WO1992015844A1 - Transducteur magnetostrictif de position a sortie de codage emule - Google Patents

Transducteur magnetostrictif de position a sortie de codage emule Download PDF

Info

Publication number
WO1992015844A1
WO1992015844A1 PCT/US1992/001956 US9201956W WO9215844A1 WO 1992015844 A1 WO1992015844 A1 WO 1992015844A1 US 9201956 W US9201956 W US 9201956W WO 9215844 A1 WO9215844 A1 WO 9215844A1
Authority
WO
WIPO (PCT)
Prior art keywords
wave guide
pulses
mov
setf
interrogation
Prior art date
Application number
PCT/US1992/001956
Other languages
English (en)
Inventor
Steven S. Yauch
Wade D. Peterson
Lawrence J. Russell
Original Assignee
Mts Systems Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mts Systems Corporation filed Critical Mts Systems Corporation
Publication of WO1992015844A1 publication Critical patent/WO1992015844A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/247—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using time shifts of pulses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/48—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means
    • G01D5/485—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means using magnetostrictive devices

Definitions

  • the present invention relates to linear position magnetostrictive transducers, and more
  • Magnetostrictive linear position transducers are robust, high resolution instruments which have proven to be useful in many measurement and control applications.
  • Commercial magnetostrictive transducers have been available in a number of mechanical and electrical configurations. Transducers are available with 0-10 Volt, or 4-20 mA, analog signal outputs where the analog level has indicated the measured distance. Some transducers have been available with a timed TTL pulse output where the analog time interval indicated the measured distance. It is expected that
  • magnetostrictive devices will become more commonly used in applications which currently rely on incremental encoder technologies to transduce position into an analog output voltage. Adoption of magnetostrictive transducers will be facilitated by providing sensors which emulate or mimic industry standard interface protocols, particularly current mode signalling
  • a pulse generator is used to generate a current pulse in the waveguide.
  • the position magnet interacts with the waveguide magnetic field, generating an acoustic reaction wave in the waveguide at the location of the position magnet.
  • the time of flight of the acoustic wave indicates the position of the magnet in relation to a "mode converter" which is attached to he waveguide and translates the mechanical energy of the acoustic echo pulse into an electrical signal.
  • mode converter which is attached to he waveguide and translates the mechanical energy of the acoustic echo pulse into an electrical signal.
  • the time intervals between excitation of the wave guide to the detection of the echo controls the application of a DC reference voltage to an analog filter system which, in turn, generates an averaged DC level indicating position. In this fashion the returned acoustic pulse develops a signal which is converted to an output voltage level which indicates position.
  • the echo pulse is used to initiate the next interrogation or excitation pulse applied to the waveguide. In this sense the return echoes are recirculated.
  • the time measurements of multiple recirculations can be averaged to enhance resolution.
  • This Tellerman patent also teaches the use of a counter based interval timer.
  • the use of a counter based interval timer In general, the
  • interrogation pulse starts a counter which collects counts from a clock source. The counting process is stopped with a return echo. In this fashion, the time of flight of the sonic pulse is translated into a
  • the count is then converted into a corresponding analog voltage.
  • This Tellerman patent also teaches a time domain filtering technique which sets the duration of an "inhibit timer" based upon the historical output of the transducer.
  • the raw count data is used to set an "inhibit" time interval which is slightly shorter than the expected echo delay time.
  • the output of the mode converter is ignored until the inhibit time has elapsed.
  • This inhibit time is not velocity dependent although it does vary as a function of magnet position.
  • this time domain filtering technique limits the maximum slew rate of the magnet.
  • none of the representative prior art magnetostrictive transducers generates a quadrature output, indicating position. Also, none of the prior art transducers provide a burst mode or index feature, permitting the controller to access the absolute nature of the transducer.
  • the present invention permits the utilization of
  • magnetostrictive transducers with controllers which rely on, or expect current mode quadrature pulses to indicate position.
