EP0041856A1 - Fernmessapparat - Google Patents

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Publication number
EP0041856A1
EP0041856A1 EP81302527A EP81302527A EP0041856A1 EP 0041856 A1 EP0041856 A1 EP 0041856A1 EP 81302527 A EP81302527 A EP 81302527A EP 81302527 A EP81302527 A EP 81302527A EP 0041856 A1 EP0041856 A1 EP 0041856A1
Authority
EP
European Patent Office
Prior art keywords
voltage
strain
frequency
converter
shaft
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Withdrawn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
EP81302527A
Other languages
English (en)
French (fr)
Inventor
Robert John Wagner
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Publication of EP0041856A1 publication Critical patent/EP0041856A1/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Withdrawn legal-status Critical Current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
    • G08C17/06—Arrangements for transmitting signals characterised by the use of a wireless electrical link using capacity coupling

Definitions

  • This invention relates to telemetry apparatus comprising a strain gauge mounted on a first of two parts and providing an alternating signal to a detector circuit 4 nounted on the second part by way of a capacitive coupling between the two parts.
  • a conventional method to collect strain data from a vehicle drive shaft under operating conditions is to mount a bridge circuit, of which one element is the strain gauge, strategically on the shaft.
  • the problem then exists of transferring the data from the rotating shaft, i.e. the aforementioned first part, to the body of the vehicle, i.e. the second part.
  • One solution e.g. US-PS 3 824 845) is to use slip rings but slip rings are a source of trouble in that the electrical connection provided thereby tends to deteriorate.
  • the strain gauge circuit is energised by an alternating signal from an oscillator mounted on the second part and capacitatively coupled to the strain gauge circuit on the first part.
  • Such an arrangement requires two capacitive couplings, each involving two capacitors, to couple the energising alternating signal to the strain gauge circuit and to couple the output alternating signal to the detector circuit.
  • Four capacitors in all are thus required, each with one plate on the first part and one plate on the second shaft. This makes the apparatus complicated.
  • An arragement is also known CUS-PS 3 303 701) which requires only two coupling capacitors for the case of a temperature measurement, employing a resonant circuit on the first part.
  • the frequency of the resonant circuit varies in dependence upon a temperature sensitive element therein and the resonant circuit is coupled by the capacitors to an amplifier circuit on the second part to form an oscillator whose frequency indicates the temperature.
  • the relationship between frequency and temperature is nonlinear.
  • the object of this invention is to provided an apparatus according to the introductory part of claim 1 which only requires two coupling capacitors but which can provide a linear representation of the measured strain and this object is met by the characterising features according to which the strain gauge circuit includes a voltage to frequency converter providing the alternating signal in response to a voltage proportional to the strain.
  • a bridge network is secured on a part subjected to strain, such as a shaft.
  • the output from the bridge network which is proportional to element strain, is delivered to a voltage to frequency converter.
  • the output from the frequency converter is in the form of a square wave with a frequency proportional to the strain.
  • the output from the frequency converter is delivered to a first set of capacitance rings placed about the part for which strain readings are desired.
  • a second set of stationary capacitance rings placed around the first rings provide capacitive coupling utilizing air as the dielectric.
  • the received signal is in the form of a differentiated square wave and is delivered to a squaring amplifier and thereafter to a frequency to voltage converter, wherefrom the signal is delivered by a readout device.
  • a voltage source shown as a battery supplies a voltage to an adjustable voltage regulator 11 of conventional design which delivers a voltage to a bridge network 13.
  • the bridge network 13 is strategically located on the vehicle drive shaft (not shown) in a conventional manner and includes as one resistor thereof a strain gauge.
  • the bridge produces an output voltage drop across the bridge network 13 proportional to shaft strain.
  • the output from the bridge network 13 is delivered to a voltage to frequency converter 15, such as manufactured by Analog Devices, Model AD537.
  • the output from the voltage to frequency converter 15 is in the form of a square wave having frequency proportional to shaft strain (illustratively shown in Fig 2).
  • the output from the frequency converter 15 is delivered to a capacitive coupling system 17.
  • the capacitive coupling system 17 includes first and second capacitance rings 19 and 21.secured around the periphery of the shaft in a conventional manner. All of items 11, 13, 15, 19 and 21 are mounted on the shaft. Third and fourth capacitance rings 23 and 25 are fixed in close proximity to the associated rings 19 and 21 respectively.
  • the frequency modulated voltage across rings 19 and 21 as received from the voltage to frequency converter 15 is transmitted to rings 23 and 25 using air as a dielectric.
  • the signal output from rings 23 and 25 is in the general form of a differentiated square wave (Fig 3).
  • the signal from rings 23 and 25 can then be delivered to an input amplifier 27 to increase its level.
  • the signal can be processed.further by passing it to a squaring amplifier 29, frequency to voltage converter 31 and then to a recorder or direct readout device 33. All of items 23, 25, 27, 29, 31 and 33 are mounted on the vehicle body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Testing Of Balance (AREA)
EP81302527A 1980-06-10 1981-06-08 Fernmessapparat Withdrawn EP0041856A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15809280A 1980-06-10 1980-06-10
US158092 1980-06-10

