LIQUID NITROGEN LEVEL METER USING A HIGH TEMPERATURE SUPERCONDUCTOR DETERMINING THE LEVEL OF LIQUID NITROGEN BY USING SUPERCONDUCTIVITY/NORMAL CONDUCTIVITY PHASE CHANGE CHARACTERISTICS ACCORDING TO THE TEMPERATURE OF A FILAMENT

摘要

PURPOSE: A liquid nitrogen level meter using a high temperature superconductor is provided to measure the level of liquid nitrogen in which the boiling point is 77 K by using a filament of a high temperature superconductive material in which critical temperature is more than 80 K.;CONSTITUTION: A liquid nitrogen level meter using a high temperature superconductor includes a filament (100) of a high temperature superconductive material, a heater (200), a power supply unit (300), and a level determination unit (400). The filament of a high temperature superconductive material is installed inside a liquid nitrogen container. The heater is spaced at a predetermined interval from the filament to be parallel to the longitudinal direction of the filament and provides thermal energy to the filament. The power supply unit supplies a current to the filament and the heater. The level determination unit measures voltages of both end portions of the filament and determines the level of liquid nitrogen contained in a liquid nitrogen container by using a difference between the voltage values of both end portions.;COPYRIGHT KIPO 2013;[Reference numerals] (100) Filament; (200) Heater; (300) Power supply unit; (400) Level determination unit; (AA,BB,CC,DD) Thermal energy