EP0272750A2 - Dispositif de transmission de valeurs de mesure d'un capteur - Google Patents

Dispositif de transmission de valeurs de mesure d'un capteur Download PDF

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Publication number
EP0272750A2
EP0272750A2 EP87202516A EP87202516A EP0272750A2 EP 0272750 A2 EP0272750 A2 EP 0272750A2 EP 87202516 A EP87202516 A EP 87202516A EP 87202516 A EP87202516 A EP 87202516A EP 0272750 A2 EP0272750 A2 EP 0272750A2
Authority
EP
European Patent Office
Prior art keywords
circuit
sensor
pulses
pulse
measurement
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP87202516A
Other languages
German (de)
English (en)
Other versions
EP0272750A3 (fr
Inventor
Jürgen Kordts
Gerhard Dr. Martens
Joachim W. P. Gensel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Corporate Intellectual Property GmbH
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Corporate Intellectual Property GmbH, Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Publication of EP0272750A2 publication Critical patent/EP0272750A2/fr
Publication of EP0272750A3 publication Critical patent/EP0272750A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/22—Electric signal transmission systems in which transmission is by pulses by varying the duration of individual pulses
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/26—Electric signal transmission systems in which transmission is by pulses by varying pulse repetition frequency
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
    • G08C23/06—Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres

