JPS5478165A - Measuring method of eddy corrent type displacement - Google Patents

Measuring method of eddy corrent type displacement

Info

Publication number
JPS5478165A
JPS5478165A JP14486077A JP14486077A JPS5478165A JP S5478165 A JPS5478165 A JP S5478165A JP 14486077 A JP14486077 A JP 14486077A JP 14486077 A JP14486077 A JP 14486077A JP S5478165 A JPS5478165 A JP S5478165A
Authority
JP
Japan
Prior art keywords
frequencies
coils
displacements
eddy
signals
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.)
Pending
Application number
JP14486077A
Other languages
Japanese (ja)
Inventor
Shinichi Murakawa
Masahiro Fujiwara
Isao Mitsutaka
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP14486077A priority Critical patent/JPS5478165A/en
Publication of JPS5478165A publication Critical patent/JPS5478165A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

PURPOSE: To prevent the effect of interference between detection coils by exciting a plurality of eddy current detecting coils respectively with signals of frequencies differing even times and measruing displacements.
CONSTITUTION: Eddy current detecting coils 2, 2' are excited respectively by the cuttents through power amplifiers 4, 4' of frequencies varying even times such as frequencies f0, 2f0, etc. by osicllators 3, 3' and bridge circuits. As a result, the magnetic flux changes of the coils 2,2' by the eddy currents being generated in correspondence to the displacements of the object 1 are detected and the bridge circuits 5, 5' become unbalanced, thereby generating the unbalanced voltagea owing to impedance changes. The voltages are locked at the frequencies f0, 2f0 by the lock-in amplifiers 6, 6' with the signals of the frequencies f0, 2f0 being outputted by the oscillators 3, 3' as reference signals. Hence, the DC voltages corresponding to the displacements of the object free from any effect of mutual interferences of the coils 2, 2' are detected from linearizers 7, 7', whereby the easy and accurate measurement may be performed without making any calibration and correction.
COPYRIGHT: (C)1979,JPO&Japio
JP14486077A 1977-12-02 1977-12-02 Measuring method of eddy corrent type displacement Pending JPS5478165A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14486077A JPS5478165A (en) 1977-12-02 1977-12-02 Measuring method of eddy corrent type displacement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14486077A JPS5478165A (en) 1977-12-02 1977-12-02 Measuring method of eddy corrent type displacement

Publications (1)

Publication Number Publication Date
JPS5478165A true JPS5478165A (en) 1979-06-22

Family

ID=15372075

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14486077A Pending JPS5478165A (en) 1977-12-02 1977-12-02 Measuring method of eddy corrent type displacement

Country Status (1)

Country Link
JP (1) JPS5478165A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5952204U (en) * 1982-09-30 1984-04-06 カヤバ工業株式会社 fluid pressure cylinder
JPS62261913A (en) * 1986-05-02 1987-11-14 アプライド・パワ−・インコ−ポレ−テツド Deflection measuring system
JPS6315127A (en) * 1986-07-07 1988-01-22 Toyo Commun Equip Co Ltd Temperature or pressure measuring apparatus
WO2017191709A1 (en) * 2016-05-02 2017-11-09 日立オートモティブシステムズ株式会社 Position detection sensor, position detection system using said position detection sensor, and belt-type continuously variable transmission provided with said position detection sensor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5952204U (en) * 1982-09-30 1984-04-06 カヤバ工業株式会社 fluid pressure cylinder
JPH0217281Y2 (en) * 1982-09-30 1990-05-15
JPS62261913A (en) * 1986-05-02 1987-11-14 アプライド・パワ−・インコ−ポレ−テツド Deflection measuring system
JPS6315127A (en) * 1986-07-07 1988-01-22 Toyo Commun Equip Co Ltd Temperature or pressure measuring apparatus
WO2017191709A1 (en) * 2016-05-02 2017-11-09 日立オートモティブシステムズ株式会社 Position detection sensor, position detection system using said position detection sensor, and belt-type continuously variable transmission provided with said position detection sensor

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