SU1053157A1 - Method of measuring parameters of motion of tape medium - Google Patents

Abstract

A METHOD FOR MEASURING PARAMETERS OF TAPE MEDIUM MOVEMENT, in which a control signal in the form of electrostatic potential lines is applied to a fixed tape carrier symmetrically relative to the longitudinal line of the carrier, while moving, the potentials of four points of the control signal are reproduced by scanning the beam of a cathode ray tube with a metal fiber screen across the direction while moving carrier movements, measure the time intervals between a sequence of reproduced potentials and by measurement The time intervals measure the speed of carrier movement, characterized in that, in order to increase the accuracy of the speed measurement and expand the functionality, the electrostatic potential of the control signal is applied in the form of two rays at an acute angle, the potential along the beam modules -, ruled according to a linear law, and the skew angle, the longitudinal and transverse components of the carrier speeds are determined by the variations g Ctf4-tP-1 4z (M,) t34) «+

Description

The image refers to the technique of information accumulation, in particular, to methods of measuring the motion parameters of a tape information carrier.

There is a known method for measuring a pair of .glasses of movement of a tape carrier, in which the equipotential is recorded on the carrier as a straight line and the parameters of movement of the carrier 1 are determined from the amplitude modulation of the reproduced signal.

A disadvantage of the known method is a decrease in the measurement accuracy due to the influence of destabilizing motion factors, for example, carrier skew.

The closest in technical essence and effect achieved to the invention is a method of measuring the motion parameters of a tape carrier, in which a control signal is shown symmetrically relative to the longitudinal line of the carrier in the form of electrostatic potential lines, while moving, the potentials of four points of the control signal are reproduced by movement scanning the latter with a beam of an electron beam tube with a metal fiber screen across the direction of movement of the carrier, time between shafts reproduced potentials sequence and the measured time intervals measured by the speed of movement of the carrier 2. .

This method has the same disadvantage as known.

The purpose of the invention is to improve the accuracy of the speed measurement and enhance the functionality by measuring the skew and taking into account the interaction between the velocity measurement and the media skew.

To achieve this goal, according to the measurement method, in which a control signal in the form of lines of electrostatic potential is applied to a stationary tape carrier symmetrically relative to the longitudinal line of the carrier, four potentials of the control signal are reproduced by scanning the cathode ray tube with a metal fiber screen across the direction of movement of the carrier, the time intervals between the sequence of reproducible potentials are measured and th time interval measured carrier movement speed pilot line elekrostaticheskogo I potential is applied in the form of two diverging acute angle potentsiosh rays along the beam by msduliruyut

linear law, and determine the skew angle, the longitudinal and transverse components of the speed of movement of the carrier rto expressions

, 4-47) gu

 -t jKiiKq- lil s

, - cosu-S) t i-q4-4, -cp3

v-,

. k V.v.S.

where 8 is the skew angle;

V - longitudinal component

carrier speeds; UE is the transverse component of the speed of movement of the carrier; potentials of four successively reproduced points of the control signal; time intervals between 1 st

and 2nd, as well as 3rd and 4th intersections;

v is half the angle of divergence of the rays of the electrostatic potential; K is the modulation coefficient of the electrostatic potential along the beam.

FIG. 1 shows the block diagram of the proposed device; Fig. 2 is a scheme for scanning a pilot signal by a beam of a cathode ray tube; in fig. 3 is the law of modulation of the potential of the control signal; on . FIG. 4 - the reproduced potentials of four successively reproduced points of the control signal. 5 Electron-beam tube 1 is installed perpendicularly rigidly fixed counter-electrode 2, on which the dielectric carrier 3 is slid with recorded 14 and on it the counter role was played with signals in the form of straight lines ON and OR, forming an acute angle L with a bisector. The potentials of the direct lines OR of the OR are modulated according to a linear law. A generator 5 of a triangular voltage is connected to the deflection system of the tube 1, the cathode of which is connected to the source 6 of high voltage. The counter-electrode 2 is connected to a resistor 7 and an amplifier 8, the outputs of which are connected to the transformer 9 amplitude pulses in the code and the limiter 10 amplitude. The output of the latter through the trigger 11 and the converter 12 of the time interval in 5 code is connected to the calculator 13. The calculator 13 is connected to the recorder 14. The tension rollers 15 are designed to reduce the perpendicular components of the carrier oscillations 3. 0 When the carrier 3 moves, the source 6 of the high-voltage source . An extension of the tube 1 is opened, the beam of which by the voltage of the generator 5 moves along the electrodes of the metal fiber screen. When a beam hits the electrode, their potential reaches a breakdown voltage, which results in the transfer of charge to moving carrier 3. The charge is proportional to the potential difference between the screen electrodes and charged parts of carrier 3. Transferred charge flows through the circuit: carrier 3 , counter electrode 2, resistor 7, device case. As the charge runs off, a sequence of pulses is formed on the 7th transmitter, the amplitude of which is proportional to the transferred charge. The tube's beam successively scans up and then down the electric drive when there is no screen carrier intersection of carrier 3, the electron beam crosses the OP line at a potential point, and then the ON line at a point with potential 2 2 The OA and AB points abscissa differ because carrier 3 is moved to a distance. After that, the electron beam intersects the ON line and the line of ORB points with potential f and t. When there is a skew carrier angle 5, the electron beam intersects the ON and op lines at points with potentials (f ,, cf, (f and cp4). From the load resistor 7, the pulse voltage is applied to the amplifier 8, from whose outputs through the converter 9 amplitudes in the sneaker and through elements 10-12 representing the time converter into the code, is fed to the inputs of the calculator 13. In the calculator 13, a program for calculating the skew angle, the longitudinal and transverse components of the illumination speed is performed. .-с ,, tif4- f) "u4,4 (f,) i ;, CpsU-fi SU7Ч4-Ц Ф V Utf4- M- fl VM-V.S. The invention allows to increase accuracy of measuring the velocity components by taking into account the effects of skew, as well as extend the functionality of the method of measuring by determining additional parameters of movement of the belt wear

ff

(put.f

sh

I

Claims (1)

METHOD FOR MEASURING TAPE CARRIER MOTION PARAMETERS, in which a control signal in the form of lines of electrostatic potential is applied symmetrically to a stationary tape carrier, the potentials of four points of the control signal are reproduced during movement by scanning the latter with a beam of a cathode ray tube with a metal fiber screen across the direction of movement of the carrier , measure the time intervals between the sequence of reproduced potentials and the measured int The time intervals measure the speed of the carrier, characterized in that, in order to improve the accuracy of measuring speed and expand the functionality, the lines of the electrostatic potential of the control signal are applied in the form of (two diverging at an acute angle | Rays, the potential along the beam is modulated linearly, and determine the skew angle, the longitudinal. and the transverse components of the carrier velocity according to the expressions '· 4> 3' e A® where o is the skew angle; | ; V is the longitudinal component W g of the carrier velocity; 1 ^ - transverse component | C of the carrier velocity; · potentials of four successively reproduced “points of the control signal; ^and P ^{trees of} time, between the first and second, as well as the third and fourth Intersections; Λ - half the angle of divergence of the beam of electrostatic potential; K is the modulation coefficient of the electrostatic potential along the beam. 1Ω53157>