SU943618A1 - Magnetic signal diagram induction determination method - Google Patents

Description

(5) METHOD FOR DETERMINING THE INDUCTION OF MAGNETIC SIGNASHGRAMS

one

The invention relates to instrument making, namely to the control of magnetic carriers.

A known method for measuring magnetic recording parameters, which means that the magnetic tape sections produced by the magnetic powder by the dry method are weighed before and after the magnetic recording, i.e. determine the field of the waveform | g by the number of particles deposited

However, this method of measuring magnetic recording parameters is difficult to implement, since to increase the reliability of the result, each ts measurement is repeated 15–20 times and the average value of the mass of the settled magnetic powder is calculated.

There is also known a method for determining the induction of magnetic sound recordings, 20 which consists in placing a suspension of magnetic particles in a non-magnetic liquid in the form of a gel on the sound recording, heat it, then cool it. The gel is cut into strips, and the angles of inclination of the aggregates are determined; magnetic particles relative to the edges of the bands of the waveform 2.

The disadvantages of this method are the implementation complexity and low accuracy when measuring fields of arbitrary configuration.

The purpose of the invention is to improve accuracy.

Claims (2)

The goal is achieved by the fact that in the method of determining the induction of magnetic waveforms, including placing a magnetic particle suspension on a non-magnetic fluid and determining the angles of aggregates of magnetic particles, an additional magnetic field directed perpendicular to the horizontal field component in the plane magnetic waveform. and the magnitude of induction. In the waveforms, is determined by the formula B BAon-Ctgc where V. is the magnitude of the induction of the auxiliary magnetic field; cL is the angle between the initial and final orientations of aggregates of magnetic particles. This goal is also achieved by the fact that droplets of ferromagnetic liquid are used as magnetic particles. The drawing shows a block diagram of a device that implements the proposed method. Observations are carried out under a microscope. 1. Magnetic waveform 2 is located on table 3 and is located in the space between the coils Gel of the char. The method is carried out as follows. A magnetic tape 2 (for example, a tape, a map, etc.) is placed on a suspension of magnetic particles in a nonmagnetic liquid. The mutual arrangement of the microscope 1 and the stage 3 is changed until the aggregates of the magnetic particles become parallel to the horizontal line of the ocular grid (not shown). After this, the signalogram 2 is affected by an additional magnetic field by applying current to the Helmholtz i coils. The additional field is directed at a right angle to the horizontal component of the field scattered in the plane of the waveform 2. At the same time, the aggregates of magnetic particles are rotated by an angle ci. Further, according to the formula В Вдор-ctgo, the definition of the sound recording is determined. The use of a suspension of droplets of a magnetic fluid, for example, in water, additionally increases the accuracy of the method, since the density of the magnetic fluid is close to the density of water, and the friction between the droplets of ferromagnetic fluid and the surface of the waveform decreases. Increasing the accuracy in measuring the induction of sound recordings allows improving the quality of the developed magnetic heads and the magnetic recording medium. The method is simple to implement. The cost of an additional device for a microscope is 5 RUB. This device can be easily manufactured in a monitoring laboratory. The described method can be used in non-destructive testing in the magnetographic control method, where it is necessary to evaluate the induction of the field of diffusion of defects by measuring the induction of the field of dispersion of prints of these defects on a magnetic tape. Claim 1. A method for determining the induction of magnetic sound recordings, including placing a magnetic particle suspension in a non-magnetic fluid on the sound recording and determining the angles of the aggregates of magnetic particles, characterized in that, in order to improve the accuracy, the magnetic sound recording is affected by an additional magnetic field perpendicularly horizontal the component of the field is scattered in the plane of the magnetic waveform, and the magnitude of the induction, B, of the waveform is determined by the formula В Вдоп Ctgqf, where B. is the value nduktsii additional magnetic field, 0 - the angle between the initial and final orientations ai- regatta magnetic particles. 2. Method pop. 1, distinguishing it from the fact that droplets of ferromagnetic fluid are used as magnetic particles. Sources of information taken into account during the examination 1.Nazin L.F. Amplitude-wave characteristic of magnetic recording. - Technique of film and television, 1976, № 7, p. 59-61. 2. Kozyrev A.N., Peregud B, P., Hal Nin B.D. Visualization of complex magnetic fields. - Journal of Technical Physics, 1970, № 12, p. 2568257 (prototype).