AN APPARATUS FOR DETECTING DEPOSITION OF ICE OR THE LIKE

摘要

An apparatus for detecting deposition of ice or the like on a surface, comprising a vibrator to be caused to vibrate by means of an electrical vibration source mounted on the surface. The vibration source comprises a sweeping oscillator having a frequency (f) which periodically varies within a range (f1..f2) in which the resonant frequencies (fri) of the vibrator at the prevailing deposits are comprised. The device is adapted to determine the voltage at resonace (uri) over the vibrator or an element in series therewith, which voltage is a measure for the impedance of the vibrator which is dependent on the deposition.