EP0125433A1 - Mittel zur übertragung von Messdaten - Google Patents

Mittel zur übertragung von Messdaten Download PDF

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Publication number
EP0125433A1
EP0125433A1 EP84103064A EP84103064A EP0125433A1 EP 0125433 A1 EP0125433 A1 EP 0125433A1 EP 84103064 A EP84103064 A EP 84103064A EP 84103064 A EP84103064 A EP 84103064A EP 0125433 A1 EP0125433 A1 EP 0125433A1
Authority
EP
European Patent Office
Prior art keywords
pick
frequency
converter
circuit
voltage
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Withdrawn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
EP84103064A
Other languages
English (en)
French (fr)
Inventor
Hannu Hannukainen
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.)
Valmet Oy
Original Assignee
Valmet Oy
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 Valmet Oy filed Critical Valmet Oy
Publication of EP0125433A1 publication Critical patent/EP0125433A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/12—Electric signal transmission systems in which the signal transmitted is frequency or phase of ac

Definitions

  • the present invention concerns a means for transferring information from a pick-up, said means comprising an electrical measuring pick-up, such as a strain gauge assembly, a capacitor or equivalent, and electric power means by which power is supplied to the measuring circuit.
  • an electrical measuring pick-up such as a strain gauge assembly, a capacitor or equivalent
  • electric power means by which power is supplied to the measuring circuit.
  • One of the applications of the present invention is a wireless pick-up data transferring means, i.e., a telemetric means, by which it is possible to measure the temperatures, moments, pressures, stresses etc. present at various points for instance in a machine, such as a tractor.
  • a wireless pick-up data transferring means i.e., a telemetric means, by which it is possible to measure the temperatures, moments, pressures, stresses etc. present at various points for instance in a machine, such as a tractor.
  • the object of the present invention is to provide, for the applications discussed, a new means usable in pick-up data transfer.
  • a particular object of the invention is to provide a means of which the space requirements are small, so that the means is also usable in those applications where the use of means of prior art has been inconvenient or outright impossible owing to their size. It is a particular object of the invention to provide a means in which the signal/noise ratio can be made sufficiently high; where the number of components, as well as the power requirement, is small; and which has minimal temperature dependence.
  • the invention is mainly characterized in
  • a voltage/frequency converter e.g. one of type AD 537.
  • the other requisite blocks which in actual fact only comprise the bridge circuit with its voltage supply and the antenna coil with matching transistors.
  • the pick-up/transmitter means depicited in Fig. 1 comprises a voltage/frequency converter 10 (V/f), to the input terminal 2 of which has been connected the bridge circuit 11 containing the pick-up arrangement.
  • the stabilized voltage supply of the bridge circuit 11 is provided through an operation amplifier 12, which buffers the existing reference voltage U R derivable from the terminal 4 of the means 10.
  • the branch Rb,Rv of the bridge 11 contains the pick-up resistance Rv (18) or a pair of resistances, e.g. a strain gauge, a temperature-dependent resistor, or equivalent.
  • the error voltage U o reflecting the deviation of the bridge is amplified with a differential amplifier 13.
  • the amplifier 13 may also be omitted if the unbalancing of the bridge 11 is powerful, and in that case it becones possible to control the current take-up of the converter 10 directly.
  • the amplifiers 12,13 are for instance of type LM 258.
  • the power source e.g. a miniature storage battery 20 (9 volts) is connected over the switch K and the voltage regulator 12 to the terminal 8 of the converter 10.
  • the frequency output (8)-(9) (f out ) of the converter 10 has been connected over a matching transistor (e.g. 2 N 3704) to the coil 15 serving as transmitter antenna.
  • the transistor 14 has been connected to operate as an emitter follower.
  • the band of long-wave transmitting frequency f out of the circuit of Fig. 1 is for instance between 50 and 150 kHz.
  • the central frequency f o of the converter 10 is selected with the aid of a capacitor C connected across its terminals (6)-(7), and this capacitor must be of high enough quality.
  • the measuring system includes, in addition to the pick-up/transmitter means, a receiving antenna 22, a receiver- /modulator combination 23 and an indicator, printer or other recording means, such as a tape recorder.
  • the pick-up datum Rv is converted into a voltage signal, which is amplified and conducted to the voltage/frequency converter 10, which converts the voltage signal into a radio frequency signal. It is thus understood that frequency modulation is applied.
  • the central frequency f o may be calculated as follows, with the notations of Fig. 2:
  • the transistor 14 matches the frequency to be appropriate for the antenna 15.
  • the antenna 15 is, as a rule, a small coil.
  • Fig. 3 has been shown a mechanical embodiment example of the pick-up means of the invention.
  • the pick-up means has been disposed, for instance, around the power transmission shaft 25 of a tractor.
  • the pick-up means is required to consume little space, to draw little power and to present a good signal/noise ratio.
  • the strain gauge 18 mounted in connection of the shaft 25 in a manner known in the art, is measured for instance the torque transferred by the shaft 25, on the basis of the torsion of this shaft 25.
  • the pick-up/transmitter means 10-14 of the invention has been mounted on an electronic circuit board 16, and its components have been embedded in an insulating compound 17, e.g. in epoxy resin.
  • an insulating compound 17 e.g. in epoxy resin.
  • To the circuit board 16 is carried the lead from the pick-up 18 and the lead from the miniature storage battery 20.
  • the miniature storage battery 20 is placed, with reference to the electronic circuit board 16, on the opposite side of the shaft 25 in a holder 19, in conjunction with the latter being further provided a voltage regulator 12, from which a lead 21 departs to the circuit board 16.
  • the measuring means does not cause any harmful mechanical unbalancing of the shaft 25.
  • the simplest way to mount the parts 17, 19 and 20 shown in Fig. 3 in conjunction with the shaft 25 is to wind these parts with tape.
  • the means is meant to be a permanent pick-up/transmitter means in conjunction with the shaft 25, it is possible to dispose the means in a special housing, the parts of this housing being fixed e.g. by their marginal flanges to each other and around the shaft 25.
  • the switch K may be arranged to be remote-controlled or to operate e.g. by centrifugal force so that it will only be closed when the shaft is rotating, or when otherwise needed.
  • the antenna coil 15 is fixed in conjunction with the shaft 25 that is being studied.
  • the antenna coil 15 emits into its surroundings a long-wave electromagnetic radiation, the frequency f out of which is in the range from 50 to 150 kHz mentioned above.
  • the radiation is received with the antenna 22 and with receiver/demodulator means 23 placed in the vicinity, and it is detected and if required recorded with means 24, in which the acting signal is dependent in a known manner on the resistance of the pick-up resistor R v .
  • the means just described may be used e.g. for measuring the torque transmitted by the loaded shaft 25 of a tractor e.g. between the gearbox and the clutch, or its vibrations, either in product development work or as a pick-up means incorporated in the tractor and joined to the tractor's electronic control system, or to a load-indicating means in the tractor cab, for instance an indicating instrument or a lamp array.
EP84103064A 1983-03-21 1984-03-20 Mittel zur übertragung von Messdaten Withdrawn EP0125433A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI830928 1983-03-21
FI830928A FI830928L (fi) 1983-03-21 1983-03-21 Anordning vid oeverfoering av givarinformation.

