SU746707A1 - Device for determining longitudinal deformation of carrier tape - Google Patents

Description

(54) DEVICE FOR DETERMINATION OF LONG-TERM DEFORMATION OF TAPE MEDIA

one

The invention relates to a measurement technique and is intended for use in tape signal carrier test systems.

The known device for determining the longitudinal deformation of the tape carrier 1 does not have an increased quick response and accuracy due to the limitation of the frequency spectrum in the high frequency region and the difficulty of stabilizing the amplitude and frequency of the test signal.

Closest to the invention is a device for determining the longitudinal deformation of a tape carrier, comprising a pulse shaper connected in series, a measuring unit and a recorder, reading elements connected to the inputs of the pulse shaper, and differentiating element 2.

The disadvantage of this device is a predetermined number of measurement tracks in advance, regardless of the level of deformation, affecting the accuracy of its determination. In the device in small deformation zones, it is not possible to increase the number of measurements to accurately determine the distortions of the signal carrier, and for each track of the reproduction head, separate signal conditioning channels are used.

The purpose of the invention is to improve the accuracy of the device.

To achieve this goal, it 5 contains a time converter connected to the input of the differentiating element and connected to the output of the pulse former, a multivibrator, a threshold element and a step-current generator, one input of which is connected to the output 10 of the time converter, and the other inputs respectively through the multivibrator and threshold element - with the outputs of the differentiating element and the output of the step-current generator connected to the inputs of the reading elements.

In addition, each reading element is made of a cathode ray tube with a btclone system and a metal fiber screen and a 20th counter electrode connected to a zero potential, the input of the deflecting system and the output of the counter electrode being connected respectively to the input and output of the reading element.

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FIG. 1 shows the functions of a light device diagram; in fig. 2 - electrostatic tape carrier; in fig. 3 is a structural diagram of the reading element.

The carrier 1, on which the test signal 2 is recorded in the form of straight lines, perpendicular to the edge of the carrier 1 at a distance B from each other, is in front of the reading elements made in the form of

electrically radiation tubes 3 and 4 (Fig. 2)

with counter electrodes 5 - and 6, grounding them. Resistors 7 and 8 through limiting amplifiers 9 and 10 are connected respectively to the first and second inputs of the driver 11 pulses, the output of which is connected to the input of the time converter 12, with differentiating element 13 and with re - and a histrator 14 through the measuring unit 15. Differentiating element 13, through the multivibrator 16, is connected to one of the generator inputs 17 of the stepped current, the other input of which is connected to the output of the time converter 12, with the generator running 17 of the step current connected to the diverting systems 18 and 19 of the electron-beam tubes 3 and 4, to the cathodes 20 and 21 of which are connected, the outputs of the constant voltage source 21, and to the third entrance to its 25 through the threshold element 23.

Electron-beam tubes (CRT) 3 and 4 are made with a metal fiber screen 24, a cathode 20 and a deflecting system 18. Electrostatic carrier 1 is in front of a metal fiber screen 24, opposite which there is a fixedly mounted counter electrode 5 made of solid conductive material and ground through resistor 7.

The device works as follows.

The recorded control signals 2 are read from the moving carrier 1 in the studied tape drive mechanism by the spinless electron beams of the EFR 3 and CRT 4 feed paths to the deflecting systems, 18 and 19 of the current from the generator 17. The amplitude and duration of the generator steps depends on the amount of deformation, those. in zones of small deformations, the number of measurements increases and the accuracy of the determination of deformation increases.

When the carrier 1 (Fig. 2) is moved, reading signal 3 and 4 first receive the read signal at the output of element 1, element 3, at the intersection of the CRT beam 3 of the test mark 2. About At that time, the gap current gap and the fiber glass screen 24 (FIG. 3) The CRT 3 carrier 1, which flows through the counter electrode 5 and the resistor 7 to the ground, creates a voltage drop on the latter. After a certain time interval proportional to the strain (Fig. 2), the read signal on the resistor 8 appears, obtained from the reading element 4. At this moment

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It is desirable to move the electron beams of CRT 3 and 4 to the distance C (Fig. 2) from the previous position (since test mark 2 is already under the screen of the CRT 3 at this point, i.e., to make the amplitude of the displacement step dependent on the magnitude of the longitudinal strain) .

