Monitoring Rapidly Changing Temperatures of the Oscillating Working Fluid in a Regenerative Refrigerator
Characterization of an orifice pulse tube refrigerator requires measurements of the instantaneous gas temperatures at various locations in the refrigerator. This presents several challenges. The temperature probe has to fit inside a 3 mm diameter tube with minimum disturbance to the flow. Void volumes, introduced by placement of a temperature probe into the system, have to be kept at a minimum. The temperature sensing device has be robust to survive pressure waves and mass flows oscillating at frequencies of up to 30 Hz. It also must have a fast response time to monitor the rapidly changing temperatures in the system. The temperature resolution has to be on the order of 10 mK. This paper discusses rapid temperature measurements with both thin-foil thermocouples and fine-wire resistance thermometers. A 4 μm diameter tungsten wire was found to satisfy these diverse requirements.
KeywordsTemperature Probe Temperature Oscillation Tungsten Wire Test Volume Pulse Tube
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