Relative humidity and condensation measurement with a capacitive humidity sensor
摘要
A method and apparatus for measuring relative humidity including condensing environmental conditions using a circuit with a capacitive humidity sensor and a reference resistor each connected to an input of a switch means and thence a quadrature sampling circuit. A sinusoidal source is first connected to the reference resistor and secondly to the capacitive humidity while a signal ground is first connected to the capacitive humidity sensor and secondly to the reference resistor. This produces a first voltage and a second voltage that are each sampled in quadrature. A complex ratio of the sampled voltages is calculated and converted into a representation of relative humidity.
申请公布号
US2013166224(A1)
申请公布日期
2013.06.27
申请号
US201113374343
申请日期
2011.12.21
申请人
CARLSEN, JR. WILLIAM F.;MELTON, JR. HEWLETT E.;CARLSEN MELTON, INC.