Thermally-Coupled Cryogenic Pressure Sensing
Improved methods for measuring low pressures in cryogenic systems are described. Pressure transducers and associated sensing lines are thermally coupled to the cryogen to eliminate thermo-acoustic-oscillations (TAO) caused by thermal gradients between the flow line and the transducer. The applications include flow and density measurement, and vapor bubble detection. Fully immersed and externally mounted transducers are used in these methods to reduce heat leak and measurement uncertainty. Implementation considerations are discussed, including transducer selection and temperature compensation.
KeywordsFlow Line Temperature Compensation Slug Flow Superfluid Helium Heat Leak
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