Multi-functional sensing or measuring system

Details Multi-functional sensing or measuring system Multi-functional sensing or measuring system

1981-01-28

1983-12-06

Yasich, Daniel M.

Thermal measuring and testing

Temperature measurement

Composite temperature-related paramenter

73336, 733365, 236 46C, 252194, 338 25, 338 35, 374142, 374164, G01K 700, G01W 2702

Patent

active

044190212

ABSTRACT:
A multi-functional sensing and measuring system capable of detecting both temperature and humidity is fabricated from a porous metal-oxide ceramic whose dielectric constant varies with temperature and whose electric resistance varies with ambient humidity. The sensing element is connected in series with a resistor and a rectangular pulse voltage is applied across the series combination, and the ambient temperature and humidity are measured simultaneously in terms of (i) the circuit time constant (to measure temperature) of a transient state value and (ii) the steady state value of the voltage across the resistor (to measure humidity).

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