Active THz imaging system with improved frame rate

2009 ◽  
Author(s):  
W. von Spiegel ◽  
C. am Weg ◽  
R. Henneberger ◽  
R. Zimmermann ◽  
T. Loeffler ◽  
...  
Keyword(s):  
Imaging System ◽  
Frame Rate ◽  
Thz Imaging

scholarly journals Bionic Birdlike Imaging Using a Multi-Hyperuniform LED Array

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4084
Author(s):  
Xin-Yu Zhao ◽  
Li-Jing Li ◽  
Lei Cao ◽  
Ming-Jie Sun
Keyword(s):  
Imaging System ◽  
Color Image ◽  
Digital Camera ◽  
Frame Rate ◽  
Digital Cameras ◽  
Structured Illumination ◽  
Pixel Resolution ◽  
Led Array ◽  
Frequency Aliasing ◽  
Imaging Sensors

Digital cameras obtain color information of the scene using a chromatic filter, usually a Bayer filter, overlaid on a pixelated detector. However, the periodic arrangement of both the filter array and the detector array introduces frequency aliasing in sampling and color misregistration during demosaicking process which causes degradation of image quality. Inspired by the biological structure of the avian retinas, we developed a chromatic LED array which has a geometric arrangement of multi-hyperuniformity, which exhibits an irregularity on small-length scales but a quasi-uniformity on large scales, to suppress frequency aliasing and color misregistration in full color image retrieval. Experiments were performed with a single-pixel imaging system using the multi-hyperuniform chromatic LED array to provide structured illumination, and 208 fps frame rate was achieved at 32 × 32 pixel resolution. By comparing the experimental results with the images captured with a conventional digital camera, it has been demonstrated that the proposed imaging system forms images with less chromatic moiré patterns and color misregistration artifacts. The concept proposed verified here could provide insights for the design and the manufacturing of future bionic imaging sensors.

scholarly journals BWO based THz imaging system

2014 ◽  
Vol 486 ◽  
pp. 012027 ◽  
Author(s):  
Artem N Perov ◽  
Kirill I Zaytsev ◽  
Irina N Fokina ◽  
Valeriy E Karasik ◽  
Egor V Yakovlev ◽  
...  
Keyword(s):  
Imaging System ◽  
Thz Imaging

scholarly journals A Hybrid THz Imaging System With a 100-Pixel CMOS Imager and a 3.25–3.50 THz Quantum Cascade Laser Frequency Comb

2019 ◽  
Vol 2 (9) ◽  
pp. 151-154 ◽  
Author(s):  
T. J. Smith ◽  
Anna Broome ◽  
Daniel Stanley ◽  
Jonas Westberg ◽  
Gerard Wysocki ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Imaging System ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Thz Imaging ◽  
Quantum Cascade ◽  
Cmos Imager

Nucleate Boiling From Micro-Machined Surfaces

2003 ◽  
Author(s):  
Adrian M. Holland ◽  
Colin P. Garner
Keyword(s):  
Heat Transfer ◽  
High Speed ◽  
Imaging System ◽  
Laser System ◽  
Ccd Camera ◽  
Nucleate Boiling ◽  
Heat Fluxes ◽  
Frame Rate ◽  
High Speed Imaging ◽  
Machined Surfaces

This paper discusses the production and use of laser-machined surfaces that provide enhanced nucleate boiling and heat transfer characteristics. The surface features of heated plates are known to have a significant effect on nucleate boiling heat transfer and bubble growth dynamics. Nucleate boiling starts from discrete bubbles that form on surface imperfections, such as cavities or scratches. The gas or vapours trapped in these imperfections serve as nuclei for the bubbles. After inception, the bubbles grow to a certain size and depart from the surface. In this work, special heated surfaces were manufactured by laser machining cavities into polished aluminium plates. This was accomplished with a Nd:YAG laser system, which allowed drilling of cavities of a known diameter. The size range of cavities was 20 to 250 micrometers. The resulting nucleate pool boiling was analysed using a novel high-speed imaging system comprising an infrared laser and high resolution CCD camera. This system was operated up to a 2 kHz frame rate and digital image processing allowed bubbles to be analysed statistically in terms of departure diameter, departure frequency, growth rate, shape and velocity. Data was obtained for heat fluxes up to 60 kW.m−2. Bubble measurements were obtained working with water at atmospheric pressure. The surface cavity diameters were selected to control the temperature at which vapour bubbles started to grow on the surface. The selected size and spacing of the cavities was also explored to provide optimal heat transfer.

Design and construction of a high frame rate imaging system

2002 ◽  
Vol 111 (5) ◽  
pp. 2484
Author(s):  
Jing Wang ◽  
John L. Waugaman ◽  
Anjun Liu ◽  
Jian-yu Lu
Keyword(s):  
Imaging System ◽  
Frame Rate ◽  
High Frame Rate ◽  
Design And Construction
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