Method of, and apparatus for, measuring the physical properties of cryogenic fluids

摘要

There is provided a method of measuring the physical properties of a cryogenic fluid within a storage vessel using at least one piezoelectric oscillator immersed in the cryogenic fluid within the storage vessel. The method comprises measuring the resonant frequency of the or each piezoelectric oscillator and determining, from the or each resonant frequency, the density of the cryogenic fluid within the storage vessel.