Title :
Measurement of liquid permittivity using one measurement cell
Author_Institution :
Fac. of Electr. Eng. & Comput. Sci., Maribor Univ., Slovenia
Abstract :
A permittivity sensor using a sensitive capacitive-dependent crystal is described. The probe sensitivity (dependence of df on permittivity) is studied. In addition, a new idea of excitation of the entire sensor with stochastic test signals is described, and a permittivity surface-measuring method is discussed. The latter includes the influence of test signals on the weighting function uncertainty. The results of the permittivity measurement are shown experimentally. The uncertainty of the surface permittivity measurement is less than 0.01% (T=10-30°C)
Keywords :
capacitive sensors; dielectric liquids; measurement uncertainty; permittivity measurement; liquid permittivity measurement; one measurement cell; permittivity sensor; permittivity surface-measuring method; probe sensitivity; sensitive capacitive-dependent crystal; sensor excitation; stochastic test signals; surface permittivity measurement uncertainty; weighting function uncertainty; Capacitive sensors; Equations; Frequency; Oscillators; Permittivity measurement; Probes; Pulse width modulation; Stability; Temperature sensors; Testing;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2000. Proceedings of the 6th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
0-7803-5459-1
DOI :
10.1109/ICPADM.2000.876402