  • the user imbeds the transducer module in a measurement or control application where position information is required by a user supplied controller.
  • the transducer module itself is partitioned into a magnetostrictive sensor module, and an output conversion module.
  • the sensor module is of conventional design and it provides time domain logic level signals
  • the sensor module interrogates the waveguide in response to logic level interrogation signals supplied by the output conversion module.
  • the senor is connected to counter-control logic.
  • the counter-control logic develops a "raw count” number from multiple interrogations of the waveguide. This raw count data is transferred to the microprocessor under software
  • the microprocessor combines the user parameter information with the raw count data to generate,
  • quadrature pulse count, and quadrature velocity data The quadrature data is transferred to a quadrature pulse generator which translates this data into standard square-wave-in-quadrature pulses, which are supplied to the user's controller system through a wire interface shown as channel A and channel B and channel Z.
  • a quadrature pulse generator which translates this data into standard square-wave-in-quadrature pulses, which are supplied to the user's controller system through a wire interface shown as channel A and channel B and channel Z.
  • Three of the main processes performed by the microprocessor are: "interrogation and recirculation control", “math conversion into quadrature data”, and “generation of quadrature pulses". These processes are independent and their independence is an important aspect of the microprocessor.
  • the illustrative transducer also provides an "index" channel output and a "burst" mode.
  • the user may position the magnet at any position along the active stroke of the waveguide, and record this position as an index position by toggling an appropriate switch.
  • the count value corresponding to the "indexed" position is retained in a non-volatile memory.
  • each time the magnet traverses the indexed location the system emits an index pulse on an output channel of the transducer. This feature is important in many machine control environments.
  • Burst mode permits the user's controller to access the absolute nature of the underlying
  • the quadrature chaanels are toggled at a fixed frequency to deliver a set number of pulses to the controller.
  • the number of pulses is directly proportional to the
  • the exemplary transducer also includes structures to monitor the propagation velocity gradient of the waveguide. Although propagation velocity is relatively constant for an individual waveguide, it may vary slightly from waveguide to waveguide. For high accuracy and high resolution applications, waveguide gradient is individually measured and the electronics are matched to the specific waveguide. In the present invention the user may define a fixed distance along the waveguide and the transducer will measure the actual gradient exhibited by the transducer in that particular application. This measured gradient value may also be stored in non-volatile memory and used for quadrature calculations.
  • FIG 1 is a system level schematic diagram depicting the transducer embedded in a user application
  • FIG 2 is a block level schematic diagram depicting the elements of the magnetostrictive sensor module
  • FIG 3 is a block level schematic diagram depicting the partitioning of digital hardware, within the output conversion module;
  • FIG 4 is a schematic diagram depicting an illustrative embodiment of the invention, the figure is divided into panels FIG 4A through FIG 4J;
  • FIG 5A is a flow chart showing the
  • microprocessor initialization routine executed upon the start of the system
  • FIG 5B is a flow chart showing the three main microprocessor routines, which are executed
  • FIG 5C is a flow chart showing the
  • FIG 5D is a flow chart showing the interrupt routine for the interrogation and recirculation cycle
  • FIG 5E is a flow chart showing the
  • microprocessor routine for mathematical conversion of the raw count data received from the interrogation and recirculation cycle
  • FIG 5F is a flow chart showing the
  • FIG 5G is a flow chart showing the
  • microprocessor routine for setting a zero point to generate an index pulse
  • FIG 5H is a flow chart showing the
  • microprocessor routine for programming a gradient of the wave guide
  • FIG 51 is a flow chart showing the
  • FIG 1 depicts the magnetostrictive transducer module 10 embedded in a measurement and control
  • the user supplies an appropriate bipolar power supply 14 and an appropriate control system 16 which utilizes the output of the transducer module 10.
  • the user also locates the measurement waveguide 12 in the application and provides a suitable mount for the magnet 18.
