SU858091A2

SU858091A2 - Method of measuring vibrations of moving electrostatic information carrier

Info

Publication number: SU858091A2
Application number: SU792848448A
Authority: SU
Inventors: Вадим Евгеньевич Лялин; Евгений Андреевич Лялин; Казимерас Миколо Рагульскис
Original assignee: Предприятие П/Я В-2769
Priority date: 1979-12-10
Filing date: 1979-12-10
Publication date: 1981-08-23

Description

Изобретение относитс к приборостроению , в частности к способам измерени колебаний движущегос элект ростатического носител информации, и может быть использовано дл определени динамической точности ленто-, прот жного механизма аппарата записивоспроизведени информации. По основному авт.св. № 568077 из .вестен способ, осуществл емый путем записи на носитель контрольного сигна ла в виде эквивалентной пр мой полосы воспроизведени последнего, определени по амплитудной модул ции величи ны колебаний носител , перпендикул рных к его плоскости, а по широтно-импульсной модул ции - величины попереч ных колебаний Г Недостаток способа состоит в том, что измер по данному способу перпендикул рные и поперечные колебани движущегос ленточного носител , нельз олреде.11ить продольные колебани последнего. Дп измерени продольных колебаний необходимо затрачивать дополнительное врем . Цель изобретени - сокращение времени колебаний носител . Поставленна цель достигаетс тем, что в способе при записи на носитель дополнительно нанос т эквипотенциальные окружности, центры которых совмещают с записанной эквипотенциальной полосой, воспроизвод т контрольный сигн. путем сканировани лучом электроннолучевой трубки с металловолоконным экраном по ширине носител , определ ют врем сканировани луча по хордам эквипотенциальной окружности и ширине эквипотенциаль- ной .полосы, а по формуле ЯлРЧ 7-7сЧ1Г -ч суд т о продольных колебани х носите-, . где Т. и Т. врем сканировани двух соседних лучей трубки по хордам эквипотенциальной окружности; . врем сканировани лучами двух трубок двух соседних строк по ширине эКвипотенциальной полосы; i - номер строки сканиро вани луча по экрану трубки; Тр - длительность импульс разверт1си луча трубки; Vfl- скорость перемещени носител ; С - отношение диаметра эквипотенциальной oкpyжнoctи к ширине эквипотенциальной полосы; а - эквипотенциальной полосы. Способ осуществл ют следующим образом. На носитель нанос т эквипотенциальную полосу вдоль носител и окружности, центры которых располагают на полосе (фиг.1). При воспроизведении путем постро ного сканировани лучом электроннолучевой трубки движущегос носител анализируют параметры воспроизведенного сигнала. Импульсы, получвнм 1е от воспроизведени одной строки, имеют вид, представлент.1й на |иг.2. Движущийс носитель подвержен колебани м перпендикул рным, т.е. колебани м в плоскости, перпендикул рной ег:о движению, поперечным, т.е. колебани м в плоскости носител , перпендикул рным направлению его движени , и, наконец, продольны т.е. колебани м в направлении движени носител . Второй импульс (фиг.2) образуетс во врем сканировани луча трубк по ширине эквипотенциальной полосы контрольного сигнала. На длительнос его оказывают вли ние поперечные колебани . При отсутствии поперечны колебанийThe invention relates to instrumentation, in particular, to methods for measuring oscillations of a moving electrostatic information carrier, and can be used to determine the dynamic accuracy of a tape-stretching mechanism of a recording device for reproducing information. According to the main auth. No. 568077 from the well-known method carried out by recording on a carrier of a control signal in the form of an equivalent direct reproduction band of the latter, determining, by amplitude modulation, the magnitude of carrier oscillations perpendicular to its plane, and for pulse width modulation - values transverse oscillations. The disadvantage of the method is that the measurement of the perpendicular and transverse vibrations of a moving tape carrier by this method cannot be done by means of longitudinal oscillations of the latter. DP measuring longitudinal oscillations need to spend extra time. The purpose of the invention is to reduce the carrier oscillation time. This goal is achieved by the fact that, in writing, equipotential circles are additionally deposited onto a carrier, whose centers are aligned with the recorded equipotential band, the control signal is reproduced. by scanning a beam of a cathode-ray tube with a metal fiber screen across the carrier width, determine the beam scanning time using the chords of the equipotential circle and the width of the equipotential band, and calculate the longitudinal oscillations of the bearing by the HF-7-7CCH1H formula,. where T. and T. are the times of scanning two adjacent beams of a tube along the chords of an equipotential circle; . the scan time of the beams of two tubes of two adjacent rows across the width of the e-equipotential band; i - line number of scanning the beam across the tube screen; Tr - the duration of the impulse to expand the beam of the tube; Vfl is the velocity of the carrier; C is the ratio of the diameter of the equipotential cutoff to the width of the equipotential strip; a - equipotential band. The method is carried out as follows. An equipotential strip is placed on the carrier along the carrier and a circle whose centers are located on the strip (Fig. 1). When playing by means of a scanning of a moving carrier by a beam of a cathode-ray tube, the parameters of the reproduced signal are analyzed. The pulses received from the reproduction of a single line are of the form 1 in. 2. A moving carrier is subject to perpendicular vibrations, i.e. oscillations in a plane perpendicular to it: on motion, transverse, i.e. oscillations in the plane of the carrier, perpendicular to its direction of movement, and, finally, are longitudinal, i.e. oscillations in the direction of movement of the carrier. The second pulse (Fig. 2) is formed during the scanning of the beam of the tube across the width of the equipotential band of the pilot signal. The lateral vibrations affect it. In the absence of transverse oscillations

