Characteristics of the Eastern Interconnection Line Frequency

1982 ◽  
Vol PER-2 (12) ◽  
pp. 37-37
Author(s):  
R. K. Adams ◽  
J. M. McIntyre ◽  
F. W. Symonds
Keyword(s):  
Line Frequency

scholarly journals Common-Mode Voltage Reduction in Capacitive Sensing of Biosignal Using Capacitive Grounding and DRL Electrode

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2568
Author(s):  
Tadeas Bednar ◽  
Branko Babusiak ◽  
Michal Labuda ◽  
Milan Smetana ◽  
Stefan Borik
Keyword(s):  
Noise Removal ◽  
Power Line ◽  
Measured Signal ◽  
Common Mode ◽  
Line Frequency ◽  
Electrode Area ◽  
Common Mode Voltage ◽  
Grounding Electrode ◽  
Power Line Noise ◽  
Line Noise

A capacitive measurement of the biosignals is a very comfortable and unobtrusive way suitable for long-term and wearable monitoring of health conditions. This type of sensing is very susceptible to noise from the surroundings. One of the main noise sources is power-line noise, which acts as a common-mode voltage at the input terminals of the acquisition unit. The origin and methods of noise reduction are described on electric models. Two methods of noise removal are modeled and experimentally verified in the paper. The first method uses a passive capacitive grounding electrode, and the second uses an active capacitive Driven Right Leg (DRL) electrode. The effect of grounding electrode size on noise suppression is experimentally investigated. The increasing electrode area reduces power-line noise: the power of power-line frequency within the measured signal is 70.96 dB, 59.13 dB, and 43.44 dB for a grounding electrode area of 1650 cm2, 3300 cm2, and 4950 cm2, respectively. The capacitive DRL electrode shows better efficiency in common-mode noise rejection than the grounding electrode. When using an electrode area of 1650 cm2, the DRL achieved 46.3 dB better attenuation than the grounding electrode at power-line frequency. In contrast to the grounding electrode, the DRL electrode reduces a capacitive measurement system’s financial costs due to the smaller electrode area made of the costly conductive textile.

Mosaiced and high line frequency VPH gratings for astronomy

2004 ◽  
Author(s):  
Pierre-Alexandre Blanche ◽  
Patrick Gailly ◽  
Serge Habraken ◽  
Philippe Lemaire ◽  
Claude Jamar
Keyword(s):  
Line Frequency ◽  
High Line

Vibration cancellation apparatus with line frequency components

1995 ◽  
Vol 98 (4) ◽  
pp. 1835-1835
Author(s):  
Richard F. Guardiani ◽  
Thomas L. Geiger
Keyword(s):  
Line Frequency ◽  
Frequency Components
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