Research on high-contrast imaging performance of 1.8 m telescope sodium beacon adaptive optical system

2020 ◽  
Vol 49 (8) ◽  
pp. 20200058-20200058
Author(s):  
邓可然 Keran Deng ◽  
魏凯 Kai Wei ◽  
晋凯 Kai Jin ◽  
董若曦 Ruoxi Dong ◽  
李敏 Min Li ◽  
...  
Keyword(s):  
Optical System ◽  
High Contrast ◽  
Contrast Imaging ◽  
Adaptive Optical System ◽  
High Contrast Imaging ◽  
Imaging Performance

Research on high-contrast imaging performance of 1.8 m telescope sodium beacon adaptive optical system

2020 ◽  
Vol 49 (8) ◽  
pp. 20200058-20200058
Author(s):  
邓可然 Keran Deng ◽  
魏凯 Kai Wei ◽  
晋凯 Kai Jin ◽  
董若曦 Ruoxi Dong ◽  
李敏 Min Li ◽  
...  
Keyword(s):  
Optical System ◽  
High Contrast ◽  
Contrast Imaging ◽  
Adaptive Optical System ◽  
High Contrast Imaging ◽  
Imaging Performance

scholarly journals High-fidelity photometry and astrometry of high-contrast imaged companions using LOCI processing.

2013 ◽  
Vol 8 (S299) ◽  
pp. 44-45
Author(s):  
Jérôme Maire ◽  
Jonathan Gagné ◽  
David Lafrenière ◽  
James R. Graham ◽  
René Doyon
Keyword(s):  
Contrast Ratio ◽  
Angular Separation ◽  
Speckle Noise ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
Suppression Technique ◽  
Imaging And Spectroscopy ◽  
And Migration ◽  
Imaging Performance

RésuméDirect imaging and spectroscopy of exoplanets is a key element for understanding planet formation and migration. Such direct detections and characterizations remains technologically challenging, since a very high contrast ratio and small angular separation are involved, and futhermore speckle noise limits the high-contrast imaging performance. We further discuss a speckle subtraction and suppression technique that fully takes advantage of spectral and time-domain information on quasi-static speckles to measure the highest-fidelity photometry as well as accurate astrometry of detected companions.

High-contrast imaging performance of the JWST fine guider sensor tunable filter coronagraph

2004 ◽  
Author(s):  
Rene Doyon ◽  
David LaFreniere ◽  
Neil Rowlands ◽  
Clinton Evans ◽  
Richard Murowinski ◽  
...  
Keyword(s):  
Tunable Filter ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
Imaging Performance

The CM120 Biotwin: a high-contrast objective lens, optimum cryo-vacuum and improved EDX performance

1995 ◽  
Vol 53 ◽  
pp. 584-585
Author(s):  
Uwe Lücken ◽  
Michael Felsmann ◽  
Wim M. Busing ◽  
Frank de Jong
Keyword(s):  
Life Science ◽  
Focal Length ◽  
Objective Lens ◽  
High Contrast ◽  
Contrast Imaging ◽  
X Ray ◽  
Forming Mechanism ◽  
Similar Image ◽  
High Contrast Imaging ◽  
Low Concentrations

A new microscope for the study of life science specimen has been developed. Special attention has been given to the problems of unstained samples, cryo-specimens and x-ray analysis at low concentrations.A new objective lens with a Cs of 6.2 mm and a focal length of 5.9 mm for high-contrast imaging has been developed. The contrast of a TWIN lens (f = 2.8 mm, Cs = 2 mm) and the BioTWTN are compared at the level of mean and SD of slow scan CCD images. Figure 1a shows 500 +/- 150 and Fig. 1b only 500 +/- 40 counts/pixel. The contrast-forming mechanism for amplitude contrast is dependent on the wavelength, the objective aperture and the focal length. For similar image conditions (same voltage, same objective aperture) the BioTWIN shows more than double the contrast of the TWIN lens. For phasecontrast specimens (like thin frozen-hydrated films) the contrast at Scherzer focus is approximately proportional to the √ Cs.

scholarly journals Anti-quenching NIR-II molecular fluorophores for in vivo high-contrast imaging and pH sensing

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Shangfeng Wang ◽  
Yong Fan ◽  
Dandan Li ◽  
Caixia Sun ◽  
Zuhai Lei ◽  
...  
Keyword(s):  
Ph Sensing ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging
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