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. 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 measurements is less than 0.2% (T=15-25°C and air-humidity=50 to 98%)
Keywords :
dielectric measurement; filled polymers; humidity measurement; humidity sensors; probes; 15 to 25 degC; A/D-D/A conversion; air-humidity measurement; dielectric measurement; epoxy glass fibre resins; humidity sensor; probe sensitivity; sensitive capacitive-dependent crystal; surface humidity measurements; water absorption; weighting function uncertainty; Absorption; Capacitance measurement; Capacitive sensors; Dielectric measurements; Frequency; Humidity; Oscillators; Probes; Resins; Temperature sensors;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1997. IMTC/97. Proceedings. Sensing, Processing, Networking., IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-3747-6
DOI :
10.1109/IMTC.1997.603994
