Ultrasound sensor for a fumes extractor hood
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United States of America Patent
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-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Nov 11, 1999
filing date -
Nov 11, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Provided is to an ultrasound sensor for a fumes extractor hood, wherein the sensor monitors the vapor rising from the cooking to the extractor hood. Automatic compensation in respect of temperature and ageing drift of the sensor is effected. For that purpose checking of the resonance frequency is implemented cyclically during on-going operation of the sensor, in which case a shift in the resonance frequency is recognized, and the new resonance frequency is established by a statistical calculation method and used for further operation of the sensor.
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