Dual gaging 2200 C Johnson Noise Power Thermometer

A noise power thermometer for temperature measurements to 2200 C in reactor fuel rods was fabricated and tested for use in the loss of fluid test reactor safety tests. Temperature is determined by measuring the thermal noise spontaneously generated in a sensor coil. Thermoelement wires are used for connecting leads to the sensor coil and thereby provide for simultaneous temperature measurement as a thermocouple. The thermocouple probe is sealed with an alumina ceramic to metal seal and a stainless steel sheathed compensating lead cable transmits the output signal to the measurement instrumentation.