Measuring and linearizing circuit device for a capacitive...

Details Measuring and linearizing circuit device for a capacitive... Measuring and linearizing circuit device for a capacitive...

G - Physics

01

N

73/71

G01N 27/22 (2006.01) G01N 27/12 (2006.01)

Patent

CA 1208931

ABSTRACT OF THE DISCLOSURE A humidity sensor operates with a capacitive sensor element (CS) which is arranged in one branch of a free-running multivibrator (MV), whereas a reference capacitor (Cref) is arranged in the other branch of said multivibrator. Both output signals (U1, U2) of said multivibrator (MV) are averaged by means of RC elements (R3, C1; R4, C2) and supplied to a differential amplifier (DV), the output signal (Ua) of which changes the operating voltage (UB) of the multivibrator (MV), and therefore, linearizes the characteristic of the capacitive sensor element (CS).

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