DETECTOR OF MAGNETIC FIELD Russian patent published in 1997 - IPC

FIELD: instruments which measure intensity of magnetic field. SUBSTANCE: device has operational amplifier, which inverting input is connected to first terminals of first resistor and inductance coil which core is made from amorphous metal alloy. Direct input of operational amplifier is connected to first terminals of second and third resistors, which second terminals are connected to output of operational amplifier and ground line respectively. In addition device has integrating circuit which has fourth resistor and capacitor. One terminal of integrating circuit is connected to output of operational amplifier and second terminal of inductance coil. Another terminal of integrating circuit serves as device output. Ratio between resistance of second and third resistors is less than ratio between internal active resistance of inductance coil to resistance of first resistor. Core of inductance coil is connected to terminals of controlled direct current power supply and is designed as several identical layers which are made from amorphous metal alloy and are separated by insulating compound of high viscosity. Said layers are mounted on at least one side of thin-film substrate which is made from dielectric material. Its width is not lesser than width of packet of layers of amorphous metal alloy. It is rigid in plane which is perpendicular to axis of inductance coil. Amorphous metal alloy layers of core of inductance coil provide magnetic anisotropy which is induced in layer in perpendicular to axis of inductance coil; winding of inductance coil has variable pitch which is decreased in direction of winding sides. EFFECT: facilitated manufacturing, increased sensitivity, linearity and precision; decreased level of induced noise, low sensitivity to interference noise; increased bandwidth and amplitude range, decreased power usage, decreased weight and size. 4 cl, 3 dwg