Dual-Axis Solar Tracker Design Based on a Digital Hemispherical Imager

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Zakaria El Jaouhari ◽  
Youssef Zaz ◽  
Salah Moughyt ◽  
Omar El Kadmiri ◽  
Zakaria El Kadmiri
Keyword(s):  
Computer Vision ◽  
High Sensitivity ◽  
Field Of View ◽  
Wide Field ◽  
The Sun ◽  
Solar Panels ◽  
Tracking Method ◽  
Wide Field Of View ◽  
Solar Tracker ◽  
Processing Techniques

A design of a solar tracker with a new tracking method based on computer vision techniques is presented in this paper. The proposed method extracts the sun position (orientation θ, elevation φ) in real time from hemispherical sky images using a processing techniques and then drives a pair of motors to move solar panels (or heliostats) toward the sun. To ensure a wide field of view, a camera equipped with a fisheye lens is used to acquire whole sky images. The advantages of such a system are the high sensitivity to brightness compared to traditional photosensors-based trackers. Thus, the system becomes more efficient and able to determine the sun position even during cloudy days. It also operates independently of time and position which makes it reliable in case of mobile solar stations, contrary to systems based on astronomical equations.

scholarly journals Simultaneous voltage and calcium imaging and optogenetic stimulation with high sensitivity and a wide field of view

2019 ◽  
Vol 10 (2) ◽  
pp. 789 ◽  
Author(s):  
Cuong Nguyen ◽  
Hansini Upadhyay ◽  
Michael Murphy ◽  
Gabriel Borja ◽  
Emily J. Rozsahegyi ◽  
...  
Keyword(s):  
Calcium Imaging ◽  
High Sensitivity ◽  
Field Of View ◽  
Wide Field ◽  
Optogenetic Stimulation ◽  
Wide Field Of View

scholarly journals SunCET: The Sun Coronal Ejection Tracker Concept

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.

STM studies of crystal growth

1991 ◽  
Vol 49 ◽  
pp. 374-375
Author(s):  
M. G. Lagally
Keyword(s):  
Crystal Growth ◽  
Molecular Beam ◽  
Chemical Vapor ◽  
Sputter Deposition ◽  
Field Of View ◽  
Scanning Tunneling ◽  
Wide Field ◽  
Tunneling Microscopy ◽  
Wide Field Of View ◽  
The One

It has been recognized since the earliest days of crystal growth that kinetic processes of all Kinds control the nature of the growth. As the technology of crystal growth has become ever more refined, with the advent of such atomistic processes as molecular beam epitaxy, chemical vapor deposition, sputter deposition, and plasma enhanced techniques for the creation of “crystals” as little as one or a few atomic layers thick, multilayer structures, and novel materials combinations, the need to understand the mechanisms controlling the growth process is becoming more critical. Unfortunately, available techniques have not lent themselves well to obtaining a truly microscopic picture of such processes. Because of its atomic resolution on the one hand, and the achievable wide field of view on the other (of the order of micrometers) scanning tunneling microscopy (STM) gives us this opportunity. In this talk, we briefly review the types of growth kinetics measurements that can be made using STM. The use of STM for studies of kinetics is one of the more recent applications of what is itself still a very young field.

Design and verification of high-precision multi-star simulator with a wide field of view

2020 ◽  
Vol 13 (6) ◽  
pp. 1-9
Author(s):  
XU Hong-gang ◽  
◽  
HAN Bing ◽  
LI Man-li ◽  
MA Hong-tao ◽  
...  
Keyword(s):  
High Precision ◽  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View

Fabrication of bioinspired omnidirectional and gapless microlens array for wide field-of-view detections

2012 ◽  
Vol 100 (13) ◽  
pp. 133701 ◽  
Author(s):  
Hewei Liu ◽  
Feng Chen ◽  
Qing Yang ◽  
Pubo Qu ◽  
Shengguan He ◽  
...  
Keyword(s):  
Microlens Array ◽  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View

scholarly journals Wide field-of-view lens-free fluorescent imaging on a chip

Lab on a Chip ◽  
2010 ◽  
Vol 10 (7) ◽  
pp. 824 ◽  
Author(s):  
Ahmet F. Coskun ◽  
Ting-Wei Su ◽  
Aydogan Ozcan
Keyword(s):  
Fluorescent Imaging ◽  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View

scholarly journals Wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces

2018 ◽  
Vol 57 (15) ◽  
pp. 4171 ◽  
Author(s):  
Shingo Kashima ◽  
Masashi Hazumi ◽  
Hiroaki Imada ◽  
Nobuhiko Katayama ◽  
Tomotake Matsumura ◽  
...  
Keyword(s):  
Optical System ◽  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View
Sign in / Sign up

Export Citation Format

Share Document