US3873912A - Method and apparatus for forming on a moving magnetic material a magnetized mark of prescribed width regardless of variations of speed of moving magnetic body - Google Patents

Method and apparatus for forming on a moving magnetic material a magnetized mark of prescribed width regardless of variations of speed of moving magnetic body Download PDF

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Publication number
US3873912A
US3873912A US405529A US40552973A US3873912A US 3873912 A US3873912 A US 3873912A US 405529 A US405529 A US 405529A US 40552973 A US40552973 A US 40552973A US 3873912 A US3873912 A US 3873912A
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magnetic material
magnetizing
pulse
coil
signal
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US405529A
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English (en)
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Toshihiro Mori
Seigo Ando
Katsujiro Watanabe
Takeo Yamada
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JFE Engineering Corp
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Nippon Kokan Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/04—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
    • G01B7/042—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
    • G01B7/046—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length using magnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
    • G01P3/54—Devices characterised by the use of electric or magnetic means for measuring linear speed by measuring frequency of generated current or voltage

Definitions

  • An apparatus for locally magnetizing moving magnetic material which comprises a coil for locally magnetizing the traveling magnetic material and a coil for detecting the magnetic flux of a locally magnetized spot, both coils being linearly arranged aside the magnetic material in its traveling direction; a pulse current generator for supplying the magnetizing coil with pulse current; an extraction device for extracting a signal denoting the speed of the traveling magnetic material out of a detection signal delivered from the magnetized spot-detecting coil; and a control device for controlling by the extracted signal the time width of output pulse current from the pulse current generator so as to cause the locally magnetized spot to have a fixed length extending along the magnetic material regardless of its traveling speed.
  • This invention relates to a method and apparatus for locally magnetizing moving magnetic material at a plurality of equidistant points linearly arranged in the traveling direction of the magnetic material.
  • the customary practice of, for example, measuring the length of the press-rolled section of steel plating while it is moving on the press roll line has been locally to magnetize the traveling steel plating at a plurality of equidistant points linearly arranged in the running di' rection of the steel plating, count the number of the cally magnetized spots and convert the counted number of said spots into the length of the press-rolled section of the steel plating.
  • the conventional methods of locally magnetizing moving magnetic material is the one which consists in introducing alternating current through'a magnetizing coil positioned close to, for example, traveling steel plating being press-rolled.
  • the magnetizing coil is connected to a source of alternating current through the associated switch, and the operation of the switch is turned off when the alternating current falls to a zero level. This process.
  • Magnetization by alternating current calls for introduction of a large amount of electric energy through the magnetizing coil, presenting the drawbacks that the magnetizing coil has to be formed of a thick wire, and a locally magnetized spot on steel plating unavoidably becomes unduly large to obstruct the accurate measurement of the length of the press-rolled section of the steel plating.
  • a method'for locally magnetizing a moving mag netic material which comprises providing a magnetizing coil aside of the traveling magnetic material, and supplying the traveling magnetic material with pulse current having a fixed time width at a prescribed interval.
  • a method of locally magnetizing moving magnetic material wherein a coil for locally magnetizing the traveling magnetic material and at least one detector for detecting the locally magnetized spots are linearly arranged at a prescribed interval aside of the magnetic material in its traveling direction; the magnetizing coil is supplied with pulse current having a prescribed cyclic period; a signal denoting the speed of the running magnetic material is extracted out of a detection signal obtained from the locally magnetized spot detector; and the pulse current has its time width controlled by the extracted signal so as to cause the locally magnetized spot to have a fixed length extending along the magnetic material, regardless of its traveling speed.
  • an apparatus for locally magnetizing moving magnetic material which comprises a magnetizing coil disposed aside of the traveling steel plating; and a device for supplying the magnetizing coil with pulse current having a-fixed time width at a prescribed interval.
  • an. apparatus for locally magnetizing moving magnetic material which comprises a magnetizing coil. positioned close to the traveling magnetic material and at least one detector for detecting the locally magnetized spots; a pulse generator for supplying the magnetizing coil with pulse current having a fixed cyclic period; an extraction device for extracting a signal denoting the speed of the running magnetic material out of a detection signal obtained from the locally magnetized spot detector; and a control device for controlling the time width of pulse current by the extracted signal so as to render the length of the locally magnetized spot having a fixed length extending along the magnetic ma terial, regardless of its traveling speed.
