Improved capacitive sensor used to detect presence and/or measure thickness of layer of liquid. Electrical impedance or admittance of sensor measured at prescribed frequency, and thickness of liquid inferred from predetermined theoretical or experimental relationship between impedance and thickness. Sensor is basically a three-terminal device. Features interdigitated driving and sensing electrodes and peripheral coplanar ground electrode that reduces parasitic effects. Patent-pending because first to utilize ground plane as "shunting" electrode. System less expensive than infrared, microwave, or refractive-index systems. Sensor successfully evaluated in commercial production plants to characterize emulsions, slurries, and solutions.
Improved Capacitive Liquid Sensor
NASA Tech Briefs ; 16 , 11
1992-11-01
Miscellaneous
No indication
English
Improved Capacitive Liquid-Level Probe
Online Contents | 1995
Improved Capacitive Liquid-Level Probe
NTRS | 1995
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