MMW/THz imaging using upconversion to visible, based on glow discharge detector array and CCD camera

2017 ◽  
Author(s):  
Natan S. Kopeika ◽  
Yitzhak Yitzhaky ◽  
Avihai Aharon Akram ◽  
Amir Abramovich ◽  
Daniel Rozban
Keyword(s):  
Glow Discharge ◽  
Ccd Camera ◽  
Detector Array ◽  
Thz Imaging ◽  
Glow Discharge Detector

THz imaging using Glow Discharge Detector (GDD) focal plane arrays and large aperture quasi optic mirrors

2010 ◽  
Author(s):  
N. S. Kopeika ◽  
A. Abramovich ◽  
H. Joseph ◽  
D. Rozban ◽  
A. Akram ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Focal Plane ◽  
Focal Plane Arrays ◽  
Thz Imaging ◽  
Large Aperture ◽  
Glow Discharge Detector

scholarly journals Performance Enhancement of Inexpensive Glow Discharge Detector Operating in Up-Conversion Mode in Millimeter Wave Detection for Focal Plane Arrays

2021 ◽  
Vol 11 (20) ◽  
pp. 9564
Author(s):  
Arun Ramachandra Kurup ◽  
Daniel Rozban ◽  
Lidor Kahana ◽  
Amir Abramovich ◽  
Yitzhak Yitzhaky ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Millimeter Wave ◽  
Performance Enhancement ◽  
Signal To Noise Ratio ◽  
Focal Plane Arrays ◽  
Imaging Systems ◽  
Pass Filter ◽  
Detailed Derivation ◽  
Glow Discharge Detector ◽  
Thz Sensor

Performance enhancement of a very inexpensive millimeter-wave (MMW)/terahertz (THz) sensor for MMW/THz imaging systems is experimentally demonstrated in this study. The MMW sensor is composed of a glow discharge detector (GDD) and a light-to-frequency (LTF) converter combination. The experimental results given in this study show an improvement in the performance parameters of the detector element, such as the minimum detectable signal, as well as the signal to noise ratio (SNR) and the noise equivalent power (NEP), when a NIR long-pass filter was inserted between the GDD and the LTF combination. A detailed derivation of the NEP of this unique sensor is presented in this work. Based on this derivation and the experimental measurements, the NEP value was calculated.

scholarly journals A Search for Variable Stars at the Galactic Center

1989 ◽  
Vol 136 ◽  
pp. 487-492 ◽  
Author(s):  
Joseph W. Haller ◽  
Marcia J. Rieke
Keyword(s):  
Stellar Population ◽  
Galactic Center ◽  
Ccd Camera ◽  
Variable Stars ◽  
Detector Array ◽  
High Luminosity ◽  
Bolometric Luminosity ◽  
Long Period ◽  
Long Period Variables ◽  
K 13

A study of the Galactic Center stellar population is continuing with a sensitive 2μm CCD camera. Using a 64 × 64 detector array, background limited images are recorded with modest amounts of observing time (tobs ≈ 20 sec to reach K=13). Magnitudes have been extracted using DAOPHOT from repeated imaging of the central 5′ × 5′ to search among approximately 1500 stars for long period variables (LPV's, P > 200d), particularily Miras. Miras have a well defined period-luminosity relationship as well as one in period-mass. This program investigates the nature of highly luminous stars at the Galactic Center. Presently 12 variables have been found and have several characteristics consistent with Miras. They have a maximum bolometric luminosity of −4.4 mag, which supports the case that high luminosity stars in the central 6 pc are young supergiants.

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