scholarly journals A Multi-Frequency VLBI Polarization Study of the CSS Quasar 3C 309.1

1998 ◽  
Vol 164 ◽  
pp. 105-106
Author(s):  
Scott E. Aaron ◽  
John F.C. Wardle ◽  
David H. Roberts
Keyword(s):  
Radio Source ◽  
Dynamic Range ◽  
Ambient Medium ◽  
High Dynamic Range ◽  
Field Of View ◽  
Large Field ◽  
General Properties ◽  
Polarization Study ◽  
Rotation Measure ◽  
High Dynamic

AbstractWe discuss the rotation measure properties of the CSS quasar 3C 309.1, determined from high dynamic range, large field of view VLBA images at several frequencies between 1.4 and 15 GHz. We consider the general properties of the ambient medium by considering the structure of the Faraday screen across various parts of the radio source.

scholarly journals Non-Intrusive Luminance Mapping via High Dynamic Range Imaging and 3-D Reconstruction

2021 ◽  
Vol 2042 (1) ◽  
pp. 012113
Author(s):  
Michael Kim ◽  
Athanasios Tzempelikos
Keyword(s):  
Dynamic Range ◽  
Low Cost ◽  
High Dynamic Range ◽  
Field Of View ◽  
High Dynamic Range Imaging ◽  
3D Space ◽  
Short Video ◽  
High Dynamic ◽  
Daylighting Control ◽  
Good Agreement

Abstract Continuous luminance monitoring is challenging because high-dynamic-range cameras are expensive, they need programming, and are intrusive when placed near the occupants’ field-of-view. A new semi-automated and non-intrusive framework is presented for monitoring occupant-perceived luminance using a low-cost camera sensor and Structure-from- Motion (SfM)-Multiview Stereo (MVS) photogrammetry pipeline. Using a short video and a few photos from the occupant position, the 3D space geometry is automatically reconstructed. Retrieved 3D context enables the back-projection of the camera-captured luminance distribution into 3D spaces that are in turn re-projected to occupant-FOVs. The framework was tested and validated in a testbed office. The re-projected luminance field showed with good agreement with luminance measured at the occupant position. The new method can be used for non-intrusive luminance monitoring integrated with daylighting control applications.

High Dynamic Range Mapping of a Complex Radio Source — M87

1988 ◽  
pp. 131-132 ◽  
Author(s):  
T. W. B. Muxlow ◽  
W. Junor ◽  
R. E. Spencer ◽  
R. Simon ◽  
J. Benson ◽  
...  
Keyword(s):  
Radio Source ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
High Dynamic

Australian SKA Pathfinder: A High-Dynamic Range Wide-Field of View Survey Telescope

2009 ◽  
Vol 97 (8) ◽  
pp. 1507-1521 ◽  
Author(s):  
David R. DeBoer ◽  
Russell G. Gough ◽  
John D. Bunton ◽  
Tim J. Cornwell ◽  
Ron J. Beresford ◽  
...  
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View ◽  
High Dynamic

Gaze and discomfort glare, Part 1: Development of a gaze-driven photometry

2016 ◽  
Vol 49 (7) ◽  
pp. 845-865 ◽  
Author(s):  
M Sarey Khanie ◽  
J Stoll ◽  
W Einhäuser ◽  
J Wienold ◽  
M Andersen
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Subjective Assessment ◽  
Field Of View ◽  
High Dynamic Range Imaging ◽  
Range Imaging ◽  
Significant Difference ◽  
Discomfort Glare ◽  
Series Of Experiments ◽  
High Dynamic

Discomfort glare is a major challenge for the design of workplaces. The existing metrics for discomfort glare prediction share the limitation that they do not take gaze direction into account. To overcome this limitation, we developed a ‘gaze-driven’ method for discomfort glare assessment. We conducted a series of experiments under simulated office conditions and recorded the participants’ gaze using mobile eye tracking and the luminance distributions using high dynamic range imaging methods. The two methods were then integrated to derive ‘gaze-centred’ luminance measurements in the field of view. The existing ‘fixed-gaze’ and the newly developed ‘gaze-driven’ measurement methods are compared. Our results show that there is a significant difference between the two methods. In this paper, the procedure for integrating the recorded luminance images with the recorded gaze dynamics for obtaining gaze-centred luminance data is described. This gaze-centred luminance data will be compared to the subjective assessment of glare in Part 2 of this study.

scholarly journals High Dynamic Range Mapping of a Complex Radio Source – M87

1988 ◽  
Vol 129 ◽  
pp. 131-132 ◽  
Author(s):  
T.W.B. Muxlow ◽  
W. Junor ◽  
R.E. Spencer ◽  
R. Simon ◽  
J. Benson ◽  
...  
Keyword(s):  
High Resolution ◽  
Radio Source ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Entire Length ◽  
High Dynamic ◽  
Made In

The well known jet in M87 (Virgo A) has been extensively studied in the radio regime using conventional arrays with resultant resolutions in the range 0.22–1 arcsecond. We present here the results of a VLBI experiment to map the jet over its entire length (30 arcseconds) to high resolution. The observations were made in April 1984 at 1.67 GHz with a ‘World Array’ containing 18 VLBI telescopes. In addition, simultaneous observations were performed with the 6 station MERLIN array.

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.

High-dynamic-range interferometric bragg-cell spectrum analyser

1986 ◽  
Vol 133 (1) ◽  
pp. 26
Author(s):  
J. Mellis ◽  
G.R. Adams ◽  
K.D. Ward
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Spectrum Analyser ◽  
High Dynamic
Sign in / Sign up

Export Citation Format

Share Document