Invention Grant
US09360445B2 Relative humidity and condensation measurement with a capacitive humidity sensor
有权
使用电容式湿度传感器进行相对湿度和冷凝测量
- Patent Title: Relative humidity and condensation measurement with a capacitive humidity sensor
- Patent Title (中): 使用电容式湿度传感器进行相对湿度和冷凝测量
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Application No.: US13374343Application Date: 2011-12-21
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Publication No.: US09360445B2Publication Date: 2016-06-07
- Inventor: William F Carlsen, Jr. , Hewlett E Melton, Jr.
- Applicant: William F Carlsen, Jr. , Hewlett E Melton, Jr.
- Applicant Address: US CA Sunnyvale
- Assignee: Carlsen Melton, Inc.
- Current Assignee: Carlsen Melton, Inc.
- Current Assignee Address: US CA Sunnyvale
- Main IPC: G01R27/26
- IPC: G01R27/26 ; G06F19/00 ; G01N27/12
Abstract:
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 device 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.
Public/Granted literature
- US20130166224A1 Relative humidity and condensation measurement with a capacitive humidity sensor Public/Granted day:2013-06-27
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