  • the transducer module 10 is partitioned into a magnetostrictive sensor module 20 and an output conversion module 22 within suitable housings.
  • FIG 2 depicts the sensor module 20.
  • This module includes the magnetostrictive waveguide 12 and the associated pulse generator circuitry 28 and mode converter 32. These interrogate the waveguide to determine the location of the magnet 18, in response to a logic level "interrogation" pulse, supplied on
  • connection 26 and return a logic level "echo" signal, on connection 24 after a delay which indicates the location of the magnet.
  • the sensor module interrogates the waveguide 12, by generating a magnet field around the waveguide through the application of a current pulse.
  • the current pulse is generated in response to an
  • the sensor module also receives the resultant acoustic echoes, with a suitable mode converter 32.
  • the mode converter 32 is physically coupled to the waveguide. This device converts the mechanical energy of passing sonic pulses into a
  • FIG 3 shows the output conversion module 22.
  • the conversion module 22 is partitioned as shown in the figure with certain system functions performed in software, while other functions are performed
  • This module interfaces to the sensor module 20 through logic level “interrogation” and “echo” signals, and delivers synthesized RS 422 quadrature pulses and other information to the user's control system.
  • Quadrature signals are current mode signals typically delivered to twisted wire pairs coupled to the user's controller.
  • Channels A and B are 90 degrees out of phase and the phase relation between the channels indicates the direction of magnet motion.
  • the rate at which the quadrature pulses are delivered encodes the speed of the magnet.
  • velocity data is computed and an inherent lag exists between the quadrature signal and the actual motion of the magnet.
  • Channel Z is devoted to index data.
  • An RS 422 current pulse is delivered to channel Z each time the magnet sweeps by the user defined index point. Burst mode toggles channel A and B at a fixed frequency and supplies a number of pulses proportional to the distance between the current magnet position and the index point.
  • counter control logic in the counter-control logic 32 issues the interrogation signals, which result in the application of excitation pulses to the waveguide.
  • the control logic also responds to mode converter "echo" signals resulting from the reception of acoustic pulses formed in reaction to excitation pulses. Typically the received echo will be recirculated to generate the next interrogation pulse.
  • a counter collects clock pulses. After a fixed number of
  • the counter will contain a number of clock counts called the "raw count”, which corresponds to the time interval between successive excitations and echoes.
  • the value of the raw count depends in part on the number of "recirculations", and in part on the position of the magnet.
  • the raw count data is transferred to the microprocessor 30 under software control. Once the raw data is transferred, the time interval measurement and recirculation processes resume.
  • the microprocessor 30 computes a corresponding quadrature count and quadrature frequency. Once computations are completed, this information is down loaded to a
  • programmable quadrature pulse generator 34 which forms the RS 422 wave forms, delivered to the user's
  • FIG 4 An illustrative hardware embodiment is depicted in FIG 4.
  • FIG 4 has been divided into various panels which represent a preferred embodiment of the
  • transducer however, it should be appreciated that alternate components and hardware partitioning can be adopted by one of skill in the art without departing from the scope of this invention.
  • the system is built around the Intel 8031 single-component microcomputer and related peripherals.
  • the computations performed in the output conversion module require both program memory (firmware) and user supplied parameter data.
  • Non-volatile memory is provided for storage of certain user defined parameters.
  • DIP switches are provided to permit entry of user data, and for
  • FIG 4A identifies certain signal naming conventions and show the use of a de-multiplexing chip to decode the address lines of the Intel 8031AH
  • microcontroller corresponding to CPU 30.
  • FIG 4B shows two memory parts.
  • the 27128 is a non-volatile memory for storing program firmware and correspond to 36.
  • the 5C2568 is a static RAM used for scratch pad memory for the CPU 30.
  • FIG 4C depicts the Intel 8254 programmable interval timer (PIT) forming a portion of the quadrature pulse generator 34.
  • This component may be used as either a timer or counter. In this application it is treated as a port and the number of quadrature pulses required for output is written as the initial count, to the counter. The rate at which these counts are
