Cryogenic fluid level sensor

This patent describes a cryogenic level sensor assembly. It comprises a continuous length of high temperature ceramic superconductor material providing an indication of the level of cryogenic fluid as determined by the length of fluid in contact with the ceramic superconductor material; an exterior housing disposed apart from and at least partly around the ceramic superconductor material for holding the length of ceramic superconductor material; a support material disposed between the ceramic superconductor material and the exterior housing; and a resilient retention material disposed opposite the exterior housing and opposite the ceramic superconductor material for holding the superconductor material while allowing expansion and contraction thereof during thermal cycling