CA2136735A1 - Magnetic measuring method and apparatus for determining the size and shape of a slot - Google Patents

Magnetic measuring method and apparatus for determining the size and shape of a slot

Info

Publication number
CA2136735A1
CA2136735A1 CA002136735A CA2136735A CA2136735A1 CA 2136735 A1 CA2136735 A1 CA 2136735A1 CA 002136735 A CA002136735 A CA 002136735A CA 2136735 A CA2136735 A CA 2136735A CA 2136735 A1 CA2136735 A1 CA 2136735A1
Authority
CA
Canada
Prior art keywords
slot
size
shape
magnetic field
determining
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.)
Granted
Application number
CA002136735A
Other languages
French (fr)
Other versions
CA2136735C (en
Inventor
Timo Varpula
Heikki Seppa
Olavi Sundstrom
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.)
Valmet Technologies Oy
Original Assignee
Individual
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
Priority claimed from FI922660A external-priority patent/FI92437C/en
Application filed by Individual filed Critical Individual
Publication of CA2136735A1 publication Critical patent/CA2136735A1/en
Application granted granted Critical
Publication of CA2136735C publication Critical patent/CA2136735C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Measuring Magnetic Variables (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The invention concerns a method and an apparatus for determining the size and shape of a slot, for measuring, e.g., the profile of the discharge opening (slice) of a paper machine. In the method, by means of at least two magnetometers (6) attached to an edge (2 and/or 5) of the slot, the magnetic field depending on the size and shape of the slot is measured. According to the invention, an alternating electrical current is applied to a current conductor (I) attached to the edge (2 and/or 5) of the slot to create an alternating magnetic field, measurement of the alternating magnetic field is phase-locked with the applied electrical current, and the size (d) and shape of the slot are calculated from the measured values of the magnetic field.
CA002136735A 1992-06-09 1993-06-09 Magnetic measuring method and apparatus for determining the size and shape of a slot Expired - Fee Related CA2136735C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI922660A FI92437C (en) 1992-06-09 1992-06-09 Magnetic measurement method for determining gap size and profile
FI922660 1992-06-09
PCT/FI1993/000251 WO1993025864A1 (en) 1992-06-09 1993-06-09 Magnetic measuring method and apparatus for determining the size and shape of a slot

Publications (2)

Publication Number Publication Date
CA2136735A1 true CA2136735A1 (en) 1993-12-23
CA2136735C CA2136735C (en) 2006-04-11

Family

ID=36178063

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002136735A Expired - Fee Related CA2136735C (en) 1992-06-09 1993-06-09 Magnetic measuring method and apparatus for determining the size and shape of a slot

Country Status (1)

Country Link
CA (1) CA2136735C (en)

Also Published As

Publication number Publication date
CA2136735C (en) 2006-04-11

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