JPS6418087A - Electromagnetic induction detector - Google Patents

Electromagnetic induction detector

Info

Publication number
JPS6418087A
JPS6418087A JP62173942A JP17394287A JPS6418087A JP S6418087 A JPS6418087 A JP S6418087A JP 62173942 A JP62173942 A JP 62173942A JP 17394287 A JP17394287 A JP 17394287A JP S6418087 A JPS6418087 A JP S6418087A
Authority
JP
Japan
Prior art keywords
rate
exciting
change
circuit
output
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
JP62173942A
Inventor
Toyofumi Tomita
Original Assignee
Toshiba Corp
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 filed Critical Toshiba Corp
Priority to JP62173942A priority Critical patent/JPS6418087A/en
Publication of JPS6418087A publication Critical patent/JPS6418087A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE:To obtain a detector which is kept low in measuring errors when impulse noise is mixed in without increasing exciting current by providing a rate-of-change limiter on the fore part of a BPF and varying limiting value by means of a phase of an exciting signal from an exciting circuit. CONSTITUTION:An exciting coil 11 is driven by alternating current signals by the use of an exciting circuit 14 and a magnetic flux 13 is generated. A detecting coil 12 detects the magnetic fluxes 13 and electromotive force is generated across it. The electromotive force is amplified by a fore amplifier 15 and input in a rate-of-change limiter 20. The rate-of-change limiter 20 varies limiting value of the rate-of-change by means of a limiting value control signal 24 obtained from the exciting circuit 14, the output 22 is converted into a direct current signal by an AC/DC converter 17 and output from an operation output circuit 18 after the output 22 is passed through a BPF 16 which passes exciting alternating current signal frequency. Therefore, noise is not transmitted to the rate-of-change limiter 20 and excessive measuring errors are prevented from occurring because large signal rate-of-change of the noise exceeds the rate-of-change allowed for the rate-of-change limiter 20 even if the excessive impulse noise is mixed in to electromotive force inducted in a detecting circuit.
JP62173942A 1987-07-14 1987-07-14 Electromagnetic induction detector Pending JPS6418087A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62173942A JPS6418087A (en) 1987-07-14 1987-07-14 Electromagnetic induction detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62173942A JPS6418087A (en) 1987-07-14 1987-07-14 Electromagnetic induction detector

Publications (1)

Publication Number Publication Date
JPS6418087A true JPS6418087A (en) 1989-01-20

Family

ID=15969923

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62173942A Pending JPS6418087A (en) 1987-07-14 1987-07-14 Electromagnetic induction detector

Country Status (1)

Country Link
JP (1) JPS6418087A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03105219A (en) * 1989-09-19 1991-05-02 Nippon Steel Corp Detection of level of molten metal
JPH03122526A (en) * 1989-10-05 1991-05-24 Nippon Steel Corp Detection of level of molten metal
JPH03138536A (en) * 1989-10-25 1991-06-12 Nippon Steel Corp Method for detecting top surface position of molten metal
EP0882594A1 (en) * 1997-06-04 1998-12-09 Hewlett-Packard Company Ink container with an inductive ink level detection machanism attached to a collapsible ink bag
WO1998055322A1 (en) * 1997-06-04 1998-12-10 Hewlett-Packard Company Ink container providing pressurized ink with ink level sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03105219A (en) * 1989-09-19 1991-05-02 Nippon Steel Corp Detection of level of molten metal
JPH03122526A (en) * 1989-10-05 1991-05-24 Nippon Steel Corp Detection of level of molten metal
JPH03138536A (en) * 1989-10-25 1991-06-12 Nippon Steel Corp Method for detecting top surface position of molten metal
US6164743A (en) * 1996-04-17 2000-12-26 Hewlett-Packard Company Ink container with an inductive ink level sense
EP0882594A1 (en) * 1997-06-04 1998-12-09 Hewlett-Packard Company Ink container with an inductive ink level detection machanism attached to a collapsible ink bag
WO1998055322A1 (en) * 1997-06-04 1998-12-10 Hewlett-Packard Company Ink container providing pressurized ink with ink level sensor
US6585359B1 (en) 1997-06-04 2003-07-01 Hewlett-Packard Development Company, L.P. Ink container providing pressurized ink with ink level sensor

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