The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2006
Filed:
Oct. 14, 2003
Christoph Haas, Luzern, CH;
Yves Lüthi, Baar, CH;
Christoph Haas, Luzern, CH;
Yves Lüthi, Baar, CH;
Siemens Building Technologies AG, Zurich, CH;
Abstract
In a method of determining air humidity, a capacitive moisture measuring element () used in a moisture sensor for calculation operations is modelled by a parallel circuit of an ideal capacitor (C) and an ohmic resistance (Rp). Charging and/or discharging of the capacitive moisture measuring element () by way of a first measuring resistor (RRA) provides for ascertaining a first time constant or a first period duration of the charging and/or discharging operation, and charging and/or discharging of the moisture measuring element () by way of a second measuring resistor (RRA//R) provides for ascertaining a second one. The capacitance (C) of the moisture measuring element () is then calculated from the two time constants or the two period durations, a value for the moisture level finally being ascertained from the capacitance. This method achieves a higher level of measuring accuracy on the part of the moisture sensor.