SU1543450A1 - Magnetic modulation head - Google Patents

Abstract

The invention relates to automation and measurement technology. The purpose of the invention is to increase the identity of the characteristics and to expand the dynamic range of operation by compensating for the interference signal. To do this, a key and a source of compensation for the magnetic disturbance field, made in the form of a strip of hard magnetic material, located between the pole tips of one of a pair of pole caps, the winding of which is connected to the collector element of the modulator via the key, are additionally introduced into the magnetic modulating head. 4 il.

Description

The invention relates to automation, measuring and computing technology and is intended for use in magnetometers, in storage and conversion devices with low, including zero, speeds of movement of a magnetic carrier. The purpose of the invention is to increase the identity of the characteristics and to expand the dynamic range of operation by compensating for the interference signal.

FIG. Figure 1 shows the design of a double-sided magnetic modulating head and a circuit for switching on the head in the recording mode of the interference compensation flow; in fig. 2 - diagrams for recording the recording of a stream in a hard magnetic strip; in fig. 3 — one-sided magnetic head design; in fig. 4 is a circuit for switching on a head in the playback mode of a magnetic field and diagrams that show the operation.

The device contains the first pole lugs 1, a non-magnetic gasket 2 in the first working gap, the first winding 3 records, a common magnetic circuit 4, in the additional gap of which is located the modulator 5, consisting of cores with a straight-i carbon hysteresis loop 6 and 7. On the cores are located the windings 8 of the dynamic displacement, the winding 9 of the clock supply, the output winding 10. The second pole tips 1) are adjacent to the magnetic conductor 4, containing a second gap with a hard magnetic strip 12 and a second winding 13 of the recording.

The device also includes a switch 14, current amplifiers 15, 16, a generator 17, a recording control device 18, a magnetic recording medium 19.

The head works as follows.

cl

and with

С SL

In the initial state, the informational signal does not come to the pole tips 1, the induction of the useful signal Be is zero, but the field of the interference B, Affects the head, and it must be compensated.

FIG. 16 shows a circuit including (w of the head in the mode of measuring the disturbance V o, and recording the compensation signal Vc into the gasket 12. The output winding 10 is connected via switch 14 to the amplifier | 5, whose input-output through resis-tor) rop R1 is connected to winding 13 records

If Be 0 (Fig. 2a), then zero is removed from the output of the Golfer at t 0 (Fig. 26) and the gasket 12 is demagnetized (Fig. 26). The decompression of the slider is accomplished by monotonous alternating current of amplifier 16 (Fig. 16), the input of which receives a signal from the generator 17 connected to the recording control device 18, which at the time of the demagnetization of the pad simultaneously opens the key 14, disconnecting winding 10 from the input of the divider 15.

If at time t 1 (Fig. 2a), a pulse of positive polarity is removed from the head output (Fig. 26). The device 13 closes the switch 14, passes the interference signal to the input of the amplifier 15, and once generates the generator 17, therefore the amplifier 16 receives a monotonically falling alternating voltage (high-frequency biasing), and the strip 12 is simultaneously affected by the recording signals of interference and bias.

FIG. 2d indicates the recording current of the compensation signal (without the effect of high-frequency magnetization), and FIG. 2d shows the induction of the 3r gasket, which at t 1 is equal in amplitude to and opposite to its sign.

To eliminate information distortion on magnetic media (not shown in Fig. 1), return 3 is supplied via resistor R2 (Fig. 16), a signal reversed in phase 3 k and equal in magnitude to current induced in winding 3 when part of the compensation flow enters through first equal head clearance (Fig. 2c).

If at time t = 2 3 ' s 0 (fig. 2a), then a negative pulse is removed from the head output

0 5

0

five

0

five

0

five

lnness (Fig. 26). The control unit turns off the head outlet 10, demagnetizes the gasket 12, then closes the key 14 and generates a high-frequency bias, which together with the recording current (Fig. 2d) forms a new value of the induction of the gasket (Fig. 2d). The current in the winding 3 changes sign (Fig . 2c).

FIG. Figure 3 shows the design of the magnetic head as part of a block of magnetic heads. As follows from the front view (Fig. 3a), the design is a two-track block consisting of a head 1 and a head 11 with a common modulator 5. If the source of information is a magnetic field, for example, an ore body, then for orientation of the head in X, Y or Z direction and sensitivity increase. The device includes a magnetic concentrator 20, as shown in FIG. 3g. In this case, magnetic media 19 is used to record measurement information, for example, a field ore body, which is then processed in a measurement and computing complex.

When playing information from a magnetic carrier, the winding 10 of the head is connected to the amplifier 15 (FIG. 4a).

When recording on the magnetic measuring medium 19, the circuit shown in FIG. 46. The signal from output 10 is fed to amplifier 15, covered by capacitive feedback, connected to amplifier 15 via resistor R1 - winding 3 and through resistor R2 - winding 13. In the initial state V € O, and the interference should be eliminated as described above method. When a Be signal appears (Fig. 4d), a current flows in the winding 3 of the record (Fig. 4e), reversed by the induction sign Ze. Thus, the Zap measurement is performed by compensating the input signal to zero.

Claims (1)

Invention Formula A magnetically modulated head containing a magnetic core with a modulator and a collector element coupled with two pairs of pole pieces with windings, one of which pairs contains a non-magnetic gasket in the working gap, characterized in that Be // figure 1 BUT four Q nineteen BUT 13 fig.Z b U Behind +1 8H T i Be mustache