  • FIG. 1 schematically shows a method and apparatus for locally magnetizing moving magnetic material according to an embodiment of this invention
  • FIGS. 2A and 28 present the wave forms of signals by way of illustrating the operation of the apparatus of FIG. 1;
  • FIG. 3 is a block circuit diagram of an apparatus according to another embodiment of the invention for locally magnetizing moving magnetic material
  • FIGS. 4A, 4B, 4C, 4D and 4E indicate the wave forms of signals appearing at various sections of the circuit arrangement of FIG. 3;
  • FIGS. 5A, 5B and 5C present the wave forms of signals by way of illustrating the operation of the correction voltage-generating section of FlG. 3;
  • FIGS. 6A, 6B, 6C and 6D indicate the wave forms of signals by way of illustrating the operation of the appa ratus having its circuitry arranged as shown in FIG. 3 for local magnetization of moving magnetic material;
  • FIG. 7 is a block circuit diagram of an apparatus ac-- cording to still another embodiment of the invention for locally magnetizing moving magnetic material.
  • reference numeral 1 denotes a test object of magnetic material, for example, steel plating traveling at a fixed speed in the direction of the indicated arrow.
  • a U-shaped core 2 disposed close to one side of the steel plating l is wound with a magnetizing coil 3. Both ends of the magnetizing coil 3 are connected to a source of direct current 5 having the indicated polarity through a switching device 4.
  • the switching device 4 has its operation controlled by a control signal supplied by a switch controller 6.
  • the switch controller 6 may be formed of an astable multivibrator so as to supply the base of a transistor constituting said transistor switch 4 with a signal for putting it in or out of operation.
  • Parallel connected to both ends of the magnetizing coil 3 is a series circuit consisting of a resistor 7 and a diode 8 having an opposite polarity to the power source 5.
  • the switch controller 6 When, in an apparatus for locally magnetizing moving magnetic material arranged as described above, the switch controller 6 is operated to close the switch 4 and immediately after to open it, then pulse current having the wave form of FIG. 2B is supplied to the magnetizing coil 3 from the source of direct current 5.
  • a pulseshaped magnetic flux produced in the coil 3 by the above-mentioned pulse current causes that portion of the steel plating l which is disposed near the core 2 to be self magnetized in the form of a pulse as shown in FIG. 2A.
  • the steel plating 1 is locally magnetized to an extent corresponding to its quality and thickness, the distance between coil 3 and steel plating l, and the magnitude of the pulse current passing through the magnetizing coil 3.
  • steel plating 1 used, for example, as a test object runs on the press roll line at large varying speeds, causing the length of locally magnetized spots on said test object to vary with its traveling speed. This event leads to the displacement of the center of locally magnetized spots, giving rise to errors in measuring the press-rolled length of the test object from such locally magnetized spots.
  • the magnetized spot on the moving steel plating 1 has its length along the steel plating 1 increased to an extent of d(m) expressed by the equation l above from that attained when the steel plating l is magnetized while standing at rest.
  • the increased length Ah of the magnetized spot formed on the 'moving steel plating I may be expressed by the following equation:
  • FIG. 3 There will now be described by reference to FIG. 3 the embodiment of this invention where a magnetized spot can be formed on traveling steel plating 1 in a fixed length by the aforesaid principle, regardless of the speed of the traveling steel plating l.
  • the parts of FIG. 3 the same as those of FIG. 1 are denoted by the same numerals.
  • a coil 11 wound about a core 12 to detect the position of magnetized spots is disposed aside of steel plating 1 running in the direction of the indicated arrow at a point spaced for a prescribed distance, for example, one meter from the corresponding magnetizing coil 3.
  • Other magnetic sensitive devices such as SMD, a Hall element and the like can also be used in substitution for the detection coil 11.
  • a detection signal generated by the detection coil 11 form-shaping circuit 14.
