DIGITAL THERMOMETER Russian patent published in 2008 - IPC G01K7/32 

FIELD: measuring techniques.

SUBSTANCE: digital thermometer consists of two heat-sensitive piezoelectric resonators, put inside a protective capsule and connected to frequency assigning circuits of measuring self-contained generators, the outputs of which are connected to the first inputs of the units for generating differential frequency. The second inputs are connected to the output of the reference self-contained generator, and the third inputs are connected to the timer input of a computing unit, the first and second inverting inputs are connected to the outputs of the first and second units for generating differential frequency. The fourth input is connected to the output of a ROM, the input of which is connected to the first output of the computing unit, the second output of which is connected to the input of the indicator unit.

EFFECT: increased accuracy of measuring temperature with simplification of the structure of the device at the same time.

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