DAYLIGHT GLARE PROBABILITY PREDICTION FOR AN OFFICE ROOM

Glare assessments are currently made from High Dynamic Range (HDR) images taken from the Point Of View (POV) and viewing direction of a user. This paper analyses the feasibility to estimate the Daylight Glare Probability (DGP) at the user-level based on machine-learning techniques, sun position and a downward-pointing camera sensor mounted at the ceiling of a simulated office environment. Three different office cases have been considered: an empty room, an empty room with venetian blinds and a furnished room without venetian blinds. The influence of the sun direction has been considered as a parameter to predict the observer DGP. Subsequently, the best parameters have been selected to build a black box model using Artificial Intelligence (AI). Results show that, by using the DGP of the ceiling camera and the sun position, it is possible to accurately predict the DGP for an observer’s POV.

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A low-noise, high-dynamic-range, digital receiver for radio astronomy applications: an efficient solution for observing radio-bursts from Jupiter, the Sun, pulsars, and other astrophysical plasmas below 30 MHz

Astronomy and Astrophysics ◽

10.1051/0004-6361/200913335 ◽

2010 ◽

Vol 510 ◽

pp. A16 ◽

Cited By ~ 53

Author(s):

V. B. Ryabov ◽

D. M. Vavriv ◽

P. Zarka ◽

B. P. Ryabov ◽

R. Kozhin ◽

...

Keyword(s):

Radio Astronomy ◽

Efficient Solution ◽

Dynamic Range ◽

High Dynamic Range ◽

Low Noise ◽

The Sun ◽

Radio Bursts ◽

Digital Receiver ◽

Astrophysical Plasmas ◽

High Dynamic

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The Sun at the VLA's Metric and Decimetric Wavelengths

Symposium - International Astronomical Union ◽

10.1017/s0074180900088586 ◽

1990 ◽

Vol 142 ◽

pp. 523-524

Author(s):

S. M. White ◽

M. R. Kundu ◽

N. Gopalswamy ◽

E. J. Schmahl

Keyword(s):

Large Scale ◽

Dynamic Range ◽

Active Regions ◽

High Dynamic Range ◽

The Sun ◽

Large Array ◽

Very Large Array ◽

Preliminary Results ◽

High Dynamic ◽

Coronal Structures

During September 1988 (International Solar Month) we observed the Sun with the Very Large Array on 4 days in the period Sep. 11-17. The VLA was in its most compact configuration, which is ideal for studying large-scale coronal structures. Here we summarize some preliminary results of the observations at 0.333 and 1.5 GHz. Despite the presence of numerous active regions the Sun was actually very quiet, with no flares during our observing, and this allowed us to make high-dynamic-range maps.

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Using High Dynamic Range Photogrammetry for Luminance Mapping of the Sky and the Sun

AEI 2015 ◽

10.1061/9780784479070.029 ◽

2015 ◽

Author(s):

Hongyi Cai

Keyword(s):

Dynamic Range ◽

High Dynamic Range ◽

The Sun ◽

High Dynamic

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OPTIMIZING CAMERA PLACEMENT FOR A LUMINANCE-BASED SHADING CONTROL SYSTEM

10.25039/x48.2021.po39 ◽

2021 ◽

Author(s):

A. Mentens ◽

G.H. Scheir ◽

Y. Ghysel ◽

F. Descamps ◽

J. Lataire ◽

...

Keyword(s):

Dynamic Range ◽

Control Strategies ◽

Low Cost ◽

Weather Conditions ◽

High Dynamic Range ◽

Machine Learning Techniques ◽

Learning Techniques ◽

Shading Control ◽

Office Environments ◽

Future Work

Shading control strategies are nowadays employed in office environments to improve the visual comfort of the user. These strategies are often solely illuminance-based whereas comfort metrics as the Daylight Glare Probability (DGP) also need luminance values. In previous studies, daylight glare has been assessed by calculating the DGP from luminance maps obtained via a luminance camera or from a High Dynamic Range (HDR) image obtained with a commercially available camera. These detectors are traditionally mounted close to the user and aligned with the viewing direction. In real office environments, this camera position is impractical, and simulations based on machine learning techniques have shown a relation between the DGP from an observer's viewpoint and the DGP calculated from a ceiling camera. This paper experimentally validates this method in a real office environment by using two different cameras and two different illuminance sensors, i.e., a low-cost illuminance sensor and a calibrated sensor. Both cameras render similar results, although one camera overestimates the DGP. Moreover, the shortcomings of the simulation results are pinpointed and the obstacles for a realistic application are addressed. Furthermore, it was found that when moving the cameras to different positions, the sun position was shown to be an informative additional input for correlating the two DGP values. In future work, additional data will be analysed to determine the performance in other weather conditions and window orientations.

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SunCET: The Sun Coronal Ejection Tracker Concept

Journal of Space Weather and Space Climate ◽

10.1051/swsc/2021004 ◽

2021 ◽

Author(s):

James Paul Mason ◽

Phillip C Chamberlin ◽

Daniel Seaton ◽

Joan Burkepile ◽

Robin Colaninno ◽

...

Keyword(s):

Dynamic Range ◽

Extreme Ultraviolet ◽

High Dynamic Range ◽

Field Of View ◽

Integration Time ◽

Wide Field ◽

The Sun ◽

Wide Field Of View ◽

High Dynamic ◽

Short Integration Time

The Sun Coronal Ejection Tracker (SunCET) is an extreme ultraviolet imager and spectrograph instrument concept for tracking coronal mass ejections through the region where they experience the majority of their acceration: the difficult-to-observe middle corona. It contains a wide field of view (0--4~\Rs) imager and a 1~\AA\ spectral-resolution-irradiance spectrograph spanning 170--340~\AA. It leverages new detector technology to read out different areas of the detector with different integration times, resulting in what we call ``simultaneous high dynamic range", as opposed to the traditional high dynamic range camera technique of subsequent full-frame images that are then combined in post-processing. This allows us to image the bright solar disk with short integration time, the middle corona with a long integration time, and the spectra with their own, independent integration time. Thus, SunCET does not require the use of an opaque or filtered occulter. SunCET is also compact --- $\sim$15 $\times$ 15 $\times$ 10~cm in volume --- making it an ideal instrument for a CubeSat or a small, complimentary addition to a larger mission.

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