RU2024965C1 - Device for playing of magnetic recording from industrial constructions - Google Patents

Abstract

FIELD: instrument engineering. SUBSTANCE: device has excitation pulse generator 1, transistor of power amplifier, delay element 4, magneto-modulation detector 3, trigger 5. EFFECT: improved reliability; improved efficiency. 2 dwg

Description

 The invention relates to instrumentation, and in particular to the technique of digital magnetic recording on massive non-special media.

 Known methods and devices for reproducing digital information signals from a magnetic recording medium [1].

 Known technical solutions are complex and, as a rule, are not intended for reading information recorded on non-special media, for example, ropes, cables, rails, sides of mine trolleys.

 The closest in technical essence to the proposed is a device that is free from these shortcomings [2].

 The prototype consists of a magnetically modulating sensor with pulsed excitation having a field winding and a signal pulse generator with a transistor power amplifier supplying the field winding of the sensor, isolation diodes and a trigger, with the terminal pins of the signal winding through the diodes connected to the trigger inputs and the midpoint to the collector normally closed transistor power amplifier.

 A disadvantage of the known device is the low reliability of reading information, especially single unipolar magnetic marks in the presence of fluctuations in the gap of the carrier-sensor. This is due to the use of a trigger with isolation inputs and isolation diodes, the switching of which with alternating alternating pulses of the signal winding is guaranteed only if there is a certain and approximately the same pulse amplitude of the signal winding of both polarities. Fulfillment of these requirements in conditions of fluctuations in the gap between the carrier-sensor and the inconsistency in the quality of the recorded label on a non-special medium is problematic.

 When recording unipolar magnetic marks on an industrial structure with a uniform pitch and a sufficiently high density, the reliability of the information being read increases due to the formation of zones with increased amplitude information signals between adjacent marks. However, even in this case, it also largely depends on the above-mentioned interfering factors.

 The purpose of the invention is to increase the reliability of reading information.

 The goal is achieved by the fact that a delay element is inserted into the device, connected between the collector of the transistor and the C-input of the trigger, the D-input of which is connected to one output of the signal winding of the magnetomodulation sensor, the other output of which and the emitter of the transistor are connected to the common bus.

 Figure 1 shows a diagram of a device; figure 2 - diagrams explaining its principle of operation.

 The device comprises an excitation pulse generator 1, a transistor 2 of a power amplifier with an excitation winding of the magnetomodulation sensor 3, a delay element 4, and a D-trigger 5.

 The device operates as follows.

The excitation pulse generator 1 generates short-term, for example, negative polarity voltage pulses, amplified by a power amplifier assembled on a transistor 2, in the collector circuit of which is connected the excitation winding of the sensor 3 (diagram U ₂ , figure 2). The delay element 4 delays the pulses of the excitation voltage for a time approximately equal to half their duration (plot U ₄ , figure 2).

When the magnetomodulating sensor 3 and the industrial structure, on which the magnetic marks to be reproduced are applied, are moved from the signal winding, the signal U ₃ is applied to the information input of the D-flip-flop (Fig. 2). The general case is shown here: the external magnetic fields of prints 1 and 2 do not overlap, and prints 2 and 3 interact strongly with each other. When the signal U ₃ exceeds the threshold "+ Δ", which corresponds to the logic level "1", the D-trigger is transferred to a single state along the trailing edge of the pulse U ₄ (pulse 1 of the diagram "Exit", figure 2). It is at this moment that the informational useful signal has a maximum value. In the future, the state of the trigger does not change until the arrival of the information signal, less than the threshold "+ Δ". After that, the trigger automatically switches to the zero state. The device works similarly when reading tags 2, 3, etc., one at a time. (diagram "Exit", figure 2), correctly identifying information, regardless of the recording density of the labels.

 The prototype reliably reads magnetic marks only in case of their strong mutual influence (marks 2 and 3, Fig. 2), when a zone with information signals exceeding the threshold “- Δ" is formed between the marks.

 The proposed construction of the device circuit provides a significant (15-25%) increase in the reliability of the reproduction of magnetic recording on non-special massive media.

Claims (1)

 DEVICE FOR PLAYING MAGNETIC RECORDING FROM INDUSTRIAL DESIGNS, comprising a magnetically modulated sensor with a signal winding, the excitation winding of which is connected between the power bus and the collector of the transistor, the base circuit of which is connected to the output of the pulse generator, a trigger, the output of which is the output of the device, characterized in that In order to increase the reliability of playback, a delay element is inserted into it, connected between the collector of the transistor and the C-input of the trigger, the D-input of which is connected to one the output of the signal winding of the magnetomodulation sensor, the other output of which and the emitter of the transistor are connected to a common bus.

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