  • FIG 4D depicts a semi custom programmable logic array (PAL) which performs a number of Boolean
  • This PAL cooperates with the PIT to generate the quadrature pulses from the terminal count data on PIT outl, and the quadrature clock data from PIT QCLK.
  • FIG 4E depicts high speed TTL counters which are concatenated with a counter internal to the CPU 30 to collect the "raw count". In general it is desirable to operate with as high a clock speed as possible to enhance position resolution.
  • the external counters collect the lowest order bytes of the 24 bit raw counter word.
  • FIG 4F shows the counter control
  • the linear comparator accepts the "echo” signal from the sensor module 20 while the pulse forming one shot generates an XDUCER signal corresponding to the "interrogation" signal.
  • FIG 4G depicts the resolution selection switch band which is debounced and latched by HCT245.
  • FIG 4H depicts the switch bank for selection of zero position index set point and quadrature phase and gradient measurement protocol. These settings are debounced and decoded by the PAL, they are communicated to the CPU 30 through the data bus.
  • the number and frequency of the quadrature pulses delivered to the user system also varies with magnet position and velocity.
  • FIG. 5A is a flow chart showing the
  • initialization routine executed by the microprocessor upon power up.
  • the routine initializes the variables in the source code, performs a self-diagnostic test, and then checks the state of various DIP switches.
  • the microprocessor enters the main portion of the source code, as shown in FIG. 5B. While executing the main portion of the program, the microprocessor performs three discrete processes: (1) interrogation of the transducer and recirculation control; (2) mathematical conversion of the raw data corresponding to the linear displacement information into quadrature pulse count and velocity data; and (3) generation of the quadrature pulses.
  • PROCESS NO. 1 INTERROGATION AND RECIRCULATION
  • FIGS. 5C and 5D are flow charts showing the method by which the microprocessor performs the
  • the microprocessor first initializes all variables, clears counters, and then loads the
  • the microprocessor initiates an "interrogate" signal which causes an excitation pulse on the
  • the corresponding echo or return signal is transmitted as an interrupt signal to the recirculation counter in the microprocessor.
  • This interrupt signal causes the recirculation counter to be decremented by one.
  • the interrogation process is continuously repeated, and, each time the microprocessor receives an interrupt due to the return signal, the recirculation counter is decremented by one. When the recirculation count reaches a value of one, a hardware bit is set which will freeze the counters and all interrogation hardware upon receipt of the last return or echo signal. The last return signal interrupts the CPU of the
  • the microprocessor After the microprocessor receives the last return signal, the raw count information, which is proportional to the physical location of the position magnet, is transferred from the external counters to the system RAM. The microprocessor may then start the process again for another interrogation and
  • PROCESS NO. 2 MATHEMATICAL CONVERSION
  • FIG. 5D is a flow chart which shows the microprocessor routine for converting the raw count data into quadrature pulse count and velocity data.
  • the mathematical conversion routine also calculates the velocity of the quadrature pulses, which is directly proportional to the velocity of the position magnet.
  • a counter which acts as a timer, runs
  • the microprocessor reads the timer at the start and end of each interrogation and recirculation cycle to compute the total time elapsed.
  • the microprocessor also records the starting and ending physical positions of the magnet as
  • FIG. 5E is a flow chart which shows the
  • microprocessor routine for generating quadrature pulses.
  • quadrature pulse count data is available from the conversion routine, the data from the mathematical conversion is loaded into a programmable interval timer.
  • the interval timer generates the actual quadrature pulses from the quadrature pulse count data, the number of pulses generated being equal to the quadrature pulse count.
  • the interval timer also performs the division required to calculate the velocity component of the quadrature pulses.
  • the interval timer interrupts the microprocessor to receive another set of data values from the mathematical
  • FIG. 5G is a flow chart which shows the microprocessor routine for establishing a zero point (index mark).
  • the EOM has the unique capability of establishing a zero point, as programmed by the user, at any position on the wave guide. As the position magnet crosses the zero point, an index marker pulse is