  • An output signal from the amplifier 13 has one sine wave cycle, as shown in FIG. 4A, for each magnetized spot.
  • the wave form-shaping circuit 14 may consist'ofa known type comprising a rectangular wave-generating circuit including, for example, a Schmidt trigger circuit for producing a rectangular wave signal shown in FIG. 4B; a differentiation circuit for generating an output signal having a wave form illustrated in FIG. 4C by differentiating a rectangular wave signal of FIG. 48; a clipping circuit for extracting an impulse signal bearing a negative direction out of an output signal from the differentiation circuit; and an inverter.
  • An output impulse signal from the wave formshaping circuit 14 having a wave from indicated in FIG.
  • pulse signal generator 15 may consist of a monostable mutitivibrator.
  • the pulse signal generator 15 gives forth a pulse signal having a fixed time width as indicated in FIG. 4E upon receipt of the detection signal of FIG. 4A.
  • the pulse signal is integrated by an integrator 16, an output signal from which is supplied to a clipping circuit 17.
  • This monostable multivibrator 18 comprises two transistors 19 and '20 and has the time constant of its oscillation defined by a resistor 21 connected to the base of the transistor 20 and a capaciter 22.
  • An output signal from the monostable multivibrator 18 is supplied to the switching device 4 from the collector of the transistor 20.
  • Part of an output signal from the pulse signal generator 15 is delivered to a differentiation circuit consisting of a capacitor 23 and resistor 24. Only the negative component of an output differentiated pulse from the differentiation circuit is sent to the collector of the transistor 19 through a diode 25.
  • a start pulse generator 27 is connected through a switch 26 to one side of the capacitor 23.
  • the start pulse generator 27 gives forth a start pulse through the switch-26, then this start pulse is conducted to the differentiation circuit consisting of the capacitor 23 and resistor 24.
  • the negative one is impressed on the monostable multivibrator 18 through the diode 25, and a switch control pulse is supplied to a switching device 4 from the collector of the transistor 20.
  • the switching device 4 is operated for a prescribed length of time to introduce pulse current into the magnetizing coil 3, thereby locally magnetizing the steel plating l in a prescribed length.
  • the magnetized spot moves together with the steel plating l and passes the magnetized spot detector 11.
  • an electric signal is generated by the coil of said detector 11 in an amount proportionate to the amount of the residual magnetic flux of the magnetized spot and the intersecting speed of coil 11 with the flux.
  • the electric signal thus obtained is subjected, as previously described, to amplification and wave shaping to be converted into a pulse signal.
  • This pulse signal is conducted from the pulse signal generator 18 to the switching device 4.
  • the start pulse generator 27 generates a start pulse under the above-mentioned con- I dition, then magnetized spots are automatically formed on steel plating l equidistantly, provided the steel plating 1 runs at a fixed speed.
  • the pressrolled length 1 (m) of steel plating 1 passing the detection coil during that time can be measured as follows:
  • a pulse counter 30 counts the number N of pulses generated by the pulse signal generator 15. The distance between the magnetizing coil 3 and detection coil 11 is multiplied by the counted number of pulses in a calculator 31 to obtain the press-rolled length I (m) of the steel plating 1. A signal denoting this length I (m) is supplied to a display device 32 for indication.
  • the length I1 (111) of the magnetized spot on the traveling steel plating 1 varies with its speed. leading to changes in the exact half length 11,, (m) ofthe magnetized spot and the distance D (m) be tween two adjacent magnetized spots. Therefore, the distance D, between the magnetizing coil 3 and magnetized spot-detecting coil 11 presents a slight difference .r (m) from the actually measured distance D, (m) between two adjacent magnetized spots on the running steel plating I.
  • Nr (n1) netizing pulse current, then there is obtained direct current voltage whose level corresponds to the frequency l/T (Hz) of a pulse signal received.
  • an increase All (m) in the length of the magnetized spot may be indicated as k (m) from the equation (7).
  • the length 11 (m) of the magnetized spot formed on the traveling steel plating 1 and the displacement (m) of the center of the magnetized spot are fixed at (h, k) and (It/2) respectively from the equation (8). Consequently, an actually measured distance D (m) between two adjacent magnetized spots is also fixed at (D, k,) as seen from the equation (10).
