Ice thickness transducer

An ice presence sensor monitoring a liquid-solid phase-changing fluid, comprising:

• a flexible waterproof membrane having a first face in contact with said liquid-solid phase-changing fluid and a second face isolated therefrom;
• a sense probe passing through said flexible waterproof membrane and having a first end immersed in said liquid-solid phase-changing fluid and a second end distal to said first end isolated from said liquid-solid phase-changing fluid at least by said flexible waterproof membrane, said first end protruding from said flexible waterproof membrane beyond a boundary layer between said flexible waterproof membrane and said liquid-solid phase-changing fluid;
• an actuator assembly generating a motive force urging said sense probe to rotate with respect to said flexible waterproof membrane and responsive thereto move said sense probe first end in said liquid-solid phase-changing fluid if said sense probe first end is immersed in liquid and not move said sense probe first end in said liquid-solid phase-changing fluid if said sense probe first end is immersed in solid;
• and
• a detector assembly configured to monitor movement of said sense probe responsive to said actuator assembly motive force generation and configured if said sense probe is immersed in liquid to provide a liquid-indicative output and if said sense probe is immersed in solid to provide a solid-indicative output.