Highly sensitive humidity sensor for dielectric measurement (water absorption) in glass-fiber resins

Author

Matko, V. ; Donlagic, Denis

Author_Institution

Fac. of Electr. Eng. & Comput. Sci., Maribor Univ., Slovenia

Volume

3

fYear

1997

fDate

9-14 Nov 1997

Firstpage

1148

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

absorption; dielectric measurement; electric sensing devices; glass fibre reinforced plastics; humidity measurement; probes; water; A/D-D/A conversion; air-humidity measurement; dielectric measurement; glass-fiber resins; humidity sensor; humidity sensor excitation; humidity surface-measuring method; probe sensitivity; sensitive capacitive-dependent crystal; stochastic test signals; surface humidity measurement uncertainty; water absorption; water absorption measurement; weighting function uncertainty; Absorption; Capacitance; Capacitive sensors; Dielectric measurements; Equations; Frequency; Humidity; Oscillators; Resins; Sea measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, Control and Instrumentation, 1997. IECON 97. 23rd International Conference on

Conference_Location

New Orleans, LA

Print_ISBN

0-7803-3932-0

Type

conf

DOI

10.1109/IECON.1997.668448

Filename

668448