  • FIGS. 6A, 6B, 6C and 6D present the wave forms of signals generated at various parts of the embodiment of FIG. 3 to correct the time width of magnetizing pulse current.
  • FIG. 6A is a graph showing the relationship of operating time and the speed of steel plating 1 traveling, for example, on a press roll line.
  • the press roll line speed v (m/sec.) of the steel plating 1 presents variations during the operating time.
  • pulses generated by the pulse signal generator 15 also change in frequency as indicated in FIG. 6B, and output voltage from the integrator 16 has its level changed shown in FIG. 6C.
  • magnetizing current running through the magnetizing coil 3 will have, as shown in FIG. 6D, a time width inversely proportionate to the speed of the moving steel plating 1.
  • equation (2) As seen from the equation (2),
  • the length of the magnetized spot formed on the running steel plating 1 indicates an increase Ah proportionate to its speed v and the time width 1 of magnetizing pulse current.
  • Ah the locally magnetizing moving magnetic material.
  • two magnetized spot-detecting coils 11 and 11a are linearly arranged at a prescribed space aside of steel plating 1 in its traveling direction. It is advised that an interval between both detecting coils l1 and 11a be so chosen as to be saved from the effect of variations in the, speed of the running steel plating 1, namely, be set at, for example, 10 to 100 mm.
  • Alternating current generated in the detection coil 11a is amplified by an amplifier 13a and conducted to a wave form-shaping circuit 14a constructed in the same manner as the aforementioned wave form-shaping circuit 14.
  • An impulse signal as shown in FIG. 4D is supplied from the wave form-shaping circuit 14a to a pulse signal generator 150.
  • This pulse signal generator 15a gives forth a pulse signal as shown in FIG. 4E according to an impulse received.
  • Two output pulses from both pulse signal generators 15 and 150 are transmitted to the set terminal of a flip-flop circuit 33 and the reset terminal thereof respectively.
  • a switch 26 When, under the above-mentioned arrangement, a switch 26 is closed to supply a start pulse from the start pulse generator 27 to the switching device 4, then said device 4 is rendered conducting by a start pulse for a prescribed length of time.
  • a magnetizing pulse is delivered from the source of direct current 5 to the magnetizing coil 3.
  • the magnetized spot formed on the traveling steel plating 1 by the magnetizing pulse is brought to a first or forward detection coil 11 together with the moving steel plating.
  • the first detection coil 11 generates a signal according to the magnetized spot.
  • the pulse signal generator 15 supplies a pulse signal to the set terminal of the flip-flop circuit 33, which is thus set to give forth an output signal to the switching device 4 for its actuation.
  • the second detection coil 11a When the magnetized spot formed on the steel plating l by the start pulse is brought to a second or rear detection coil 11a upon further movement of the steel plating 1, then the second detection coil 11a produces a detection signal.
  • the pulse signal generator 15a supplies a pulse to the reset terminal R' of the flip-flop circuit 33 to reset it, thereby extinguishing an output from the flip-flop circuit 33 and rendering the switching device 4 inoperative. Namely the switching device 4 is actuated only while the flip-flop circuit 33 is set, causing magnetizing pulse current to run through the magnetizing coil 3.
  • the set period of the flip-flop circuit 33 will be shortened in inverse proportion to the speed of the traveling steel plating 1. Accordingly, the faster the speed of the running steel plating l, the shorter the time width of the magnetizing pulse current.
  • the foregoing description relates to the case where this invention was applied in measuring the press-rolled length of steel plating.
  • the present apparatus which accurately indicates the position of a magnetized spot is also applicable in exactly detecting any desired point on steel plating traveling on the press roll line.
  • the apparatus which can also measure the speed of traveling steel plating may be used as an accurate speedmeter.
  • An apparatus for locally magnetizing moving mag netic material comprising: I
  • a magnetizing coil for forming a magnetized mark on the moving magnetic material
  • At least one detector for detecting the magnetized mark, said magnetizing coil and detector being linearly arranged a fixed distance apart aside the magnetic material in its traveling direction;
  • control means responsive to the extracted signal for controlling the time width of the pulse current so as to renders-aid time width inversely proportional to the speed of the moving magnetic material thereby causing the magnetized mark to have a fixed length regardless of the speed of the material.
