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1. (WO2011147414) A RESONANCE CIRCUIT HAVING A VARIABLE RESONANCE FREQUENCY

Pub. No.:    WO/2011/147414    International Application No.:    PCT/DK2011/000051
Publication Date: Dec 1, 2011 International Filing Date: May 26, 2011
IPC: G01L 1/14
G01L 19/08
G01M 5/00
Applicants: DANFOSS POLYPOWER A/S
BENSLIMANE, Mohamed Yahia
GRAVESEN, Peter
Inventors: BENSLIMANE, Mohamed Yahia
GRAVESEN, Peter
Title: A RESONANCE CIRCUIT HAVING A VARIABLE RESONANCE FREQUENCY
Abstract:
A resonance circuit with a variable resonance frequency provided by a variable capacitor (5) having compliant electrodes arranged on a deformable sheet (23). When the sheet (23) is deformed the capacitance is varied. Further a sensing element (3) comprising the resonance circuit and a sensing system comprising at least one sensing element (3), a sending unit (1) and a receiving unit (2). Suitable for mass production. Provides wireless sensing system being cost effective to manufacture. May be used for low cost products, such as toys. May also be used for monitoring displacements in structures, e.g. cracks (29) in wall structures (28). Further a positions sensitive pressure sensor with pressure sensors arranged on a two-dimensional structure (22).