Definitions

  • the invention relates to an arrangement for transmitting measured values of at least one sensor, preferably via an optical waveguide with a transmitter circuit and a receiver circuit, which contains an evaluation unit.
  • Such an arrangement transmits signals generated by a sensor from a transmitter circuit via a transmission link to a receiver circuit.
  • a transmission link can be a coaxial cable.
  • the transmission path preferably consists of an optical waveguide.
  • the electrical signals generated by the sensor are converted by a light transmitter into optical signals, which are coupled into the optical waveguide.
  • the receiver circuit contains a light receiver which resets the optical signals into electrical signals which are fed to an evaluation unit. Due to the transmission via fiber optic cables, the transmitted signal cannot be influenced by electromagnetic interference fields.
  • the transmitter circuit emits an optical pulse, the start of which depends on the measurement result. It is also possible to generate a pulse in which the measurement result depends on its width. Since the transmitter circuits work completely potential-free, no sensor interference radiation, for example via an electrical power supply, is possible. The absence of potential also enables the sensors to be used in potentially explosive areas.
  • the sensors are each integrated in an integrator circuit (RC element), the sensor being either a variable resistance element or a variable capacitive element. This construction means that no four-pole sensor, for example a strain gauge bridge, can be used.
  • the transmitter circuit mentioned has a complicated structure, because an address evaluation takes place before the start of each measurement. In addition, continuous and rapid transmission of measured values is not possible, since the capacitor serving to supply energy in the transmitter circuit is first charged, then an address is evaluated and the measurement result is then output after integration.
  • the invention is therefore based on the object of providing an arrangement for transmitting measured values of at least one sensor, in which the transmission of measured values is carried out quickly and independently of the receiver circuit.
  • the senor can be controlled by the control pulses generated by a pulse generator circuit, in that the sensor emits a measurement pulse dependent on the measured values to the pulse generator circuit during the occurrence of a control pulse, and in that the repetition frequency and / or width of the control pulses is dependent on the amplitude value of the measurement pulses.
  • the sensor is only activated when a control pulse occurs.
  • the sensor emits a measurement pulse that depends on the measurement result.
  • the amplitude value of the measuring pulse corresponds to the measured value.
  • the measurement pulses are converted into control pulses with a constant amplitude value.
  • the repetition frequency or the width or the repetition frequency and the width of the control pulses can depend on the measured values.
  • a constant duty cycle this is the ratio of pulse width to period
  • the width and the repetition frequency of the control pulses vary.
  • a variable duty cycle either the repetition frequency or the width of the control pulses depends on the measured values.
  • the pulse generator circuit must be designed so that it always generates control pulses in the measuring range of the sensor. Even after the arrangement has been switched on, it must generate control pulses with a certain width, which occur with a certain repetition frequency.
  • the energy required for the transmitter circuit is supplied by a battery, it is desirable to ensure a long service life for the battery. This can be realized by the transmitter circuit with energy-saving components, e.g. CMOS elements.
  • the main energy consumer is the sensor.
  • the energy consumption of the sensor is also kept low by the pulse-like control.
  • Another advantage of the arrangement according to the invention is that four-pole sensors, e.g. a strain gauge bridge, can be used.
  • the two-pole input of the sensor is controlled by the control signal and the two-pole output of the sensor supplies the measuring pulse.
  • the pulse generator circuit includes a detection circuit which determines the amplitude value of the measuring pulses by forming the difference between the value when a measuring pulse occurs and the value during the subsequent pulse pause, and a subsequent converter circuit which contains the data from the respective determined amplitude value-dependent control signals generated.
  • the detection circuit may be designed to include a DC decoupling circuit and a sample and hold circuit that stores the output signal of the DC decoupling circuit during the occurrence of the measurement pulses.
  • the measuring pulses supplied by the sensor contain a DC signal and an AC signal component. Since the measurement result is dependent on the amplitude value of a measurement pulse, decoupling from the DC signal is achieved in the DC signal decoupling circuit. The amplitude value of the measuring pulse can be related to a given size.
