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Heinrich Ruser, Michael Horn
Weather Sensor Based on Temperature-Dependent Resistors Using “Multi-signal”-Analysis
Keywords: multi-signal analysis, wind sensor, rain sensor, thermal impedance, self-calibration
Uncomplex weather sensors based on PTC thermistors and Pt100 thermal resistors are described to be used e. g. for automated opening of windows. The performance needed is achieved through so-called “multi-signal” processing. A set-up consisting of three thermistors is used to obtain the wind direction and velocity using the result of an optimization procedure which constitutes a quality measure of the sensor measurements, giving a tool to on-line monitor the sensor’s state. With periodic excitation of a Pt100 thermal resistor the wind velocity as well as rain, snow, ice, and temperature are derived from the thermal impedance with sufficient accuracy and reliability. During operation, the parameters of the sensor model are observed, allowing drifts due to soiling or ageing to be detected and compensated.
tm – Technisches Messen, Oldenbourg Wissenschaftsverlag
Print ISSN: 0171-8096
Volume: 73, 07/2006
Pages: 422 - 431