358534","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
High Accuracy Capacitive Displacement Transducer for the Position Local Control Loops at the Adaptive Secondary 用于自适应二次位置局部控制回路的高精度电容位移传感器
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.tua29
V. Biliotti, R. Biasi, G. Brusa, D. Gallieni, Roberto Spairani, Roberto Aiello
{"title":"High Accuracy Capacitive Displacement Transducer for the Position Local Control Loops at the Adaptive Secondary","authors":"V. Biliotti, R. Biasi, G. Brusa, D. Gallieni, Roberto Spairani, Roberto Aiello","doi":"10.1364/adop.1995.tua29","DOIUrl":"https://doi.org/10.1364/adop.1995.tua29","url":null,"abstract":"The thin faceplate adaptive secondary mirrors are controlled by means of electromagnetic force actuators, which seem to be a suitable choice in terms of stroke, accuracy and cost [Del Vecchio, Gallieni et al.; Biasi, Gallieni et al. in this Conference]. Those actuators need a local control loop to achieve a linear position response. The position sensor is definitely a crucial component of this control loop: both high sensitivity and high speed have to be achieved at same time.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"8 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":"133789456","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: 2
Error reduction in centroid estimates using image intensifiers 使用图像增强器减少质心估计的误差
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.tua51
M. Cagigal, M. G. Portilla, P. Prieto
{"title":"Error reduction in centroid estimates using image intensifiers","authors":"M. Cagigal, M. G. Portilla, P. Prieto","doi":"10.1364/adop.1995.tua51","DOIUrl":"https://doi.org/10.1364/adop.1995.tua51","url":null,"abstract":"To estimate the centroid of a light intensity distribution is a technique widely used in different fields: motion analysis of moving objects from series of frames(1); tracking systems for laser communication(2); resolution improvement by recentering short-exposures images allowing motion removing(3); and adaptive optics, when the wave-front distortion is estimated from the movement of a series of spots produced by an array of lenslet (Hartman-Shack wave-front sensor)(4).","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"48 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":"123509829","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 in Western Europe 西欧的自适应光学
Adaptive Optics Pub Date : 1900-01-01 DOI: 10.1364/adop.1995.tha1
F. Merkle, C. Zeiss
{"title":"Adaptive Optics in Western Europe","authors":"F. Merkle, C. Zeiss","doi":"10.1364/adop.1995.tha1","DOIUrl":"https://doi.org/10.1364/adop.1995.tha1","url":null,"abstract":"In Western Europe in the early seventies, main emphasis was put on high-power laser applications. Later, compensated imaging became the main driver, leading to the first routinely operated adaptive system in astronomy.","PeriodicalId":256393,"journal":{"name":"Adaptive Optics","volume":"31 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":"122401823","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
首页 上一页
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
现在去查看 取消
×
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