SU838309A1 - Method of measuring transverse vibrations of moving web carrier web - Google Patents

Description

across the width of the carrier at a constant speed.

Figure 1 presents the block diagram of the device that implements the proposed method; Fig. 2 is a graph showing the variation in potential of a pilot signal across a carrier.

The device contains a CRT 1 with MVE, installed perpendicular to the fixed counter electrode 2 and the tape carrier 3, on which the control signal-signal is plotted 4. The cathode and the deflection of the tube I pipe system are connected to the generator 5 sawtooth voltage. The counter electrode 2 grounded through resistor 6 through amplifier 7 is connected to the input of recorder 8. Tension rollers 9 are designed to eliminate oscillations of the tape carrier 3 perpendicular to the plane of the latter, and groove 10 on the counter electrode 2 to eliminate transverse oscillations of the carrier

The method of measuring the transverse vibrations of a moving tape carrier is carried out in the following manner.

In the process of writing to the cathode and deflecting system of a CRT with MVE, a sawtooth voltage falls from the generator's high voltage. 5. Scanning beam on CRT 1 falls on the electrodes of the electrochemical element, which are charged to the potential of the breakdown. As a result of the latter, charge transfer from the MVE electrodes to the tape carrier 3 occurs in the form of a potential that varies linearly across the carrier. When playing back a tape carrier 3 with the recorded control waveform 4, the MVE of the CRT 1 and the counter electrode 2 is pulled between the cathode and the deflecting system of the CRT 1, a sawtooth voltage is still applied.

When the beam hits the screen electrodes located opposite the sections of the tape carrier 3 with recorded waveform 4, an air gap breaks between MVE CRT 1. and carrier 3. On the resistor 6 the voltage drops due to the flow of the current, the value of which depends on the potential difference between the electrodes MVE CRT 1 and parts of the recorded waveform 4. The signal, which is connected from the resistor 6, is amplified

in the amplifier 7 and recorded by the recorder 8.

In the absence of transverse oscillations of the carrier, the current breakdown will be constant,

Since the potential difference between the MVE electrodes of a CRT 1 located across the width of the screen varies according to a linear law, and the sections of the control signal chart, depending on the width of the carrier, have a residual potential varying according to the same linear law. Thus, the constant voltage level is removed from the resistor 6.

With transverse oscillations of the carrier, the above indicated potential difference varies with the magnitude of the transverse oscillations. Removed from the resistor 6 signal kapaKTepkiziruet the law of transverse oscillations of the carrier. ,

The proposed method of measuring the transverse vibrations of the tape carrier

Highly accurate and allows

Receive information on oscillations of different 1x sections of the carrier with the help of a single recording device - reproduction.

Claims (2)

1. USSR author's certificate number 572845, cl. Q 11 B 27/18, 1976. 2. USSR author's certificate number 593248, cl. q 11 b 27/10, 1976 (prototype). .f Fig 2