SU943614A1 - Device for measuring magnetic field parameters - Google Patents

Description

C5 ") DEVICE FOR MEASUREMENTS OF MAGNETIC FIELD METRAMETERS

one

The invention relates to a measurement technique and is intended for measuring magnetic field parameters.

A device for measuring magnetic field parameters is known, which contains a ferromagnetic core, an excitation generator, and a measuring winding l.

A disadvantage of the known device is the low accuracy of the measurements, since the flux probe consists of one core core. In this case, the output signal contains, along with the useful signal of the second harmonic of the excitation frequency, the signal S is the first harmonic, which is large and can exceed the useful signal hundreds and thousands of times. In this case, the selection of the desired signal with high accuracy is almost impossible.

Closest to the present invention is a device that contains a ferromagnetic core (rod annular, etc.), an excitation generator, an excitation and measuring windings 2.

J The known device operates as follows.

It is placed in a magnetic field whose parameters are to be measured. Next to the field winding

10 is supplied with alternating current from the excitation generator. Under the action of induction of the measured field in the measuring winding, an emf of the second harmonic of the frequency of the excitation field arises,

15 whose amplitude is proportional to the magnitude of the induction of the measured field.

A disadvantage of the known device is the low accuracy measured by the scientific research institute due to magnetic noise (excessive noise).

Claims (2)

The purpose of the invention is to improve the accuracy of measurements of the parameters of the magnetic field. This goal is achieved by the fact that a device for measuring parameters of a magnetic field containing a ferromagnetic core with measuring and exciting windings, an excitation generator connected to the excitation winding, is equipped with a biasing generator connected in series to the ferromagnetic core, whose connecting contacts are located on its noBjepx symmetrically relative to the magnetic device axis. Fig. 1 shows a device for measuring magnetic field parameters; in fig. 2 shows an embodiment of the ferromagnetic core of the device in the form of rods with contacts in FIG. 3 - the same, in the form of a frame with contacts, in FIG. - the same, in the form of a ring with contacts. The device (Fig. 1) contains a ferromagnetic core 1 (Fig. 2 -), exciting 2 and measuring 3 windings and an excitation generator. In addition, it is equipped with an additional low-power biasing generator 5, connected in series to the ferromagnetic core 1 by contacts 6 and 7, located on the surface of the core 1, symmetrically with respect to the magnetic axis 8 of the device. The device works as follows. It is placed in a magnetic field whose parameters, such as induction, must be measured. Next, the ferromagnetic core 1 is excited (remagnetized) by a magnetic field created by the current flowing on the excitation winding 2, which is produced by the excitation generator k. At the same time, the current from the additional low-power biasing generator 5, connected in series to the core 1 by contacts 6 and 7, is located symmetrically relative to the magnetic axis 8. 9 4 Under the influence of induction of the measured field in the measuring winding 3, an emf of the second harmonic of the excitation field frequency appears. The amplitude of this emf is proportional to the magnitude of the induction of the measured field. At the same time, the alternating current flowing through the core 1 from the additional generator 5 and the magnetic field created by it allow the domain boundaries of the hard regions in the core 1 volume to be removed from the deep potential meters, resulting in a decrease in the level of excessive noise, which leads to an increase in measurement accuracy. Laboratory tests of the layout of the proposed device show that in comparison with the known, it has a 3- $ times lower noise level. The proposed device should be used in metrology, geophysics, for space and biomedical research, as well as in the field of physical experiment. The invention The device for measuring the parameters of a magnetic field, containing a ferromagnetic core with measuring and exciting windings, an excitation generator connected to the excitation winding, so that, in order to improve accuracy, it is equipped with a bias generator connected in series to a ferromagnetic core, the connected contacts of which are located on its surface, symmetrically relative to the magnetic axis of the device. Sources of information taken into account in the examination 1. U.Afanasyev and other Ferrozondy. L., Energie, 1969, p. 38 2. Afanasyev Yu. Ferrozond. L., Energie, 1969, p. 635. ix f JA Wi.J 2 /