Optimization of spectral channel of transfer radiometer

2017 ◽  
Vol 25 (9) ◽  
pp. 2259-2267 ◽  
Author(s):  
孙立微 SUN Li-wei ◽  
叶 新 YE Xin ◽  
王玉鹏 WANG Yu-peng ◽  
方 伟 FANG Wei
Keyword(s):  
Spectral Channel

scholarly journals Missing flux in VLBI observations of SiO maser at 7 mm in IRC+10011

2017 ◽  
Vol 13 (S336) ◽  
pp. 387-388
Author(s):  
J.-F. Desmurs ◽  
J. Alcolea ◽  
V. Bujarrabal ◽  
F. Colomer ◽  
R. Soria-Ruiz
Keyword(s):  
Dynamic Range ◽  
High Sensitivity ◽  
High Dynamic Range ◽  
Total Flux ◽  
Agb Stars ◽  
Maser Emission ◽  
Spectral Channel ◽  
Emission Area ◽  
Vlbi Observations ◽  
High Dynamic

AbstractVLBI observations of SiO masers recover at most 40-50% of the total flux obtained by single dish observations at any spectral channel. Some previous studies seems to indicate that, at least, part of the lost flux is divided up into many weak components rather than in a large resolved emission area. Taking benefit of the high sensitivity and resolution of the HSA, we investigate the problem of the missing flux in VLBI observations of SiO maser emission at 7 mm in the AGB stars and obtain a high dynamic range map of IRC+10011. We conclude that the missing flux is mostly contained in many very weak maser components.

scholarly journals CIRRUS REMOVAL IN MULTISPECTRAL DATAWITHOUT 1.38μM SPECTRAL DATA

2016 ◽  
Vol III-7 ◽  
pp. 41-44
Author(s):  
Aliaksei Makarau ◽  
Rudolf Richter ◽  
Viktoria Zekoll ◽  
Peter Reinartz
Keyword(s):  
Additive Model ◽  
Optical Data ◽  
Landsat 8 ◽  
Cirrus Cloud ◽  
Landsat 8 Oli ◽  
Spectral Channel ◽  
Wide Range ◽  
Low Altitude ◽  
Spectral Channels ◽  
Sentinel 2

Cirrus is one of the most common artifacts in the remotely sensed optical data. Contrary to the low altitude (1-3 km) cloud the cirrus cloud (8-20 km) is semitransparent and the extinction (cirrus influence) of the upward reflected solar radiance can be compensated. The widely employed and almost ’de-facto’ method for cirrus compensation is based on the 1.38μm spectral channel measuring the upwelling radiance reflected by the cirrus cloud. The knowledge on the cirrus spatial distribution allows to estimate the per spectral channel cirrus attenuation and to compensate the spectral channels. A wide range of existing and expected sensors have no 1.38μm spectral channel. These sensors data can be corrected by the recently developed haze/cirrus removal method. The additive model of the estimated cirrus thickness map (CTM) is applicable for cirrus-conditioned extinction compensation. Numeric and statistic evaluation of the CTM-based cirrus removal on more than 80 Landsat-8 OLI and 30 Sentinel-2 scenes demonstrates a close agreement with the 1.38μm channel based cirrus removal.

THE CLASSIC/CLIMB BEAM COMBINER AT THE CHARA ARRAY

2013 ◽  
Vol 02 (02) ◽  
pp. 1340004 ◽  
Author(s):  
T. A. TEN BRUMMELAAR ◽  
J. STURMANN ◽  
S. T. RIDGWAY ◽  
L. STURMANN ◽  
N. H. TURNER ◽  
...  
Keyword(s):  
Scientific Program ◽  
Wide Bandwidth ◽  
Phase Measurements ◽  
Spectral Channel ◽  
Beam Combiner ◽  
Chara Array

In the same way that every telescope has multiple instruments and cameras, an interferometric array like the CHARA Array will have numerous beam combiners at the back end. And like the instruments of a single telescope, each of these combiners will be optimized for a particular kind of observation or scientific program. In this paper we describe the CLASSIC and CLIMB beam combiners of the CHARA Array. Both are open air, aperture plane, wide bandwidth single spectral channel instruments optimized for sensitivity. CLASSIC is the original two beam combiner used for the first science at CHARA, and it still has the faintest magnitude limit. CLIMB is a three beam expansion of CLASSIC that can also provide closure phase measurements.

Analysis of Spectral Channel Bandwidth of Monocular Multispectral Passive Ranging System Based on Oxygen Absorption

2018 ◽  
Vol 38 (6) ◽  
pp. 0601003
Author(s):  
闫宗群 Yan Zongqun ◽  
杨建昌 Yang Jianchang ◽  
张瑜 Zhang Yu ◽  
谢志宏 Xie Zhihong ◽  
陈剑 Chan Jian
Keyword(s):  
Oxygen Absorption ◽  
Spectral Channel ◽  
Passive Ranging ◽  
Channel Bandwidth

scholarly journals CIRRUS REMOVAL IN MULTISPECTRAL DATAWITHOUT 1.38μM SPECTRAL DATA

2016 ◽  
Vol III-7 ◽  
pp. 41-44
Author(s):  
Aliaksei Makarau ◽  
Rudolf Richter ◽  
Viktoria Zekoll ◽  
Peter Reinartz
Keyword(s):  
Additive Model ◽  
Optical Data ◽  
Landsat 8 ◽  
Cirrus Cloud ◽  
Landsat 8 Oli ◽  
Spectral Channel ◽  
Wide Range ◽  
Low Altitude ◽  
Spectral Channels ◽  
Sentinel 2

Cirrus is one of the most common artifacts in the remotely sensed optical data. Contrary to the low altitude (1-3 km) cloud the cirrus cloud (8-20 km) is semitransparent and the extinction (cirrus influence) of the upward reflected solar radiance can be compensated. The widely employed and almost ’de-facto’ method for cirrus compensation is based on the 1.38μm spectral channel measuring the upwelling radiance reflected by the cirrus cloud. The knowledge on the cirrus spatial distribution allows to estimate the per spectral channel cirrus attenuation and to compensate the spectral channels. A wide range of existing and expected sensors have no 1.38μm spectral channel. These sensors data can be corrected by the recently developed haze/cirrus removal method. The additive model of the estimated cirrus thickness map (CTM) is applicable for cirrus-conditioned extinction compensation. Numeric and statistic evaluation of the CTM-based cirrus removal on more than 80 Landsat-8 OLI and 30 Sentinel-2 scenes demonstrates a close agreement with the 1.38μm channel based cirrus removal.

Design of a multi-spectral channel for in vivo confocal microscopy

2007 ◽  
Author(s):  
Houssine Makhlouf ◽  
Anthony A. Tanbakuchi ◽  
Andrew R. Rouse ◽  
Arthur F. Gmitro
Keyword(s):  
Confocal Microscopy ◽  
In Vivo Confocal Microscopy ◽  
Spectral Channel
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