JPS5611353A - Eddy current check unit - Google Patents
Eddy current check unitInfo
- Publication number
- JPS5611353A JPS5611353A JP8675279A JP8675279A JPS5611353A JP S5611353 A JPS5611353 A JP S5611353A JP 8675279 A JP8675279 A JP 8675279A JP 8675279 A JP8675279 A JP 8675279A JP S5611353 A JPS5611353 A JP S5611353A
- Authority
- JP
- Japan
- Prior art keywords
- output
- voltages
- circuit
- amplifiers
- eddy current
- 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
Links
Abstract
PURPOSE: To make it possible that the response speed for switching is high, by using a semiconductor variable resistance element such as the field effect transistor for the input signal circuit to the adding circuit in the circuit which cancels the output of an eddy current detector.
CONSTITUTION: A part of output voltage of phase detecting circuits 4 and 4' is input to bias adjusting and output amplifiers 305 and 305', and another part is input to similar amplifiers 306 and 306' after inverting the polarity of output voltages. In case that a detection output appears from eddy current detector 2, output voltages of bias adjusting and output amplifiers 305 and 306 and similar amplifiers 305' and 306' are changed to voltages of directions opposite to each other respectively with fixed bias voltages as the center, and these output voltages are applied to gates G of FET307, 308, 307' and 308' respectivey, and therefore, output voltages at connection points between FET307, 308 and between FET307' and 308' are changed. Cancelling circuit 30 functions by inputting these output voltages to adding circuit 301. The response speed for switching can be high by constituting the cancelling circuit electronically purely in this manner.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8675279A JPS5611353A (en) | 1979-07-09 | 1979-07-09 | Eddy current check unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8675279A JPS5611353A (en) | 1979-07-09 | 1979-07-09 | Eddy current check unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5611353A true JPS5611353A (en) | 1981-02-04 |
Family
ID=13895488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8675279A Pending JPS5611353A (en) | 1979-07-09 | 1979-07-09 | Eddy current check unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5611353A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59231448A (en) * | 1983-06-15 | 1984-12-26 | Nippon Steel Corp | Calibrating device of eddy current flaw detection apparatus |
US5812389A (en) * | 1988-12-23 | 1998-09-22 | Hitachi, Ltd. | Power distribution control system |
-
1979
- 1979-07-09 JP JP8675279A patent/JPS5611353A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59231448A (en) * | 1983-06-15 | 1984-12-26 | Nippon Steel Corp | Calibrating device of eddy current flaw detection apparatus |
JPH0340827B2 (en) * | 1983-06-15 | 1991-06-20 | ||
US5812389A (en) * | 1988-12-23 | 1998-09-22 | Hitachi, Ltd. | Power distribution control system |
US6073054A (en) * | 1988-12-23 | 2000-06-06 | Hitachi, Ltd. | Information processing system |
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