  • the means for supplying pulse current to the magnetizing coil comprises a source of direct current connected to the magnetizing coil; switching means connected between the source of direct current and the magnetizing coil; a switch controller for generating a signal for controlling the operation of the switch; and a series circuit including a resistor and a diode of opposite polarity to the source of direct current, the series circuit being connected in parallel with the magnetizing coil.
  • the magnetized mark detector comprises a core disposed near the magnetic material and a coil wound about the core;
  • the extraction means comprises a wave form shaping circuit for producing one impulse per magnetized mark upon receipt of a detection signal from the detection coil, a pulse signal generator for generating a pulse signa] having a prescribed timewidth upon receipt of an impulse signal from the wave form shaping apparatus and an integrator for generating a voltage having a level proportional to the density of the pulse signals;
  • the pulse current-supplying means comprises a source of direct current connected to the magnetizing coil, a switching device connected between the source of direct current and magnetizing coil, a monostable multivibrator for generating a signal for controlling the operation of the switching device and a series circuit including a resistor and a diode of opposite polarity to the source of-direct current, the series circuit being coupled in parallel with the magnetizing coil; and the control means for controlling the time width of pulse current comprises a clipping circuit for supplying an output signal from the
  • An apparatus for locally magnetizing moving magnetic material which further comprises a pulse counter for counting the number of pulses delivered from the pulse signal generator; a multiplying circuit coupled to the pulse counter for generating a signal denoting the treated length of the magnetic material by multiplying the counted number of pulses by a prescribed coefficient; and a display device for indicating the treated length of the magnetic materialupon receipt of an output signal from the multiplying circuit.
  • An apparatus for locally magnetizing moving magnetic material comprising:
  • a magnetizing coil for locally magnetizing the moving magnetic material
  • a first and a second detector for detecting magnetized marks formed on the moving magnetic material, the coil and both detectors being linearly arranged a fixed distance apart aside the magnetic material in its traveling direction, one detector being further from the coil than the other:
  • control circuit for supplying the control signal to said supply means to connect the direct current to the magnetizing coil upon receipt of a detection signal from the first detector and for cutting off the direct current thus supplied upon receipt of a detection signal from the second detector thereby causing the magnetized mark to have a fixed length regardless of the speed of the material.
  • control circuit comprises a flip-flop circuit which is set by a detection signal from the first detector and reset by a detection signal from the second detector.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
US405529A 1972-10-16 1973-10-11 Method and apparatus for forming on a moving magnetic material a magnetized mark of prescribed width regardless of variations of speed of moving magnetic body Expired - Lifetime US3873912A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121155A (en) * 1976-12-02 1978-10-17 The Charles Stark Draper Laboratory, Inc. Position readout device
US4409852A (en) * 1980-09-08 1983-10-18 Bridgestone Tire Company Limited Method of measuring stretch of conveyor belt
US4444064A (en) * 1982-06-14 1984-04-24 General Electric Company Electromagnetic torque measuring instrumentation for a rotating shaft
US4465975A (en) * 1980-09-19 1984-08-14 The B. F. Goodrich Company Scanning apparatus and method for measuring a magnetic field produced by a sample
US4560928A (en) * 1979-01-05 1985-12-24 British Gas Corporation Velocity or distance measuring apparatus using magnetic dipoles
