Title :
Sensor for the measurement of liquid permittivity using one measurement cell
Author_Institution :
Fac. of Electr. Eng. & Comput. Sci., Maribor Univ., Slovenia
Abstract :
A permittivity sensor using sensitive capacitive-dependent crystals is described. Presented is the probe sensitivity (dependence of df on permittivity). In addition, the new idea of excitation of the entire sensor with stochastic test signals is described, and the permittivity surface-measuring method is given. The latter includes the influence of test signals on the weighting function uncertainty. The uncertainty of the surface permittivity measurement is less than 0.01% (T=10-30/spl deg/C).
Keywords :
capacitive sensors; liquids; measurement uncertainty; permittivity measurement; sensitivity; 10 to 30 C; liquid permittivity measurement; permittivity sensor; permittivity surface-measuring method; probe sensitivity; sensitive capacitive-dependent crystal; sensor excitation; single measurement cell; stochastic test signals; weighting function uncertainty; Capacitance; Capacitive sensors; Equations; Frequency; Measurement uncertainty; Permittivity measurement; Probes; Pulse width modulation; Sensor phenomena and characterization; Testing;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2000 Conference on
Conference_Location :
Sydney, NSW, Australia
Print_ISBN :
0-7803-5744-2
DOI :
10.1109/CPEM.2000.851075