  • the output signal of the DC decoupling circuit is stored in the subsequent sample and hold circuit.
  • the sample-and-hold circuit can also be used to average the measured values if the storage is carried out by means of an integrator circuit.
  • the converter circuit can be designed in such a way that a comparator generating the control pulses is present, which has a signal supplied by a changeover switch that corresponds to the determined amplitude value during the occurrence of the measurement pulses and a reference value during the measurement pulse pause, with an integration signal integrating the control pulses Comparing the integration circuit which integrates an essentially constant first reference value during the control pulse pauses and disintegrates an essentially constant second reference value during the control pulses. During the control pulse pause, the integration circuit carries out an integration of the comparator output signal until a reference value is reached. The comparator then generates a control pulse, which is integrated by the integration circuit.
  • the integrator circuit can be constructed in such a way that a smaller time constant is present during the control pulse pause than during the control pulse.
  • the converter circuit can also be constructed, for example, with a relaxation oscillator.
  • the pulse generator circuit is coupled to a sensor activation circuit which, from the control pulses, suitable activation pulses for the activation of the Sensor generated.
  • the sensor activation circuit converts, for example, voltage pulses into current pulses, for example for a strain gauge bridge, or generates activation pulses with a certain width.
  • a differentiator that differentiates the control pulses is connected to the pulse generator circuit.
  • the differentiated control pulses can be supplied to a light transmitter, for example, which is coupled to an optical waveguide.
  • the transmitter circuit contains a pulse generator circuit 3, in which the measuring pulses supplied by the sensor 1 are fed via an amplifier 4 and a downstream detection circuit 5 to a converter circuit 6.
  • the measurement pulses amplified in the amplifier 4 are separated from the DC signal component in a DC signal decoupling circuit 7 present in the detection circuit 5 and are related to another predetermined DC signal value.
  • the signal supplied by the detection circuit 5 or by the sample and hold element 8 is converted into control pulses in the converter circuit 6.
  • the repetition frequency or the width or the repetition frequency and the width of the control pulses is dependent on the output signal of the detection circuit 5.
  • the repetition frequency and / or the width of the control pulses is therefore a measure of the amplitude value of the measurement pulses.
  • the control pulses are supplied on the one hand to a sensor activation circuit 10 and on the other hand to a differentiating element 11.
  • the sensor activation circuit 10 forms suitable activation pulses for driving the sensor 1, for example the sensor activation circuit converts voltage pulses into current pulses or changes the width of the voltage pulses.
  • the control pulses are differentiated in the differentiating element 11 and sent to a light transmitter 12.
  • the light transmitter 12 converts the differentiated electrical Control pulses into optical signals, which are coupled into the optical waveguide 2.
  • the optical waveguide 2 transmits these optical signals to a light receiver 13 which is part of the receiver circuit and which resets the optical signals into electrical signals and feeds them as evaluation pulses to an evaluation unit 14 for further processing.
  • Control pulses which are referred to as signal A, occur as the output signal of the pulse generator circuit 3 or the converter circuit 6.
  • This signal A is converted in the sensor activation circuit 10 into activation pulses, which are designated as signal B.
  • the sensor 1 emits measurement pulses which are amplified in the amplifier 4 and whose output signal is designated as signal C in FIG. 2.
  • the sensor 1 therefore only emits a measuring pulse when there is an activation pulse.
  • the information about the measurement result or the measurement value of the measurement pulse is given by the amplitude value of the measurement pulse.
  • the offset present in signal C must be removed and the amplified measuring pulses related to a predetermined constant, which in this exemplary embodiment is zero.
  • the decoupled signal C at the output of the DC decoupling circuit 7 is the signal D which is fed to the sample and hold element 8 and which holds the value which was determined during the occurrence of a measuring pulse until the next measuring pulse.
  • the sample and hold element 8 supplies a signal E which is converted into control pulses or the signal A in the converter circuit 6.
  • the sensor 1 in this exemplary embodiment consists of a strain gauge bridge with four resistors 20, 21, 22 and 23. In each case one connection of the resistors 20 and 21 is connected to the sensor activation circuit 10.
  • the sensor activation circuit 10 contains an operational amplifier 25, to the non-inverting input of which a resistor 26 is connected, the other connection of which is connected to the pulse generator circuit 3.
