Viewing angle dependence of speckle contrast ratio in laser projection system

2015 ◽  
Author(s):  
Qianli Ma ◽  
ChangQing Xu ◽  
Hai Ming
Keyword(s):  
Contrast Ratio ◽  
Viewing Angle ◽  
Projection System ◽  
Speckle Contrast ◽  
Angle Dependence

Suppression of viewing angle dependence of TEOLED devices with internal nano-wrinkle structure

2020 ◽  
Vol 77 ◽  
pp. 105493
Author(s):  
Min Chul Suh ◽  
Dae Yeong Kim ◽  
Seon Hyeak Jung ◽  
Nam Su Kim
Keyword(s):  
Viewing Angle ◽  
Angle Dependence

How to Make Large Screen Displays Legible

1981 ◽  
Vol 25 (1) ◽  
pp. 149-153
Author(s):  
Donald A. Shurtleff ◽  
William F. Wuersch ◽  
James G. Rogers
Keyword(s):  
Central Composite Design ◽  
Contrast Ratio ◽  
Adaptation Level ◽  
Viewing Angle ◽  
Evaluation Tool ◽  
Large Screen ◽  
Visual Size ◽  
Main Effects ◽  
Central Composite

Four major display variables, luminance adaptation level, symbol contrast ratio, symbol visual size and off-axis viewing angle, were related, in a rotatable central composite design, to an observer's ability to identify symbols shown on a large screen display (LSD). The results show the nature and significance of all main effects as well as delineate the important interactions among these variables. The results can be used as an LSD design and evaluation tool permitting tradeoffs to be made among the important features of display equipment, projection screens and viewing facilities.

Orientations and viewing angle dependence of twisted ferroelectric liquid crystal

1996 ◽  
Vol 179 (1) ◽  
pp. 173-180 ◽  
Author(s):  
Kohki Takatoh ◽  
Hiroyuki Nagata ◽  
Tatsuo Saishu
Keyword(s):  
Liquid Crystal ◽  
Ferroelectric Liquid Crystal ◽  
Viewing Angle ◽  
Angle Dependence

scholarly journals Characterisation of a stratospheric sulfate plume from the Nabro volcano using a combination of passive satellite measurements in nadir and limb geometry

2014 ◽  
Vol 14 (15) ◽  
pp. 8149-8163 ◽  
Author(s):  
M. J. M. Penning de Vries ◽  
S. Dörner ◽  
J. Puķīte ◽  
C. Hörmann ◽  
M. D. Fromm ◽  
...  
Keyword(s):  
Lower Stratosphere ◽  
Single Scattering ◽  
Sulfate Aerosols ◽  
Viewing Angle ◽  
Satellite Measurements ◽  
Lower Altitude ◽  
Angle Dependence ◽  
Ground Based Lidar ◽  
Aerosol Index ◽  
Aerosol Plume

Abstract. The eruption of the Nabro volcano (Eritrea), which started on 12 June 2011, caused the introduction of large quantities of SO2 into the lower stratosphere. The subsequently formed sulfate aerosols could be detected for several months following the eruption. It is generally assumed that the formation of sulfate aerosols in the stratosphere is a relatively slow process, but in plumes from explosive eruptions significant amounts of aerosols have been seen to form within a few hours. We show that sulfate aerosols were present in the lower stratosphere within hours of the onset of the eruption of Nabro. Evidence comes from nadir UV Aerosol Index (UVAI) and SO2 measurements by SCIAMACHY, GOME-2 and OMI, and limb aerosol measurements by SCIAMACHY. The sulfate plume displays negative UVAI in the western part of OMI's swath and positive UVAI in the eastern part – an effect that is due to the strong viewing angle dependence of UVAI and can only be caused by a high-altitude (>11 km), non-absorbing (single-scattering albedo >0.97) aerosol plume. For the retrieval of the aerosol profile from limb measurements, the horizontal dimensions and the position of the aerosol plume need to be taken into account, otherwise both extinction and layer height may be underestimated appreciably. By combining nadir SO2 column density and UVAI with limb aerosol profiles, a stratospheric plume from Nabro could be tracked from 13 to 17 June, before the plumes from later, lower-altitude explosions started interfering with the signal. Our findings are in agreement with ground-based lidar and sun-photometer data from an MPLNET/AERONET station in Israel and with data from the satellite-borne CALIOP lidar.

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