| 摘要 |
PURPOSE:To obtain DC output corresponding to the gradient of a magnetic field, by inserting windings wound around a first magnetic core and a second magnetic core into one arm of a bridge circuit in series in inverse polarity and detecting the code of the non-equilibrium voltage of a bridge by an operator amplifier to self-excite both magnetic cores. CONSTITUTION:A magnetic response part 100, a display circuit part 200 and a DC stabilized power source part 300 are provided and a variable resistor (VR)6, primary windings 2 formed by winding primary windings around magnetic cores 4a, 4b in series in inverse polarity and a condenser 5 are provided to one arm of the bridge circuit of the response part 100 as elements constituting said bridge circuit and VR11, 10 are provided to the other arm of said bridge circuit. The coupling point A of the terminal 2a of the winding 2 and VR6 is connected to the non-reversal input P of an operator amplifier OP1 and the coupling point B of VR10, 11 is connected to the reversal input N thereof. OP1 detects the code of the non-equilibrium voltage of the bridge and the magnetic cores 4a, 4b are self-excited by the positive and negative DC voltages of the circuit part 200. By this mechanism, the gradient of the magnetic field applied to the magnetic cores 4a, 4b can be applied to the circuit part 200 by DC-DC transmission. |