  • a resistor 27 is connected between the non-inverting input and the common connection point of the resistors 20 and 21.
  • a resistor 28 is connected between the output of the operational amplifier 25 and the common connection of the two resistors 20 and 21.
  • the sensor activation circuit 10 generates current pulses I1 from the control pulses, which are supplied as activation pulses to the strain gauge bridge.
  • the signal I1 is shown schematically in FIG. 4.
  • the common connection point of resistors 22 and 23 of the strain gauge bridge is connected to ground.
  • a first output connection 32 forms the common connection of resistors 21 and 23 and a second output connection 33 of the strain gauge bridge forms the common connection of resistors 20 and 22.
  • connection 32 is connected via a resistor 34 to the inverting input of an operational amplifier 35 and the connection 33 via a resistor 36 to the non-inverting input of the operational amplifier 35.
  • the non-inverting input is further connected via a resistor 37 to a reference voltage source which has a direct voltage Uref delivers.
  • a resistor 38 is also connected between the inverting input and the output of the operational amplifier 35.
  • U1 At the output of the operational amplifier 35 there is a signal U1 (see FIG. 4) which represents the amplified measuring pulses.
  • the amplitude value Um of a measurement pulse corresponding to the measurement result is the difference between the value when a measurement pulse occurs and the value during the subsequent pulse pause.
  • the elements 34 to 38 form an amplifier 4, which amplifies the measuring pulses of the strain gauge bridge to such an extent that they can be easily processed in the subsequent stages.
  • the signal U1 is decoupled in the subsequent capacitor 40 (DC signal decoupling circuit) and related to a predetermined DC voltage variable Uref.
  • a capacitor 41 is connected downstream of the capacitor 40, which connects the capacitor 40 to a DC voltage source Uref during the measurement pulse pause and to a resistor 42 connected during the occurrence of the measurement pulses.
  • the changeover switch is controlled by the control pulses because the control pulses and the measurement pulses occur practically at the same time. Since the capacitor 40 is connected to the DC voltage source Uref during the measurement pulse pause, the measurement pulses are superimposed with this DC voltage value (see FIG. 4, signal U2).
  • the resistor 42 is still connected to a capacitor 43 connected to ground.
  • Elements 41, 42 and 43 form a sample and hold circuit, i.e. the value stored in the capacitor 43 during a measuring pulse is stored during the measuring pulse pause (see FIG. 4, U3).
  • averaging over a plurality of measuring pulses is carried out with the resistor 42 and the capacitor 43, which represent an integration circuit. This largely suppresses disturbances and fluctuations in the measured value.
  • the time constant of the integrator circuit depends on the choice of the resistance value of the resistor 42 and the capacitance of the capacitor 43.
  • the elements 40 to 43 described so far represent the detection circuit 5.
  • the converter circuit 6 connected downstream of the detection circuit 5 contains a changeover switch 45.
  • the changeover switch 45 is connected to the center tap of a potentiometer 46, one external connection of which is connected to ground and the other external connection is connected to a direct voltage source which supplies a direct voltage of 2 Uref.
  • the switch 45 connects the inverting input of a comparator 47 either to the output of the detection circuit 5, i. H. with the common connection of the resistor 42 and the capacitor 43 or with the center tap of the potentiometer 46.
  • the changeover switch 45 is controlled by means of the control pulses.
  • the output value Ua of the detection circuit 5 is thus present at the inverting input of the comparator 47 during the measurement pulse and a value Ue supplied by the potentiometer 46 is present during the measurement pulse pause (see FIG. 4, signal U4).
  • the output of an operational amplifier 48 and a capacitor 49 are connected to the non-inverting input of the comparator 47.
  • the non-inverting input of the Operational amplifier 48 is connected to a DC voltage source which supplies the DC voltage Uref.
  • the inverting input is connected on the one hand to the capacitor 49 connected to the output of the operational amplifier 48 and on the other hand to the common connection of two resistors 50 and 51.
  • the resistors 50 and 51 are connected to two different output connections of a changeover switch 52.
  • the input terminal of the switch 52 is connected to the output of the comparator 47.
  • the switch 52 connects on the one hand the resistor 51 and on the other hand the resistor 50 to the output of the comparator 47.
  • the switch 52 is controlled by means of the control pulses.
  • the two changeover switches 45 and 52 are in the position shown in FIG. 3, ie the potentiometer 46 is connected to the inverting input of the comparator 47 and the output of the comparator 47 to the resistor 51.
  • the potentiometer 46 must be set so that the voltage it supplies is greater than Uref and less than 2 Uref.
  • the voltage present at the output of the comparator 47 during the measurement pulse pause is integrated by the integrator circuit formed from the elements 48 to 52 until the voltage value Ue supplied by the potentiometer 46 is reached. When this voltage value is reached, the comparator 47 generates a control pulse, as a result of which the changeover switches 45 and 52 are switched over.
  • the integrator circuit then integrates the voltage values of the output signal of the comparator 47 until the value Ua supplied by the detection circuit 5 is reached.
  • the comparator then ends the control pulse generation.
  • the signal U4 present at the output of the changeover switch 45, the signal U5 present at the non-inverting input of the comparator 47 and the output signal of the comparator U6, that contains the control pulses is shown in FIG. 4.
  • the duty cycle is always the same. (The duty cycle is the ratio of the pulse width to the period).
  • the dependence on the amplitude values of the measurement signals is determined by the width T2 and the period T1 of the signal U6 (see FIG. 4).
  • the pulse duty factor is set via the resistance values of resistors 50 and 51.
  • the repetition frequency and the width of the control pulses can be influenced by adjusting the potentiometer 46.
  • the period T1 or the width T2 of the control pulses is proportional to the output signal of the detection stage 5.
  • the voltage supplied by the potentiometer 46 must be greater than Uref so that control pulses are generated when switching on and at the minimum measured value.
  • the signals U6 are also fed to the differentiator 11, which contains a capacitor 55 connected to the output of the comparator 47, the other connection of which is connected on the one hand to a resistor 56 connected to ground and on the other hand to a diode 57 connected to ground.
  • the anode of diode 57 is grounded.
  • the common connection point of the capacitor 55, the resistor 56 and the diode 57 is connected to a control input of a switch 58. If there is a differentiated control pulse, switch 58 is closed.
  • the switch 58 is connected to ground on the one hand and connected to the cathode of a light-emitting diode 59 on the other hand.
  • the anode of the diode 59 is connected to a capacitor 60 connected to ground and to a resistor 61.
  • the other connection point of the resistor 61 is connected to a DC voltage source, which supplies the voltage 2 Uref.
  • the transmitter circuit shown in FIG. 3 is supplied with energy from a battery, for example a lithium battery, so that there is freedom from potential.
  • a battery for example a lithium battery
  • energy-saving elements in particular CMOS circuit elements, should be used.
  • the main energy consumer is the sensor.
  • the pulse control keeps the energy consumption very low.
  • the strain gauge bridge shown in Fig. 3 is an example of a sensor to be used.
  • 5 shows a resistance sensor which can be used, for example, for temperature measurement and which changes its resistance with temperature.
  • the resistance sensor 65 is connected on the one hand to ground and on the other hand to the sensor activation circuit 10 and the amplifier 4.
  • the sensor activation circuit 10 supplies the resistance sensor 65 with current pulses.
  • a non-linearity of the resistance sensor 65 can be compensated for by a suitably opposite gain characteristic.
  • the capacitive sensor 66 shows a capacitive sensor which can be used, for example, for moisture measurement and which changes its capacitance with the moisture.
  • the capacitive sensor 66 is connected to a capacitor 67 and to the amplifier 4.
  • the other connection of the capacitor 67 is supplied with voltage pulses from the sensor activation circuit 10.
  • the capacitive sensor 66 and the capacitor 67 form a voltage divider, so that the voltage signal at the sensor depends on the output signal of this voltage divider.
  • FIG. 7 shows a sensor in which three capacitors are connected in series, the two outer capacitors representing the measuring capacitors and can, for example, be elements of a differential pressure sensor.
  • a first capacitive sensor 68 is connected, on the one hand, to ground and, on the other hand, to a reference capacitor 69 and a connection of the amplifier 4 designed as a summation amplifier.
  • the other connection point of the capacitor 69 is connected to a further input of the amplifier 4 and to a connection of a second capacitive sensor 71.
  • the other connection of the capacitive sensor 71 is connected to the sensor activation circuit 10 and to a further input of the amplifier 4.
  • the construction of the transmitter circuit shown above generates optical signals that are independent of the sensor type, ie. H. are standardized.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measuring Fluid Pressure (AREA)
EP87202516A 1986-12-20 1987-12-15 Dispositif de transmission de valeurs de mesure d'un capteur Withdrawn EP0272750A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863643715 DE3643715A1 (de) 1986-12-20 1986-12-20 Anordnung zur uebertragung von messwerten eines sensors
DE3643715 1986-12-20