  • the user moves the magnet to the desired position of the zero point on the wave guide.
  • the user toggles a switch on the EOM, which causes an interrogation of the wave guide.
  • the raw data of the return signal which corresponds to the zero point, is stored in RAM and EEPROM so that the value of the zero point is saved even if the power is cycled.
  • FIG. 5H is a flow chart showing the method by which the microprocessor establishes a gradient of the wave guide. Alternatively, if this process is not used, the microprocessor will use a default gradient which is stored in memory and is an approximated average of all transducer waveguides.
  • the user positions the magnet at any point along the wave guide and presses a button on the module, which causes the microprocessor to interrogate the wave guide and store the corresponding return signal.
  • the user moves the magnet (for example) exactly ten inches and depresses the same button.
  • the EOM again interrogates the wave guide and stores the return signal.
  • the microprocessor can determine the elapsed time between the -two positions. Therefore, by knowing that the distance between those values is ten inches, the microprocessor calculates the velocity of the propagation of a sonic wave for this wave guide and stores this velocity (gradient) in non-volatile memory for use in future calculations.
  • FIG. 51 is a flow chart showing the burst mode of operation.
  • the burst mode enables the user to obtain current displacement information either synchronously or asynchronously.
  • the controller can activate a burst mode input signal on the EOM, and this will subsequently cause an interrogation of the wave guide.
  • the EOM will respond with a fixed frequency pulse train of quadrature pulses that will provide the current magnet position with respect to the user-set zero point.
  • the wave guide In the synchronous mode, the wave guide is continuously interrogated and the output conversion module constantly generates corresponding pulses
  • Quadrature Encoder Board * Quadrature Encoder Board * ; * Project * ; * Date of Creation : Septeacer 20, 1990 * ; * Created By : Steve Yaucn * ; * Derived From : QUAD.ASM * ; * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  • CALC_BUFF_AVAIL DBIT 1 ; Calculation buffer available
  • P8254_AVAIL DBIT 1 ; 8254 available flag
  • TMR_DONE DBIT 1 ; Timer done flag
  • CALC_LOW DS 1 ; Storage for low byte of raw data
  • CALC_MED DS 1 ; Storage for medium byte of raw dt CALC_HIGH: DS 1 ; Storage for high byte of raw data OLD_LOW: DS 1 ; Storage for low byte of old react OLD_MED: DS 1 ; Storage for medium byte of old react OLD_HIGH: DS 1 ; Storage for high byte of old react
  • NEW_MED DS 1 ; Storage for aediua byte of new react
  • NEW_HIGH DS 1 ; Storage for hign byte of new react SCALE: DS 3 ; Storage for scaling value
  • Velocity value storage DS 1 ; Velocity time used to calc velVELNEW_T: DS 1 ; Velocity time sed to calc velVELOCITY: DS 2 ; Velocity value storage
  • QUAD_COUNT DS 4 ; Quad count value for change inVEL_TIMER: DS 1 ; veloctiy timer
  • T10MSEC EQU 30 Tiaer for 10 msec
  • CALL INIT_RECIRCS Start up the recirc process ;
  • CALL CALC_ETJNITS calculate engineering units;
  • CALL FLAG_SETUP Go initialize flags
  • Main loop that reads xducer, calculates number of quad pulses, transmits; pulses, and checks for zero pulse
  • JNB SAMPLE_AVAIL, CHK3 Is raw sample available ? JNB CALC_BUFF_AVAIL, CHK3 ; If so, is calculation buff availab
  • MovE_RAW Mov DPTR.#CTR_LOW ; Point to counter low byte
  • Mov DPTS,#CTR_HIGH Point to counter medium byte MovX A, @DPTR ; Get medium count
  • TIMR0_SERVICE RETI
  • Tmr_Done set if recirc timeout complete
  • TIMR1_SERVICE ;
  • Interrupt 0 service routine Interrupt generated when *; * 3254 has completed pulse generation. If a new set of *; * values are available, tney are loaded and the S254 is *; * started.
  • Mov A,#255 Set position change to zero MovX @DPTR,A ; Load low byte of pos. change MovX @DPTR,A ; Load medium 1 byte of pos. change Mov DPTR,#PIT_CTRL_ADDR ; Point to control register
  • Mov A,#255 Set position change to zero MovX SDPTR,A ; Load medium 2 byte of pos. change MovX @DPTR,A ; Load hign byte of pos. change
  • Movx @DPTR,A Load low byte of pos. count Mov A, QUAD_COUNT+1 Load med 1 byte of pos. count Movx @DPTR,A
  • Mov DPTR,#PIT_CTR3_ADDR Point to counter 3 Mov A,QUAD_COCNT+2 ; Set portion change to zero
  • CALC_EUNITS ;
  • Mov DPTR,#CTR_HIGH Point to counter aediua byte MovX A,@DPTR ; Get medium count
  • EXTRN BIT (CHIP_ SEL,DATA CLK,DATA_IN,DATA_OUT,WDI)
  • EXTRN BIT (READ'ERR,PROM_ERR)
  • ACALL SEND_DATA_BYTE send one byte of data to EEPROM Mov A,EPRDATAL ;move lower byte of data to ACC
  • SETF OUT1 SETF CLK56MHZ
  • RTN_LAT SETF /CLK56MHZ