Publications (1)

Publication Number Publication Date
EP0041856A1 true EP0041856A1 (de) 1981-12-16

Family

ID=22566647

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81302527A Withdrawn EP0041856A1 (de) 1980-06-10 1981-06-08 Fernmessapparat

Country Status (2)

Country Link
EP (1) EP0041856A1 (de)
ES (1) ES8301024A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298891A2 (de) * 1987-07-06 1989-01-11 United Technologies Corporation Steigungssteuerung mit Kondensatorkopplung
AT388061B (de) * 1987-03-02 1989-04-25 Siemens Ag Oesterreich Signaluebertragungssystem
GB2381075A (en) * 2001-09-12 2003-04-23 Halil Giray Hassan Non-contact data transmission in rotating machinery
DE102019007229A1 (de) * 2019-10-17 2021-04-22 Krebs & Aulich Gmbh Anordnung zur kontaktlosen Energie- und Signalübertragung an einer Rotorwelle einer Elektromaschine
DE102019007229B4 (de) 2019-10-17 2024-10-31 Krebs & Aulich Gmbh Anordnung zur kontaktlosen Energie- und Signalübertragung an einer Rotorwelle einer Elektromaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Instrument Practice, Vol. 23, No. 5, May 1969 London (GB) "Short-Range Telemetry" page 369 * the whole article * *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT388061B (de) * 1987-03-02 1989-04-25 Siemens Ag Oesterreich Signaluebertragungssystem
EP0298891A2 (de) * 1987-07-06 1989-01-11 United Technologies Corporation Steigungssteuerung mit Kondensatorkopplung
EP0298891A3 (en) * 1987-07-06 1990-09-12 United Technologies Corporation Pitch control capacitance coupling
GB2381075A (en) * 2001-09-12 2003-04-23 Halil Giray Hassan Non-contact data transmission in rotating machinery
GB2381075B (en) * 2001-09-12 2004-09-01 Halil Giray Hassan A contact-less data transmission system for rotating machinery
DE102019007229A1 (de) * 2019-10-17 2021-04-22 Krebs & Aulich Gmbh Anordnung zur kontaktlosen Energie- und Signalübertragung an einer Rotorwelle einer Elektromaschine
DE102019007229B4 (de) 2019-10-17 2024-10-31 Krebs & Aulich Gmbh Anordnung zur kontaktlosen Energie- und Signalübertragung an einer Rotorwelle einer Elektromaschine

Also Published As

Publication number Publication date
ES502872A0 (es) 1982-04-01
ES8301024A1 (es) 1982-04-01

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Legal Events

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

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AK Designated contracting states

Designated state(s): AT DE FR

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

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18D Application deemed to be withdrawn

Effective date: 19821016

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WAGNER, ROBERT JOHN