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1. (WO2018125143) DETECTING CHANGES IN FOOD LOAD CHARACTERISTICS USING Q-FACTOR

Pub. No.:    WO/2018/125143    International Application No.:    PCT/US2016/069225
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 30 00:59:59 CET 2016
IPC: H05B 6/72
Applicants: WHIRLPOOL CORPORATION
PANASONIC CORPORATION
Inventors: GUATTA, Davide
NOCELLA, Valeria
RIGO, Mattia
Title: DETECTING CHANGES IN FOOD LOAD CHARACTERISTICS USING Q-FACTOR
Abstract:
An electromagnetic cooking device is provided having a controller and a plurality of RF feeds configured to introduce electromagnetic radiation into an enclosed cavity to heat up a food load. The controller is configured to: select a heating target; generate a heating strategy to determine a sequence of desired heating patterns; cause the RF feeds to output an RF signal to thereby excite the enclosed cavity; monitor the created heating patterns to measure resonances in the enclosed cavity and store a map of efficiency in frequency and phase domains from which the controller identifies resonant modes and Q-factors associated therewith; continue to monitor the created heating patterns and store maps of efficiency in the frequency and phase domains until a specified change is detected in at least one Q-factor; and when the specified change in the at least one Q-factor is identified, stop cooking the food load.