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

Instrument magnétostrictif de mesure d'une position permettant de générer des impulsions de sortie dans des ondes carrées en quadrature indiquant la position d'un aimant le long d'un guide d'ondes.
PCT/US1992/001956 1991-03-11 1992-03-10 Transducteur magnetostrictif de position a sortie de codage emule WO1992015844A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66756591A 1991-03-11 1991-03-11
US667,565 1991-03-11

Publications (1)

Publication Number Publication Date
WO1992015844A1 true WO1992015844A1 (fr) 1992-09-17

Family

ID=24678736

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/001956 WO1992015844A1 (fr) 1991-03-11 1992-03-10 Transducteur magnetostrictif de position a sortie de codage emule

Country Status (1)

Country Link
WO (1) WO1992015844A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999002944A1 (fr) * 1997-07-08 1999-01-21 Asm Automation Sensorik Messtechnik Gmbh Procede et dispositif pour transmettre des signaux utiles de detecteurs de position magnetostrictifs
US6680603B1 (en) 1997-04-10 2004-01-20 Asm Automation Sensorik Messtechnik Gmbh High-efficiency method and pulse generator for generating short voltage pulses

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542062A (en) * 1978-09-20 1980-03-25 Canon Inc Speed detection system
EP0176620A2 (fr) * 1983-10-05 1986-04-09 Hitachi, Ltd. Dispositif et procédé pour la détection d'objets mobiles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542062A (en) * 1978-09-20 1980-03-25 Canon Inc Speed detection system
EP0176620A2 (fr) * 1983-10-05 1986-04-09 Hitachi, Ltd. Dispositif et procédé pour la détection d'objets mobiles

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELECTRONIQUE INDUSTRIELLE no. 9, 1 February 1981, PARIS,FRANCE pages 66 - 67; LOUIS PIERRE: 'Le capteur magnéto-sonique mesure les déplacements, positions, vitesses.' *
PATENT ABSTRACTS OF JAPAN vol. 004, no. 078 (P-014)6 June 1980 & JP,A,55 042 062 ( CANON INC ) 25 March 1980 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6680603B1 (en) 1997-04-10 2004-01-20 Asm Automation Sensorik Messtechnik Gmbh High-efficiency method and pulse generator for generating short voltage pulses
WO1999002944A1 (fr) * 1997-07-08 1999-01-21 Asm Automation Sensorik Messtechnik Gmbh Procede et dispositif pour transmettre des signaux utiles de detecteurs de position magnetostrictifs
US6469498B1 (en) 1997-07-08 2002-10-22 Asm Automation Sensorik Messtechnik Gmbh Method and arrangement for the transmission of useful signals in magnetostrictive position sensors

Similar Documents

Publication Publication Date Title
US5206586A (en) Magnetostrictive position transducer having square-wave-in-quadrature-output
EP0200896B1 (fr) Circuit digital pour un débitmètre et procédé pour la mesure du débit
US4672555A (en) Digital ac monitor
US5311124A (en) Emulated analog output magnetostrictive position transducer with set point selection
WO1992015844A1 (fr) Transducteur magnetostrictif de position a sortie de codage emule
US4251869A (en) Frequency-to-binary converter
EP0024969A1 (fr) Machine de mesure et procédé pour engendrer des signaux d'indication de déplacement dans une telle machine
JP2024125735A (ja) 計測装置及び計測方法
KR0160356B1 (ko) 범용측정기와 처리 시스템간 인터페이스 장치
SU1247669A1 (ru) Устройство индикации веса
SU1630712A1 (ru) Устройство дл измерени частоты и соотношени тактов доильного аппарата
SU1120385A1 (ru) Многоканальный преобразователь угол-фаза-код
KR100220505B1 (ko) 대형축의 연결상태 직선도 측정용 인터페이스 장치
SU1008621A1 (ru) Уровнемер
RU1831655C (ru) Ультразвуковой расходомер
SU1432771A1 (ru) Устройство дл автоматического измерени погрешности преобразовател угла
SU1281886A1 (ru) Гидростатическа система нивелировани
SU1211676A1 (ru) Устройство контрол характеристик электрических сигналов
SU859944A1 (ru) Многоканальный преобразователь частоты в код
RU2018173C1 (ru) Измеритель частоты
SU1081437A2 (ru) Устройство дл измерени температуры
SU712953A1 (ru) Многоканальный преобразователь частоты в код
SU1705757A1 (ru) Устройство дл измерени параметров частотных датчиков
SU1499389A1 (ru) Передающее устройство адаптивной телеизмерительной системы
SU568959A1 (ru) Устройство дл измерени перемещени

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA JP KR

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LU MC NL SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA