SU1006944A1 - Device for measuring magnetic tape tensioning - Google Patents

Abstract

TENSIONING DEVICE FOR MEASUREMENT OF MAGNETIC RIBBONS, srtsernsashee generator coupled via a voltage divider with $ 1zheni pezorezo- Natori, vsholnennym a cylindrical console consisting of sensitive parts and resonant mass with a cylindrical piezoelectric crystal, and soy union of successively detector, preamplifier and an indicator of tl and h & This is because with the aim of expanding the measurement range and sensitivity, the Ace generator, the second voltage divider and the sum | - the preamplifier, and the resonant mass is made in the form of a two-stage cylindrical console, the first stage of which is rigidly mounted on an annular piezocrystal, on the second stage - a cylindrical piezocrystal, PEShchem each of the piezocrystals is connected through appropriate voltage dividers with generators, and through summa (предус preamplifier, detector and amplifier - with indicator.

Description

The invention of fire ognigs to measuring equipment, namely, devices for measuring parameters of magnetic recording equipment. A device for measuring the tension of a magnetic tape containing high and low frequency sinusoidal oscillators, an inductive sensor, and piezoceramic plates is known. A disadvantage of this device is its low sensitivity and accuracy of measurement. The closest to the invention in its technical essence is a device for measuring the tension of a magnetic tape, comprising a generator connected through a voltage divider with a piezoresonator made in the form of a cylindrical cantilever consisting of a sensitive part and a resonant mass with a cylindrical piezocrystal (2 A disadvantage of the known device is the low sensitivity and accuracy of measurements, a narrow tension measurement range, due to the design of a piezoreaato, chator .. The aim of the invention is to expand the measurement range and sensitivity increase. This goal is achieved by introducing a second generator, a second voltage divider and a TOFV preamplifier into the device, and the resonant mass is made in the form of a two-stage cylindrical console, in the first stage of which a ring piezo crystal is rigidly mounted the second stage is a cylindrical piezocrystal, each of the piezocrystals is connected through the corresponding voltage dividers with the generators, and through the sum {-preamplifier, detector and amplifier - with indica- tions. torus FIG. 1 is a circuit diagram of a voltage meter; in fig. 2 forms of resonator excitation signals, where tQ is the excitation frequency of a ring-shaped piezocrystal, fnn is the excitation frequency of a cylindrical piezocrystal, „.-- is the total frequency of the piezoresonator; in fig. 3 are graphs showing the limits of tension measurement, where F, Fn, Fa are resonance graphs at different tensions. The piezoresonator consists of the resonant mass 1 and the sensitive part 2, which the tape 3 bends around. The annular piezocrystal 4 is connected to the generator 6 through a voltage divider 5, and the cylindrical piezocrystal 7 is connected to a generator 9, each of the piezocrystals connected to an adder - preamplifier 10, detector 11, amplifier 12 and indicator 13. The device operates as follows. When powered by oscillators 6 and 9 of piezocrystals 4 and 7 by high-frequency voltage in a piezoreson, the frequencies add up (Fig. 2). As a result, we obtain the total frequency of a larger amplitude. In connection with this, the sensitivity of the resonant mass to the tension of the magnetic tape increases and the frequency range, which is directly proportional to the range of measurement of the forces applied to the sensitive part of the resonant mass, is 2H .. The sensitivity of the piezoceramic measuring resonator increases by 10% and the force measuring range e-j. My tension 4 times.

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Claims (1)

DEVICE FOR MEASURING MAGNETIC TAPE TENSION, comprising a generator connected through a voltage divider to a piezoresonator made in a vice-cylindrical console, consisting of a sensitive part and a resonant mass with a cylindrical piezocrystal, and a detector, amplifier, and indicator connected in series And with the fact that, in order to expand the measurement range and increase sensitivity, a second generator, a second voltage healer and an adder-preamplifier are introduced into it, and the resonant mass is It is filled in the vice of a two-stage cylindrical console, on the first stage of which a circular piezocrystal is rigidly mounted, on the second stage is a cylindrical piezocrystal, each of the piezocrystals is connected through the corresponding voltage healers to generators, and through the adder, the preamplifier, detector, and amplifier are connected to an indicator. "SU" ..1006944 sensitivity and accuracy close to the invention in essence is a device— 1 1006944