US4578644A (en) * 1983-10-07 1986-03-25 American Multimedia, Inc. Method and apparatus for testing the presence of magnetic storage medium on a given side of a tape
US4657197A (en) * 1983-10-07 1987-04-14 American Multimedia, Inc. Cassette tape loader apparatus for testing the presence of magnetic storage medium on a given side of a tape
US4709208A (en) * 1985-12-19 1987-11-24 Kerr Measurement Systems, Inc. Magnetic mark detector system
US4931727A (en) * 1987-10-28 1990-06-05 Nippon Soken, Inc. Moving body speed detecting device which produces and detects a magnetic pole on the body surface
US5243128A (en) * 1990-03-07 1993-09-07 Caoutchouc Manufacture Et Plastioues S.A. Sewer cleaning apparatus
US20100301846A1 (en) * 2009-06-01 2010-12-02 Magna-Lastic Devices, Inc. Magnetic speed sensor and method of making the same
CN103170528A (zh) * 2013-03-19 2013-06-26 全文宪 一种冲床数显计数器
CN103486956A (zh) * 2013-10-10 2014-01-01 中国计量科学研究院 一种实现高精度测量竖直移动方向的装置及方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2379047A1 (fr) * 1977-01-26 1978-08-25 American Can Co Detecteur de boite courte destine a une machine de production de corps de boites
JPS5648501A (en) * 1979-09-28 1981-05-01 Sumitomo Electric Ind Ltd Length measuring device
DE3812458A1 (de) * 1988-04-14 1989-10-26 Masinostroitelen Eksperimental Vorrichtung zur magnet-impuls-behandlung von ferromagnetischen werkstoffen

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US3015062A (en) * 1959-05-21 1961-12-26 Designers For Industry Inc Measuring device
US3432747A (en) * 1967-01-23 1969-03-11 Api Instr Co Spot recording and pickup methods and apparatus for the determination of hardness of relatively moving magnetic material without contacting the same

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FR1084883A (fr) * 1953-10-12 1955-01-25 Procédé de mesure de l'allongement des tôles dans les laminoirs, ou applications similaires

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US3015062A (en) * 1959-05-21 1961-12-26 Designers For Industry Inc Measuring device
US3432747A (en) * 1967-01-23 1969-03-11 Api Instr Co Spot recording and pickup methods and apparatus for the determination of hardness of relatively moving magnetic material without contacting the same

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121155A (en) * 1976-12-02 1978-10-17 The Charles Stark Draper Laboratory, Inc. Position readout device
US4560928A (en) * 1979-01-05 1985-12-24 British Gas Corporation Velocity or distance measuring apparatus using magnetic dipoles
US4409852A (en) * 1980-09-08 1983-10-18 Bridgestone Tire Company Limited Method of measuring stretch of conveyor belt
US4465975A (en) * 1980-09-19 1984-08-14 The B. F. Goodrich Company Scanning apparatus and method for measuring a magnetic field produced by a sample
US4444064A (en) * 1982-06-14 1984-04-24 General Electric Company Electromagnetic torque measuring instrumentation for a rotating shaft
US4657197A (en) * 1983-10-07 1987-04-14 American Multimedia, Inc. Cassette tape loader apparatus for testing the presence of magnetic storage medium on a given side of a tape
US4578644A (en) * 1983-10-07 1986-03-25 American Multimedia, Inc. Method and apparatus for testing the presence of magnetic storage medium on a given side of a tape
US4709208A (en) * 1985-12-19 1987-11-24 Kerr Measurement Systems, Inc. Magnetic mark detector system
US4931727A (en) * 1987-10-28 1990-06-05 Nippon Soken, Inc. Moving body speed detecting device which produces and detects a magnetic pole on the body surface
US5243128A (en) * 1990-03-07 1993-09-07 Caoutchouc Manufacture Et Plastioues S.A. Sewer cleaning apparatus
US20100301846A1 (en) * 2009-06-01 2010-12-02 Magna-Lastic Devices, Inc. Magnetic speed sensor and method of making the same
CN103170528A (zh) * 2013-03-19 2013-06-26 全文宪 一种冲床数显计数器
CN103486956A (zh) * 2013-10-10 2014-01-01 中国计量科学研究院 一种实现高精度测量竖直移动方向的装置及方法
CN103486956B (zh) * 2013-10-10 2015-12-23 中国计量科学研究院 一种实现高精度测量竖直移动方向的装置及方法

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GB1438805A (en) 1976-06-09
DE2351868A1 (de) 1974-05-02
DE2351868B2 (de) 1978-10-05
JPS4962156A (de) 1974-06-17
FR2203148B1 (de) 1977-09-30
DE2351868C3 (de) 1979-05-31
FR2203148A1 (de) 1974-05-10

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