Moisture sensor

US8236164B2 · kind B2 · utility

Assignee

• Acreo AB · SE

Inventors

• Goran Gustafsson · Säter, SE
• Xavier Crispin · Kimstad, SE
• Magnus Berggren · Vreta kloster, SE
• Oscar Larsson · Söderhamn, SE
• Xiaodong Wang · Söderhamn, SE

Key dates

• Filing date: Jul 8, 2010
• Grant date: Aug 7, 2012
• Expiry date: Oct 2, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49155
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A moisture sensor, for measuring moisture in a building without leaving visible scars to the building surface, is provided. The moisture sensor includes a flexible carrier carrying an antenna for receiving EM-radiation between 9 kHz and 11 MHz and a resonant circuit including a moisture reactive element. The moisture reactive element includes a hygroscopic electrolyte arranged between a first and a second electrode, wherein the electrolyte in the presence of moisture forms mobile ions and provides a complex impedance at least in response to the alternating voltage, which complex impedance varies with the moisture content of the electrolyte.