FR2306437A2 - Oscillating bar frequency measuring device - uses change of magnetisation caused by change of length and length of bar may be adjusted - Google Patents

Oscillating bar frequency measuring device - uses change of magnetisation caused by change of length and length of bar may be adjusted

Info

Publication number
FR2306437A2
FR2306437A2 FR7510602A FR7510602A FR2306437A2 FR 2306437 A2 FR2306437 A2 FR 2306437A2 FR 7510602 A FR7510602 A FR 7510602A FR 7510602 A FR7510602 A FR 7510602A FR 2306437 A2 FR2306437 A2 FR 2306437A2
Authority
FR
France
Prior art keywords
bar
length
change
oscillation
adjusted
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
FR7510602A
Other languages
French (fr)
Other versions
FR2306437B2 (en
Inventor
Michel Georges Berniere
Didier Marcel Beaudet
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.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
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 Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Priority to FR7510602A priority Critical patent/FR2306437A2/en
Priority to US05/590,034 priority patent/US4012870A/en
Priority to DE2528575A priority patent/DE2528575B2/en
Publication of FR2306437A2 publication Critical patent/FR2306437A2/en
Application granted granted Critical
Publication of FR2306437B2 publication Critical patent/FR2306437B2/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
    • G01R33/18—Measuring magnetostrictive properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H13/00—Measuring resonant frequency

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The bar (1) may be part of an oscillator or an electro-mechanical frequency filter. The bar is placed in free oscillation in a constant magnetic field and is exposed to an external exciting force so that the resulting frequency of oscillation can be measured. Oscillation of the bar may be by a mechanical impact at one end or by means of an electric shock. The length of the bar may be adjusted to control the frequency by means of a material removing tool controlled automatically with feedback from the oscillation frequency. Air may be blown through a channel with a right angled bend (51), to excite the oscillation.
FR7510602A 1974-07-03 1975-04-04 Oscillating bar frequency measuring device - uses change of magnetisation caused by change of length and length of bar may be adjusted Granted FR2306437A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7510602A FR2306437A2 (en) 1975-04-04 1975-04-04 Oscillating bar frequency measuring device - uses change of magnetisation caused by change of length and length of bar may be adjusted
US05/590,034 US4012870A (en) 1974-07-03 1975-06-25 Apparatus for measuring and changing vibration frequency of metal B
DE2528575A DE2528575B2 (en) 1974-07-03 1975-06-26 Device for measuring and, if necessary, changing the natural oscillation frequencies of a metallic rod

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7510602A FR2306437A2 (en) 1975-04-04 1975-04-04 Oscillating bar frequency measuring device - uses change of magnetisation caused by change of length and length of bar may be adjusted

Publications (2)

Publication Number Publication Date
FR2306437A2 true FR2306437A2 (en) 1976-10-29
FR2306437B2 FR2306437B2 (en) 1978-12-01

Family

ID=9153541

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7510602A Granted FR2306437A2 (en) 1974-07-03 1975-04-04 Oscillating bar frequency measuring device - uses change of magnetisation caused by change of length and length of bar may be adjusted

Country Status (1)

Country Link
FR (1) FR2306437A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2413643A2 (en) * 1977-12-28 1979-07-27 Lignes Telegraph Telephon Mechanical resonator resonance frequency measuring device - has two coils with voltage input of one being amplified and filtered, and uses magnetic impulses

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2413643A2 (en) * 1977-12-28 1979-07-27 Lignes Telegraph Telephon Mechanical resonator resonance frequency measuring device - has two coils with voltage input of one being amplified and filtered, and uses magnetic impulses

Also Published As

Publication number Publication date
FR2306437B2 (en) 1978-12-01

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