Platinum resistance thermometer circuit
Abstract
A platinum wire resistor is exposed to a temperature to be measured. The voltage drop across the resistor is input to a differential amplifier. The platinum resistor is connected to ground through a sensing resistor. Variations in voltage across the sensing resistor drive the differential amplifier to maintain a constant current through the resistance thermometer and the sensing resistor. A second differential amplifier connected across the resistive thermometer forms an output signal which is related to the temperature of the sensor and, hence, proportional to the measured temperature.
- Publication:
-
National Aeronautics and Space Administration Report
- Pub Date:
- October 1971
- Bibcode:
- 1971nasa.reptR....M
- Keywords:
-
- Platinum;
- Thermometers;
- Circuits;
- Electrical Resistance;
- Patents;
- Temperature Measurement;
- Instrumentation and Photography