JPS5847182U - flux gate magnetometer - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a block diagram showing the configuration of one embodiment of the present invention;
The diagrams are the output waveform diagram of each part in the illustrated embodiment in Figure 1, and the output waveform diagram in Figure 3.
The figure shows a detailed block diagram of one embodiment of the excitation circuit section of the present invention, and FIG. 4 shows an output waveform diagram of each part in the embodiment shown in FIG. In the figure, 1 is an excitation circuit section, 2 is a triangular wave generation circuit, 3 is an amplifier circuit, and 4 is a synchronous rectification reference signal generation circuit. 5 is a magnetic sensor head, 6 is a ring core, 7 is an excitation coil, 8a and 8b are detection coils, 9 is a detection circuit, 10a and 10b are filter circuits, lla and 11b are synchronous rectifier circuits, 12a and 12b 13, 20 and 21 are comparators, 14 is an operational amplifier, 15 is an integrating resistor, 16 is an integrating capacitor, 17 to 19 and 28 are resistors, 22 is a + side reference power supply, 23 is one side reference power supply , 24 is a pull-up resistor, 25
26 represents a changeover switch, 26 represents a phase adjustment volume, and 27 represents a phase inverter.

Claims (1)

[Scope of utility model registration request] A ring core made of a ring-shaped ferromagnetic material around which an excitation coil is wound substantially over the entire circumference, and a detection device that outputs a signal corresponding to an external magnetic field by passing through the center of the ring core. a sensor head having a coil;
A flux gate magnetometer comprising an excitation circuit section that supplies alternating current to the excitation coil, and a detection circuit section that converts the output signal of the detection coil into a positive or negative DC signal corresponding to the direction of the external magnetic field. In O(゛), the excitation circuit' step is equipped with a triangular wave generating circuit that generates a triangular wave AC voltage and a synchronous rectification reference signal generating circuit that generates a square wave of an arbitrary phase from the output of the triangular wave generating circuit. A flux gate magnetometer, characterized in that a synchronous rectification reference signal generated by a synchronous rectification signal generation circuit is supplied to a synchronous rectification circuit present in the detection circuit.