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1. (WO2018122229) THIN WEIGHING SCALE USING ULTRASONIC LAMB WAVES AND METHOD USING SAME

Pub. No.:    WO/2018/122229    International Application No.:    PCT/EP2017/084598
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: G01G 3/16
G01G 3/13
Applicants: WITHINGS
Inventors: BEDETTI, Thomas
MEYRE, Arthur
BUARD, Nadine
HUTCHINGS, Cedric
Title: THIN WEIGHING SCALE USING ULTRASONIC LAMB WAVES AND METHOD USING SAME
Abstract:
A weighing device, configured to measure at least the weight of a person or an object, comprising a control unit (3), a sensory plate (1), a top plate (2), spacer pads (9), interposed between the plates,wherein the sensory plate has an emission transducer (11, Tx) configured to generate, a burst of Lamb waves (6) at the surface of the sensory plate, a reception transducer (12; 13, 14), to receive echoed Lamb waves (7) propagated through the sensory plate, the temporal profile of the echoed Lamb waves being dependent on the weight (P) applied to the top plate and passed by the spacer pads to the sensory plate, wherein the control unit determines the weight applied to the top plate by analysis of the temporal profile of the echoed Lamb waves.