Publications (1)

Publication Number Publication Date
EP0125433A1 true EP0125433A1 (de) 1984-11-21

Family

ID=8516923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103064A Withdrawn EP0125433A1 (de) 1983-03-21 1984-03-20 Mittel zur übertragung von Messdaten

Country Status (5)

Country Link
EP (1) EP0125433A1 (de)
BR (1) BR8401316A (de)
DK (1) DK160684A (de)
FI (1) FI830928L (de)
NO (1) NO841087L (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297842A (en) * 1995-01-18 1996-08-14 Douglas Robson Remote pressure & temperature transmitter system
RU2506645C1 (ru) * 2012-06-20 2014-02-10 Сергей Иванович Бойко Устройство для бесконтактной передачи сигналов по трубопроводному каналу

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1584976A (de) * 1967-12-21 1970-01-09
GB1585175A (en) * 1977-07-13 1981-02-25 Talbot Motor Measurement apparatus for use with a rotary member

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1584976A (de) * 1967-12-21 1970-01-09
GB1585175A (en) * 1977-07-13 1981-02-25 Talbot Motor Measurement apparatus for use with a rotary member

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELECTRONIQUE & APPLICATIONS INDUSTRIELLES, no. 245, 1st December 1977, pages 23-26, Paris, FR, D. THOUVAY: "Six applications pratiques de la conversion tension-fréquence" *
HOVERING CRAFT AND HYDROFOIL, vol. 14, no. 10, June 1974, pages 22,23, London, GB "Frequency modulated telemetry for instrumentation of rotating shafts" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297842A (en) * 1995-01-18 1996-08-14 Douglas Robson Remote pressure & temperature transmitter system
RU2506645C1 (ru) * 2012-06-20 2014-02-10 Сергей Иванович Бойко Устройство для бесконтактной передачи сигналов по трубопроводному каналу

Also Published As

Publication number Publication date
FI830928A0 (fi) 1983-03-21
NO841087L (no) 1984-09-24
DK160684A (da) 1984-09-22
FI830928L (fi) 1984-09-22
DK160684D0 (da) 1984-03-20
BR8401316A (pt) 1984-10-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840320

AK Designated contracting states

Designated state(s): DE FR GB SE

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19850326

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HANNUKAINEN, HANNU