Coherent, infrared, heterodyne detection systems

1996 ◽  
Author(s):  
M. Strzelec
Keyword(s):  
Heterodyne Detection ◽  
Detection Systems

Selected subassemblies of infrared heterodyne detection systems

1997 ◽  
Author(s):  
Marek Strzelec ◽  
Zbigniew Puzewicz ◽  
Miroslaw Kopica
Keyword(s):  
Heterodyne Detection ◽  
Detection Systems

scholarly journals Development of a correlation ECE radiometer for electron temperature fluctuation measurements in Heliotron J

2019 ◽  
Vol 203 ◽  
pp. 03013
Author(s):  
Gavin M. Weir ◽  
Kazunobu Nagasaki ◽  
Jinxiang Zhu ◽  
Maoyuan Luo ◽  
Hiroyuki Okada ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuation ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Intermediate Frequency ◽  
Local Oscillator ◽  
Heterodyne Detection ◽  
Helical Axis ◽  
Detection Systems ◽  
Heating Radiation

A radial correlation ECE radiometer diagnostic has been developed for electron temperature fluctuation measurements in the helical-axis heliotron device, Heliotron J. The radiometer consists of two heterodyne detection systems. One system scans the frequency of a local oscillator from 52 to 64 GHz with a single intermediate frequency filter, and the second system has a fixed frequency, 56 GHz local oscillator with four intermediate frequency filters. This frequency range covers measurement positions spanning from the plasma core to the half radius. Laboratory tests indicate that each system has narrow intermediate frequency bandwidth and high-sensitivity over a large dynamic range. During plasma experiments with NBI heating, radiation temperature fluctuation measured by the CECE radiometer decrease with increasing ECCD commensurate with previous measurements of energetic particle driven modes on Heliotron J.

Applications of infrared heterodyne detection systems

1998 ◽  
Author(s):  
Marek Strzelec ◽  
Zbigniew Puzewicz ◽  
Miroslaw Kopica
Keyword(s):  
Heterodyne Detection ◽  
Detection Systems
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