The signals on resistors 7 and 8 are amplified and limited in amplifiers 9 and 10 and are fed to the separation inputs of the pulse former I. At the output of the latter, a pulse occurs, the duration of which is directly proportional to the distance a (Fig. 2). This pulse controls the amplitude and duration of a step of a stepped current generator 17 so that c. small deformation zones to increase the number of measurements and improve the accuracy of the deformation, and the generator current 17, through the deflecting systems 18 and 19, controls the movement of the electron beams of the CRT 3 and 4.

CRT 3 and CRT 4 are set so that their screen centers are shifted parallel to the test labels at a distance A so that CRT 4 reads information about test labels 2 lower than CRT 3, with the subsequent ability to read each CRT information from each test tags. At the same time, in order to be able to determine both positive and negative longitudinal deformations, the parallel read lines of the CRT 3 and 4 are set at an angle to the direction of movement of the information carrier at a distance A in (A-11) from each other, where in is the distance between two by test marks, Е — relative deformation of this type of carrier, D is chosen equal to the arithmetic average thickness of two traces obtained from CRT 3 and CRT 4 when read on carrier 1 (Fig. 2).

Claims (2)

With synchronous {) {) placing CRT 3 and CRT 4 rays with a step generator 17 using deflecting systems 18 and 19 on the surface of carrier 1, in the absence of longitudinal deformation of the latter, the electron beam of CRT 4 crosses test mark 2 with a delay that is proportional to in-sZ. Limiting amplifiers 9 and 10 generate pulses on the leading edge of the pilot signal, which are fed to the separate inputs of the pulse former 11. The latter generates pulses proportional to the delay B2: measuring unit 15 compensates the known delay, and the recorder 14 draws a zero line corresponding to the case when deformation is absent. In the presence of deformation, the distance b2 changes, respectively, the pulse duration at the output of shaper 11. In this case, the recorder will draw a curve located above or below the zero line containing information about both the magnitude of the deformation and its sign. In addition, the pulse from the output of shaper 11 by temporal converter 12 is converted into a signal that determines the amplitude of a step of a stepped current generator 17, minimally moving the electron beams of CRT 3 and CRT 4, and the minimum time duration of the same step is controlled by a multivibrator 16, which controls the signal the differentiating element 13, the signal to the input of which is supplied from the output of the pulse shaper 11. To return the electron beams of the CRT 3 and the CRT 4 to the initial position after passing it through to this screen, the threshold element 21 is used, the binding step current output generator 17 with one of its inputs. Block 20 generates a constant voltage that is necessary for the normal operation of the CRT reader. Claim 1. Device for determining longitudinal deformation of a tape carrier, comprising in series a pulse shaper, a measuring unit and a recorder, reading elements connected to the pulse shaper inputs, and a differentiating element, in order to increase the accuracy of the device a converter connected to the input of the differentiating element and connected to the output of the pulse former, a multivibrator, a threshold element and a generator p stepwise current which bdinvhod coupled to an output of temporary transducer, and other inputs / sootvetstvonno through multivibrator threshold and elemental yield the differentiating element and the output step generator toKa, connected to the inputs of sensing elements. 2. The device according to claim 1, characterized in that, in order to increase the accuracy of the device, each reading element consists of a cathode-ray tube with a deflecting system and a metal fiber screen and a counter electrode located opposite it, and having a zero potential, and the input of the deflecting system and the output of the counter electrode is connected respectively to the input of the Shodusch test element. Sources of information taken into account in the examination 1. USSR author's certificate number 349878, cl. G 06 G 13/04, 1970: 2. USSR author's certificate number 319947, cl. G 06 G 13/04, 1970 (prototype).  i -; ,,, „,,,,,.,  :, fc.v.,:,. ,,, ..; X, v 4,., 746707 FIG. 2