Temperature measuring system

摘要

A temperature measuring system which includes a CR oscillator circuit and a logarithmic transformation circuit. The CR oscillator circuit employs at least a thermistor as the resistance element for forming a time constant with a capacitor which serves as the capacitance element, the oscillation frequency of the oscillator circuit varying with a change in ambient temperature. The logarithmic transformation circuit subjects the information obtained from the CR oscillator circuit to a logarithmic transformation, whereby said information is logarithmically compressed to provide numerical data approximately dependent upon ambient temperature.