SU382915A1 - DEVICE FOR CONTACTLESS MEASUREMENT OF LENGTHS OF MOVING FERROMAGNETIC MATERIAL - Google Patents

Description

one

This invention relates to a measurement technique.

Arrangements for contactless measurement of the LENGTH of a moving ferromagnetic material are known, comprising read and write heads arranged along the direction of movement of the ferromagnetic material, a pulse counter and a conversion unit associated with a pulse counter, read and write heads and generating signals for applying a subsequent mark at the time of reading the previous mark .

However, the known devices have insufficient resolution, which is limited by the dimensions of the read and write heads and the minimum distance between them, eliminating the direct influence of the write head on the read head.

The purpose of the invention is to increase the resolution of the device.

This is achieved by the fact that the proposed device is equipped with an additional recording HEAD connected in parallel with the first recording head and spaced relative to it at a distance of / ±, where / is the distance between the read and first recording heads, d is the sampled count.

FIG. 1 shows a block diagram of the device; in fig. 2 is a diagram explaining the principle of obtaining the required discreteness.

The proposed device contains read / and two recording heads 2 and 5 located along the measured material 4. The distance between heads 2 and 3 is l ± d, where / is the distance between the read head / and the recording head 2, d is received discreteness of reference.

Heads 2 and 3 are connected to the read head HEAD through a conversion unit 5, to the output of which a counter of 6 pulses is connected.

The device works as follows. At the initial time (see Fig. 2a), using the start button, the recording heads 2 and 3 apply magnetic marks, which are conventionally depicted on the material as circles, on the moving material 4. And the open circle is a label applied once, the shaded label is applied twice.

Upon further movement of the material (see Fig. 2 6}, the first magnetic mark falls under the head / and is read by it. The signal conversion unit 5 amplifies the signal of the read HEAD / and generates the excitation signal HEAD. 2 and 5, at which time the two are recorded in parallel the following

tags on the material.

At positions a and b, the recording resolution of magnetic marks differs from the received discrete resolution d and is non-uniform. The beginning from position to discreteness is equal to d, and from position to position two twisting magnetization of the same marks occurs, which allows to obtain a clearer and more reliable recording.

The length of the wire is determined by the number of pulses recorded by the pulse counter.

Subject invention

A device for contactless measurement of the length of a moving ferromagnetic material, comprising reading and recording heads arranged along the direction of movement of the ferromagnetic material, a pulse counter and a conversion unit associated with the pulse counter, reading and recording heads. The generating signal of applying a subsequent mark at the moment of reading the previous mark, characterized in that, in order to increase the resolution of the device, it is equipped with an additional recording head connected in parallel to the first recording head and located relative to it at a distance of l ± d between the reading and the first writing head, d is the accepted disc of reference.

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