Publications (2)

Publication Number Publication Date
EP0272750A2 true EP0272750A2 (fr) 1988-06-29
EP0272750A3 EP0272750A3 (fr) 1989-09-06

Family

ID=6316742

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87202516A Withdrawn EP0272750A3 (fr) 1986-12-20 1987-12-15 Dispositif de transmission de valeurs de mesure d'un capteur

Country Status (4)

Country Link
US (1) US4866436A (fr)
EP (1) EP0272750A3 (fr)
JP (1) JPS63166000A (fr)
DE (1) DE3643715A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0323871A2 (fr) * 1988-01-08 1989-07-12 ENVEC Mess- und Regeltechnik GmbH + Co. Convertisseur tension-fréquence et son application dans un système de transmission à guides d'ondes lumineuses
EP0509920A1 (fr) * 1991-04-16 1992-10-21 Gec Alsthom Sa Dispositif de signalisation de la position d'un organe mobile
GB2273840A (en) * 1992-12-09 1994-06-29 Sony Corp Optically transmitting signals between measurement devices

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
US4996655A (en) * 1989-02-16 1991-02-26 Micron Technology, Inc. Real time monitoring of remote signals in an industrial environment
DE3913901A1 (de) * 1989-04-27 1990-10-31 Kloeckner Humboldt Deutz Ag Uebertragung von messwerten
US5469442A (en) * 1992-08-24 1995-11-21 The United States Of America As Represented By The United States Department Of Energy Compact self-contained electrical-to-optical converter/transmitter
KR100384058B1 (ko) * 2000-10-27 2003-05-16 삼성전자주식회사 반도체 이온주입장치의 텐더트론 가속기내 터보펌프 구동상태 감지장치 및 감지방법
DE10213845B4 (de) * 2002-03-27 2005-10-20 Siemens Ag Anordnung zur elektrischen Energieversorgung eines Verbrauchers mittels einer zweigeteilten Übertragungsstrecke
KR100755681B1 (ko) * 2006-06-30 2007-09-05 삼성전자주식회사 아날로그 신호를 디지털 신호로 변환하기 위한 장치 및방법
DE102017102417A1 (de) * 2017-02-08 2018-08-09 Infineon Technologies Ag Sensorbauelemente und verfahren zum übertragen von sensordaten und verfahren zum steuern eines sensorbauelements, vorrichtung und verfahren zum decodieren eines sensorsignals

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DE2232450A1 (de) * 1971-08-03 1973-03-01 Gossen Gmbh Schaltungsanordnung zur uebertragung und anzeige von in elektrischer form vorliegenden physikalischen groessen oder signalen
DE3215131A1 (de) * 1982-04-23 1983-10-27 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zur umsetzung einer nicht elektrischen groesse in ein elektrisches signal

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US3717858A (en) * 1970-08-12 1973-02-20 D Hadden Two conductor telemetering system
US4296413A (en) * 1979-09-28 1981-10-20 General Electric Company Resistance-bridge to frequency converter with automatic offset correction
US4680585A (en) * 1985-02-22 1987-07-14 The United States Of America As Represented By The United States Department Of Energy Pulse-excited, auto-zeroing multiple channel data transmission system

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DE2232450A1 (de) * 1971-08-03 1973-03-01 Gossen Gmbh Schaltungsanordnung zur uebertragung und anzeige von in elektrischer form vorliegenden physikalischen groessen oder signalen
DE3215131A1 (de) * 1982-04-23 1983-10-27 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zur umsetzung einer nicht elektrischen groesse in ein elektrisches signal

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Title
INSTRUM. & EXPER. TECHN., Band 21, Nr. 3/1, Mai/Juni 1978, Seiten 675-677, Plenum Publishing Corp.; L.W. SUNG et al.: "Converter of resistance pulse-repetition period" *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0323871A2 (fr) * 1988-01-08 1989-07-12 ENVEC Mess- und Regeltechnik GmbH + Co. Convertisseur tension-fréquence et son application dans un système de transmission à guides d'ondes lumineuses
EP0323871A3 (fr) * 1988-01-08 1990-08-22 ENVEC Mess- und Regeltechnik GmbH + Co. Convertisseur tension-fréquence et son application dans un système de transmission à guides d'ondes lumineuses
EP0509920A1 (fr) * 1991-04-16 1992-10-21 Gec Alsthom Sa Dispositif de signalisation de la position d'un organe mobile
FR2675609A1 (fr) * 1991-04-16 1992-10-23 Alsthom Gec Dispositif de signalisation de la position d'un organe mobile.
GB2273840A (en) * 1992-12-09 1994-06-29 Sony Corp Optically transmitting signals between measurement devices
US6078877A (en) * 1992-12-09 2000-06-20 Sony Corporation Method for optically transmitting signals in measurement units and measurement system employing the optical transmission method

Also Published As

Publication number Publication date
DE3643715A1 (de) 1988-06-30
US4866436A (en) 1989-09-12
EP0272750A3 (fr) 1989-09-06
JPS63166000A (ja) 1988-07-09

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