./У ./Y

Л L

где Q - пмрина полосы; V скорость луча.where Q is the band of strip; V is the speed of the beam.

т - -гt - -r

I ; Т JI; T j

Claims

If the vectors V and coincide in direction, then the latency of pain is greater. 14 In the case when the scanning speed of the beam coincides with the direction of displacement of the carrier /, Г-O / VVH. otherwise . Ar “1” of Uj (Fig. 2) of the second pulse depends on the perpendicular oscillations of the carrier. The duration of the first and third pulses is constant and small, since the line forming the circle is close to zero. Their amplitude Ug is determined by the distance between the carrier and the tube. The formed bursts of three pulses amplify and separate the analog signal from the amplitude of the second pulses, inverse to the law of perpendicular oscillations of the carrier. The duration of the JX, second pulse is converted into a code and memorized. The selected first and third pulses are limited in amplitude and the pulse duration T is equal to the scan time of the tube beam along the DC chord (Fig. 1). This duration T is converted into a code, which is also memorized. The distance that the carrier traveled during the duration of the pulse TB of the sawtooth sweep current is equal to, r- The distance that the carrier must travel at a constant speed V (5 during 5p is equal to Longitudinal oscillations of the carrier in the absence of its transverse oscillations Oscillations are introduced by the correction factors TO / TJ. The corrected durations T are determined by more than the truth, and the factor is Gd / G- 1. Otherwise, less than by the truth, the Co multiplier is true for teaching /; 4f, the law of carrier oscillations during time p does not change, it can be perfectly lawfully extended to a slice of 0 equal to two radii 2 R. Given the correction factor, carrier longitudinal oscillations are determined by the formula -x- f V 4 r-Vc- (). where C 2R / a. The operation unit according to this formula determines the longitudinal oscillations of the carrier, and the recorder displays the law of their change. The tests of the proposed method showed the effectiveness of the technical solution. I Using the proposed method, one can measure oscillations of a moving tape carrier in three coordinates simultaneously, i.e. determine its position in the three-dimensional space. The method is simple, since it is based on the recording of a control waveform and reproducing it with a single reproducing tube. Furthermore, the method provides high accuracy, reliability and speed. Invention The method for measuring oscillations of a moving electrostatic information carrier according to the author. No. 568077, characterized in that, for the purpose of measuring a reduction in time. when recording on the carrier, potential circles are additionally deposited whose centers are aligned with the recorded equipotential band, reproduce the control signal by scanning the beam of the electron beam tube with a metal fiber screen across the carrier width, determine the beam scanning time along the equipotential circle chords and the width of the equipotential band width. Wear a longitudinal oscillation, de T, for a formula lt / SN-7Pr-° P, and so on. 1 scan time of two adjacent tube rays along the chords of the equipotential circle; g 1 zhvrem scanning two beams of tubes, two adjacent lines across the width of the equipotential band; i is the line number of the beam scanning across the tube screen; Cp - the duration of the pulse sweep of the beam tube; V is the velocity of the carrier; c is the ratio of the diameter of the equipotential circle to the width of the equipotential strip; a is the width of the equipotential band. Sources of information that are considered in the examination. 1. USSR author's certificate 568077, cl. G 1.1 B 27/10, 01,04.76 rototype).

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