HIGH-TEMPERATURE SQUID D C MAGNETOMETER Russian patent published in 1998 - IPC

FIELD: electromagnetic measurements, measurement technology, radio astronomy, geophysics, medicine to measure magnetic fields of human heart and brain. SUBSTANCE: high-temperature SQUID DC magnetometer has two-contact quantum interferometer, feedback coil inductively coupled to two-contact quantum interferometer, amplifier built on bipolar transistors at boiling point of liquid nitrogen, integrator, first and second power supply sources conductively uncoupled, bridge circuit which one arm includes first and second resistors connected in series which combined leads-out are linked to noninverting input of amplifier and which second arm includes two-contact quantum interferometer and third resistor connected in series. Bridge circuit and feedback coil are kept at boiling point of liquid nitrogen. EFFECT: magnetometer displays high sensitivity, high resistance to noises and possibility of operation in unscreened rooms. 2 dwg