Title :
Highly sensitive humidity sensor for dielectric measurement (water absorption) in glass-fiber resins
Author :
Matko, V. ; Donlagic, D.
Author_Institution :
Fac. of Electr. Eng. & Comput. Sci., Maribor Univ., Slovenia
Abstract :
The humidity sensor using the sensitive capacitive-dependent crystal is described. Presented is the probe sensitivity (dependence of df on the dCx). In addition the new idea of excitation of the entire humidity sensor with stochastic test signals is described, and the humidity surface-measuring method is given. It includes the influence of test signals on the weighting function uncertainty and on the A/D-D/A conversion. The results of the air-humidity measurement and water absorption measurement in glass-fiber resins are shown experimentally. The uncertainty of the surface humidity measurement is less than 0.2%(T=15-25°C and air-humidity=50 to 98%.)
Keywords :
dielectric measurement; glass fibre reinforced plastics; humidity sensors; probes; 15 to 25 degC; A/D-D/A conversion; air-humidity measurement; capacitive-dependent crystal; dielectric measurement; glass-fiber resins; humidity sensor; humidity surface-measuring method; probe sensitivity; stochastic test signals; test signals; uncertainty; water absorption measurement; weighting function uncertainty; Absorption; Capacitance measurement; Dielectric measurements; Equations; Humidity; Oscillators; Probes; Resins; Sensor phenomena and characterization; Temperature sensors;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1996., IEEE 1996 Annual Report of the Conference on
Conference_Location :
Millbrae, CA
Print_ISBN :
0-7803-3580-5
DOI :
10.1109/CEIDP.1996.564581
