Circuit arrangement for evaluating the signal of a...

Details Circuit arrangement for evaluating the signal of a... Circuit arrangement for evaluating the signal of a...

G - Physics

01

N

G01N 27/22 (2006.01) G01D 5/24 (2006.01) G01D 5/244 (2006.01) G01R 27/26 (2006.01)

Patent

CA 2100303

A circuit arrangement for evaluating the signal of a capacitive measuring sensor (Cs) in particular a humidity sensor comprises a multivibrator (MV) which is remotely adjustable with respect to its frequency in order to provide a frequency independent from the measuring value as well as a monoflop (MF) which is triggered by the trailing edge of the pulses of the multivibrator and where the pulse length is determined by the measured value of the capacitive measuring sensor (Cs) connected to it. The pulses formed by the monoflop (MF) are integrated (R1,C1) and fed to one input of an amplification - and offset subtraction-circuit. With the output signal of this circuit the supply voltage of the circuit components may be increased in order to compensate for a degressive characteristic of the sensor (Fig. 1).

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