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A device capable of measuring temperature with a precision corresponding to a standard deviation of about 14 microdegrees at room temperature has been designed and constructed. The device employs a thermistor as the temperature-sensing element in an ac bridge. The bridge imbalance, after being amplified, is detected by two phase-sensitive detectors phase-shifted 90° with respect to each other to insure that both the resistive and reactive components of the bridge elements are balanced.
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Force et al. (1964) studied this question.
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