SU1478171A1 - Apparatus for measuring parameters of magnetic field - Google Patents

Abstract

The invention relates to the field of magnetic measurements using magnetic modulation devices and can be used to measure magnetic field parameters. The purpose of the invention is to improve the measurement accuracy by changing the excitation mode of the ferromagnetic core. The device contains a ferromagnetic core 1, a series-connected alternating magnetization pulse generator 2, a synchronized oscillator 3 of damped high-frequency oscillations and a winding 4 of the magnetization reversal of the ferromagnetic core, and a series-connected receiving winding 5, a key 6, an integrator 7 and a registration unit 8, the output of the alternating pulse generator connected with the second control input of the key. The proposed set of features provides for the magnetization reversal of the ferromagnetic core along a hysteresis-free curve, which, when registering the first pulse from the receiving winding, improves the measurement accuracy compared to the prototype. 2 Il.

Description

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The invention relates to the field of magnetic measurements and can be used to measure magnetic field parameters.

The purpose of the invention is to improve the measurement accuracy by changing the excitation mode of the ferromagnetic core.

FIG. 1 shows a block diagram of the device; in fig. 2 - time diagrams of his work.

The device contains a ferromagnetic core 1, serially connected oscillator 2 magnetization reversal., Synchronized generator 3 damped high-frequency oscillations and winding 4 magnetization reversal of the ferromagnetic core, as well as serially connected receiving winding 5, key 6, integrator 7 and registration unit 8, and generator output Remagnetizing pulses are connected to the second control input key a.

The device works as follows.

The input of the generator 3 and the key 6 receive the unlocking voltage pulses from the output of the generator 2, the frequency of which determines the frequency of the packets of damped high-frequency oscillations. As a result, a current from the generator 3 output begins to flow through the reversal magnetizing winding 4 and the magnetic state of core 1 changes from B0 to saturation, as a result of which the first useful voltage pulse carrying information about an external measured field appears on the receiving winding 5. Since key 6 is supplied with a trigger pulse, the first useful pulse travels to integrator 7 and is recorded by block 8.

After the termination of the control pulse from the output of the generator 2, the key 6 is closed and a decaying alternating current of the generator 2 begins to flow through the reversing winding 4 and the remagnetization core 1 goes through hysteresis loops. Under the action of this current, EMF interference is induced in the receiving winding due to the asymmetry of the hysteresis loops c. core 1 cores, but since key 6 is closed, interference pulses do not flow to the integrator and are not registered by block 8.

Consider the process of forming a signal on the receiving winding 5 in the absence and in the presence of an external measurable field. In the absence of an external field, the ferromagnetic core I is re-magnetized by packets of damped high-frequency oscillations supplied to the windings 4 of the magnetization reversal from

generator 3, due to which more complete demagnetization of core 1 is achieved, since the demagnetizing magnetic flux passes through a closed homogeneous magnetic circuit

5 without air gaps.

In the receiving winding 5, which simultaneously covers both cores of core 1, the induced emf is zero, since the magnetizing fluxes in the cores of the core are equal in magnitude and opposite in direction, therefore the output signal is also zero.

When an external constant field H0 appears, the ferromagnetic core 1

5 is affected by two fields — the magnetizing H0 and the re-magnetizing damped floor, due to which the hysteresis-free magnetization of the core 1 occurs, which, unlike the remagnetization along the main magnetization curve, has a significantly greater slope and linearity, which improves the measurement accuracy.

5 In addition, when changing the direction of the external measured field, the polarity of the signals on the receiving coil changes, not the phase as in the known device, thereby facilitating the detection and use of output pulses to measure the magnitude and direction of the external measured field.

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Claims (1)

Invention Formula A device for measuring magnetic field parameters containing a ferromagnetic core with a magnetization reversal winding and a receiving winding, a series-connected oscillator of magnetization reversal and a synchronized damped oscillator Its high-frequency oscillations, as well as the recording unit, are distinguished by the fact that, in order to increase accuracy by changing the ferrite-magnetic buzz mode. a core, a serial key and an integrator, the output of which is connected to the input of the registration unit, are introduced into it, the output of the damped high-frequency oscillations connected to the URN P L l L It is connected to the magnetization reversal winding, and the winding winding is connected to the signal input of the key, the control input of which is connected to the output of the alternating magnetization pulse generator. P Ј -t Al + t Tv Phage. 2