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A method and system for detecting the presence of a frozen deposition at an interface between a substrate of known thermophysical properties and surroundings of unknown thermophysical properties. The system involves applying a predetermined quantity of heat to a temperature sensor positioned at the

A method and system for detecting the presence of a frozen deposition at an interface between a substrate of known thermophysical properties and surroundings of unknown thermophysical properties. The system involves applying a predetermined quantity of heat to a temperature sensor positioned at the interface to cause a thermal perturbation, measuring an output signal of the sensor subsequent to applying the predetermined quantity of heat, and comparing one or more measured values of the output signal to one or more reference output level values to determine the presence or absence of the frozen deposition.

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[ I claim:] [1.]1. A method for detecting the presence of a frozen deposition at an interface between a substrate of known thermophysical properties and surroundings of unknown thermophysical properties comprising the steps of:applying a predetermined quantity of heat to a temperature sensor positio

[ I claim:] [1.]1. A method for detecting the presence of a frozen deposition at an interface between a substrate of known thermophysical properties and surroundings of unknown thermophysical properties comprising the steps of:applying a predetermined quantity of heat to a temperature sensor positioned at said interface to cause a thermal perturbation without melting said frozen deposition if present;measuring at least one output signal of said sensor subsequent to said applying step, said output signal being a function of the temperature of said sensor;comparing at least one measured value of said output signal to at least one reference value to determine the presence of said frozen deposition.