SU845177A1 - Method of measuring non-uniformity of carrier tape speed - Google Patents

Description

(54) METHOD OF MEASURING THE UNEQUALITY OF THE MOTION VELOCITY OF THE TAPE MEDIA

one

The invention relates to the field of instrumentation and can be used to measure the irregularity of the speed of movement of the tape carrier.

There is a known method for measuring the uneven speed of a tape carrier, in which a pulse signal is recorded on a carrier, played back, subtracted from the reproduction of a reference signal, the results of which judge the uneven speed of the carrier 1.

However, this method does not provide the required accuracy of measurements due to the influence on the measurement results of the deformation of the carrier in the area of the reproduction head.

There is also known a method for measuring the uneven speed of movement of a tape carrier, in which a pilot signal is recorded on a carrier, then this recording is reproduced and, by the phase difference between the reproduced and reference signals, the uneven speed of movement of the carrier 2 is judged.

The disadvantage of this method is also the low accuracy of the measurements due to fluctuations in the longitudinal tension and misalignment of the carrier.

The aim of the invention is to improve the accuracy and simplify the measurement process.

This goal is achieved due to the fact that the unevenness of the speed of the carrier is estimated directly during the recording of the control signal, while the control signal is recorded using a constant focused electrostatic field, reproduction using an electrostatic sensor, and the uneven speed of movement of the carrier judged by a signal reproduced by an electrostatic sensor.

The drawing shows a structured diagram of a device that implements a method of measurement. The irregularity of the speed of movement of the tape carrier.

The device contains an electrostatic head 1, which includes a pin 2, fixed in a holder 3. A pin 2 connected to a source 4 of high-voltage direct voltage, is oriented perpendicularly rigidly fixed counter electrode 5, on which the carrier slides

the recorded waveform 7. A ground electrode through a resistor 8 is a counter electrode 5 through an amplifier 9 connected to the first input of a dividing unit 10, the second input of which is connected to a constant voltage source I. The output of a dividing unit is connected to a recorder via a scaling unit 1.2. 14 are intended to eliminate carrier oscillations in a plane perpendicular to the axis of the pin 2.

The method for measuring the uneven speed of the tape carrier is dried as follows.

The carrier 6 is driven by a tape drive mechanism equipped with an electric drive. As a result of supplying a constant high voltage to the electrostatic head 1, the pin 2 will be constantly under the potential of a breakdown of the air gap between it and portions of the carrier 6.

The result of the air gap gap is the transfer of charge onto the carrier 6 by the electron beam arising during the breakdown. The charge is deposited on the dielectric carrier 6 in the form of a strip 7, the potential of which is determined by the amount of charge transferred from the pin 2 to the carrier 6, and the capacitance between the pin and the section of the carrier. The charge transferred to the carrier 6 flows in the form of a current along the circuit: carrier 6 - counter electrode 5 - resistor 8 - housing. The magnitude of the current is characterized by the potential of the strip and the series-connected resistances of the carrier 6 and the resistor 8.

The signal removed from the resistor 8 is amplified by the amplifier 9 and is fed to the first input of the dividing unit 19, the second input of which receives the reference voltage from the output of the constant voltage source 11. From the output of the division unit 10, the input of the recorder 13 receives a signal that is inversely generated on the resistor 8.

Thus, the process of measuring the uneven speed of the tape carrier is reduced to the process of recording onto the carrier of a continuous potential band of an electrostatic field, simultaneous REMOVAL. A signal in the tube's counter-electrode circuit and determining the reverse value of the latter. This eliminates the process of reproducing information and, therefore, the accuracy of the measurement is not affected by the deformation of the carrier.

Claims (2)

1. USSR Author's Certificate No. 532050, cl. G 11 B 27/10, 1965. 2. USSR author's certificate No. 326513, cl. Q 11 V 27/10, 1972 (prototype). /////////. s / "