In frost growth control on finned surfaces, the most important frost properties are thickness and density. As shown in previous work, the frost thickness can be related to the temperature difference between frost surface and the fin or tube. The frost temperature can be obtained by using an infrared thermometer. A frost density sensor is designed. A set of strain gages are installed in a flexible beam element (HDPE), which deflection caused by frost accretion is related to the change in frost density. A prototype of the sensor is tested for distributed frost weight and for artificial probe tip-loads. The relation between the sensor signal and frost weight is obtained for the cases studied. The combination of frost top temperature and weight variation signals can be used to control the defrost process.

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