Sensor for high-air-humidity measurement

Author

Matko, Vojko ; Donlagic, Dali

Author_Institution

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

Volume

45

Issue

2

fYear

1996

fDate

4/1/1996 12:00:00 AM

Firstpage

561

Lastpage

563

Abstract

The humidity sensor using the sensitive capacitive-dependent crystal is described. Presented is the probe sensitivity (dependence of df on the dC_x). 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 of the weighting function uncertainty and of the A/D-D/A conversion. The results of humidity measurement with the excitation signals are shown experimentally. The uncertainty of the surface humidity measurement is less than 0.2% (T=15-25°C and humidity=50-98%)

Keywords

capacitance measurement; digital instrumentation; electric sensing devices; humidity measurement; signal processing; stochastic processes; 15 to 25 C; A/D-D/A conversion; excitation signals; high-air-humidity measurement; humidity sensor; humidity surface-measuring method; probe sensitivity; sensitive capacitive-dependent crystal; stochastic test signals; surface humidity measurement; test signals; weighting function uncertainty; Bridge circuits; Capacitance; Capacitors; Frequency; Humidity measurement; Oscillators; Probes; Pulse width modulation; Stability; Temperature sensors;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.492787

Filename

492787