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Three omega probe with auto-zeroing

The aim of this study is to build an active auto-zeroing circuit for the three omega thermal conductivity measurement method to overcome the disadvantage of the method. For this purpose an auto-zeroing algorithm is implemented which consists of two stages; simply reading the voltage drops on lower hand side resistances with high resolution and setting the resistance of the digital potentiometer to the value calculated through proposed algorithm using the difference of acquired voltages. As a result, a probe with auto-zeroing capability is developed successfully. Usage of the new probe will increase the reliability of three omega measurement results by reducing the effects of uncertainties arising from manual zeroing routines.