Capacitive sensor for water absorption measurement in glass fiber resins using quartz crystals
Matko, Vojko ; Koprivnikar, Jože
The humidity sensor using the sensitive capacitive-dependent crystal is described. Presented is the probe sensitivity (dependence of df on dCx). In addition, the new idea of the excitation of the ...whole humidity sensor with stochastic test signals is described, and the humidity surface-measuring method is given. The latter includes the influence of test signals on the weighing function uncertainty. The results of the air humidity and water absorption measurement in glass fiber resins are shown experimentaly. The uncertainty of the surface humidity measurement is less than 0.1%. (T=15-25 oC and air humidity = 50-98%).
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