D C COMPARATOR Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: D.C. comparator includes superconducting toroidal screen of rectangular section with through radial slit, comparison windings placed in screen, null-indicator with quantum interferometer. Characteristic feature of comparator lies in manufacture of case of screen from nonsuperconducting material with coating of inner and outer surfaces of case of screen with superconducting layers dissected over perimeter of rectangular section of toroid by two nonsuperconducting elements formed on inner and outer surfaces of toroidal screen to the right and to the left from through radial slit which is filled with superconducting material connecting inner and outer layers of screen. Outer superconducting layer of screen closed with Josephson element positioned on side of central hole of toroidal screen is used as quantum interferometer. EFFECT: enhanced accuracy of comparison. 3 dwg