SE8903514L - DEVICE TO MAKE CHANGES IN THE MASS - Google Patents

DEVICE TO MAKE CHANGES IN THE MASS

Info

Publication number
SE8903514L
SE8903514L SE8903514A SE8903514A SE8903514L SE 8903514 L SE8903514 L SE 8903514L SE 8903514 A SE8903514 A SE 8903514A SE 8903514 A SE8903514 A SE 8903514A SE 8903514 L SE8903514 L SE 8903514L
Authority
SE
Sweden
Prior art keywords
indicator part
mass
changes
thin
resonant frequency
Prior art date
Application number
SE8903514A
Other languages
Swedish (sv)
Other versions
SE466622B (en
SE8903514D0 (en
Inventor
K-E Andersson
Original Assignee
Abb Stal Ab
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 Abb Stal Ab filed Critical Abb Stal Ab
Priority to SE8903514A priority Critical patent/SE466622B/en
Publication of SE8903514D0 publication Critical patent/SE8903514D0/en
Publication of SE8903514L publication Critical patent/SE8903514L/en
Publication of SE466622B publication Critical patent/SE466622B/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

Measuring arrangement for, in ducts or vessels containing liquid or gaseous medium, monitoring changes in mass, for example as a result of erosion, corrosion or deposition, on walls 10 or other components exposed to the medium, comprising an indicator part 11, a detector part 12 and a member 13 for exciting the indicator part. The indicator part is arranged so as to be set in vibration and changes in the resonant frequency of the indicator part are used as a measure of changes in mass. Arranged on the indicator part is a temperature sensor in order to distinguish the effect on the resonant frequency as a result of changes in mass caused by temperature variations. The indicator part comprises a thin-walled section 14 which connects a fastening part 15 to a body 16, the body having a considerably greater material thickness than the thin-walled section. The body is designed with a profile and made of a material essentially the same as the component which is being monitored, and the body is arranged in the duct or the vessel so that the medium influences its mass, the resonant frequency of the indicator part being changed under essentially the same circumstances as for the component being monitored. The measuring sensitivity is determined by adapting the length and the material thickness of the thin-walled section. <IMAGE>
SE8903514A 1989-10-24 1989-10-24 Arrangement for measuring changes in mass by detecting resonant frequency SE466622B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE8903514A SE466622B (en) 1989-10-24 1989-10-24 Arrangement for measuring changes in mass by detecting resonant frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8903514A SE466622B (en) 1989-10-24 1989-10-24 Arrangement for measuring changes in mass by detecting resonant frequency

Publications (3)

Publication Number Publication Date
SE8903514D0 SE8903514D0 (en) 1989-10-24
SE8903514L true SE8903514L (en) 1991-04-25
SE466622B SE466622B (en) 1992-03-09

Family

ID=20377251

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8903514A SE466622B (en) 1989-10-24 1989-10-24 Arrangement for measuring changes in mass by detecting resonant frequency

Country Status (1)

Country Link
SE (1) SE466622B (en)

Also Published As

Publication number Publication date
SE466622B (en) 1992-03-09
SE8903514D0 (en) 1989-10-24

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