Patent ID: 9360445
Filing Date: 2016-06-07
CPC Classification: G01N

Claim Text:
1. An electronic circuit arrangement for measuring relative humidity comprising: a. a quadrature sampling circuit having an input and an output; b. a capacitive humidity sensor having an input and an output wherein the output of the capacitive humidity sensor is connected to the input of the quadrature sampling circuit; c. a reference resistor, having an input and an output wherein the output of the reference resistor is connected to the input of the quadrature sampling circuit; d. a sinusoidal source having an output; e. a plurality of switches having a first state and a second state, wherein f. a computer having in input wherein the output of the quadrature sampling circuit is connected to the input of the computer; g. wherein said quadrature sampling circuit digitizes a plurality of quadrature-samples of the first voltage producing a first set of data samples, and digitizes a plurality of quadrature-samples of the second voltage producing a second set of data samples; h. wherein said computer