JPS54143678A - Eddy current type velocity measuring apparatus - Google Patents

Eddy current type velocity measuring apparatus

Info

Publication number
JPS54143678A
JPS54143678A JP5208178A JP5208178A JPS54143678A JP S54143678 A JPS54143678 A JP S54143678A JP 5208178 A JP5208178 A JP 5208178A JP 5208178 A JP5208178 A JP 5208178A JP S54143678 A JPS54143678 A JP S54143678A
Authority
JP
Japan
Prior art keywords
phase shift
output signal
temperature
conductive material
amplification
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
JP5208178A
Other languages
Japanese (ja)
Inventor
Masaaki Hirayama
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5208178A priority Critical patent/JPS54143678A/en
Publication of JPS54143678A publication Critical patent/JPS54143678A/en
Pending legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE: To obviate receiving the influence of unbalance residual voltage even if the temperature of the conductive material to be measured changes by adjusting the amplification factor and phase shift quantity of a phase shift circuit so that the output signal of a subtractor becomes zero thereby performing zero adjustment in the state where the conductive material is still.
CONSTITUTION: The output signals E1, E2 of detecting coils 1 and 2 are amplified to B1E1, B1E2, which are then subjected to differential amplification and cumulative amplification and respectively B1B2EΔ and B1B2'ET are outputted. The output signal B1B2'ET of an operational amplifier 20 is inputted to a phase shift circuit 21 of amplification factor B3 and d of phase shift quantity of become B1B2'B3ejα ET, which is then outputted and is applied to the input part + side of a differential operation amplifier 14. If the amplification factor B3 and phase shift quantity α of the phase shift circuit 21 are so adjusted that the output signal of a rectifier circuit 15 becomes zero while the conductive material to be measured is still, the influence of the unbalance residual voltage does not appear in the output signal of the rectifier circuit 15 even if the temperature of the material to be measured changes to a temperature differing from the temperature at the zero adjustment when it is moving at a certain speed.
COPYRIGHT: (C)1979,JPO&Japio
JP5208178A 1978-04-29 1978-04-29 Eddy current type velocity measuring apparatus Pending JPS54143678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5208178A JPS54143678A (en) 1978-04-29 1978-04-29 Eddy current type velocity measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5208178A JPS54143678A (en) 1978-04-29 1978-04-29 Eddy current type velocity measuring apparatus

Publications (1)

Publication Number Publication Date
JPS54143678A true JPS54143678A (en) 1979-11-09

Family

ID=12904862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5208178A Pending JPS54143678A (en) 1978-04-29 1978-04-29 Eddy current type velocity measuring apparatus

Country Status (1)

Country Link
JP (1) JPS54143678A (en)

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