FR2425632A1 - ACOUSTIC INTENSITY MEASURING DEVICE - Google Patents

ACOUSTIC INTENSITY MEASURING DEVICE

Info

Publication number
FR2425632A1
FR2425632A1 FR7813863A FR7813863A FR2425632A1 FR 2425632 A1 FR2425632 A1 FR 2425632A1 FR 7813863 A FR7813863 A FR 7813863A FR 7813863 A FR7813863 A FR 7813863A FR 2425632 A1 FR2425632 A1 FR 2425632A1
Authority
FR
France
Prior art keywords
measuring device
signals
intensity measuring
acoustic intensity
fourier transforms
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
FR7813863A
Other languages
French (fr)
Other versions
FR2425632B1 (en
Inventor
Jean-Michel Lambert
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.)
Centre Technique des Industries Mecaniques CETIM
Original Assignee
Centre Technique des Industries Mecaniques CETIM
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 Centre Technique des Industries Mecaniques CETIM filed Critical Centre Technique des Industries Mecaniques CETIM
Priority to FR7813863A priority Critical patent/FR2425632A1/en
Priority to GB7914423A priority patent/GB2020807B/en
Priority to NL7903446A priority patent/NL7903446A/en
Priority to CH421779A priority patent/CH631262A5/en
Priority to DK191979A priority patent/DK191979A/en
Priority to DE19792918947 priority patent/DE2918947A1/en
Publication of FR2425632A1 publication Critical patent/FR2425632A1/en
Application granted granted Critical
Publication of FR2425632B1 publication Critical patent/FR2425632B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/04—Frequency
    • G01H3/08—Analysing frequencies present in complex vibrations, e.g. comparing harmonics present

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

L'INVENTION CONCERNE LES MESURES ACOUSTIQUES. UN DISPOSITIF SELON L'INVENTION COMPREND UN OU DEUX COUPLES DE DEUX MICROPHONES ACCOLES DOS A DOS, DES MOYENS DE CONVERSION ANALOGIQUE-NUMERIQUE POUR ETABLIR UNE SERIE DE CODES NUMERIQUES CARACTERISTIQUES, DES SIGNAUX EN DES INSTANTS SUCCESSIFS DIFFERENTS, ET DES MOYENS DE CALCUL AUTOMATIQUE, A PARTIR DE CES CODES NUMERIQUES, DES TRANSFORMEES DE FOURIER REPRESENTATIVES DE CHACUN DES SIGNAUX, ET DES INTENSITES ACOUSTIQUES CORRESPONDANT A CHACUNE DES FREQUENCES DES TRANSFORMEES DE FOURIER DES DEUX SIGNAUX. APPLICATION A L'ETUDE DES BRUITS DE MACHINES.THE INVENTION CONCERNS ACOUSTIC MEASUREMENTS. A DEVICE ACCORDING TO THE INVENTION INCLUDES ONE OR TWO COUPLES OF TWO MICROPHONES ACCOMPANIED BACK TO BACK, ANALOGUE-DIGITAL CONVERSION MEANS FOR ESTABLISHING A SERIES OF CHARACTERISTIC NUMERIC CODES, SIGNALS AT DIFFERENT SUCCESSIVE INSTANTS, AND AUTOMATIC CALCULATION MEANS, FROM THESE NUMERICAL CODES, FOURIER TRANSFORMS REPRESENTATIVE OF EACH SIGNAL, AND ACOUSTIC INTENSITIES CORRESPONDING TO EACH OF THE FREQUENCIES OF THE FOURIER TRANSFORMS OF THE TWO SIGNALS. APPLICATION TO THE STUDY OF MACHINE NOISE.

FR7813863A 1978-05-10 1978-05-10 ACOUSTIC INTENSITY MEASURING DEVICE Granted FR2425632A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR7813863A FR2425632A1 (en) 1978-05-10 1978-05-10 ACOUSTIC INTENSITY MEASURING DEVICE
GB7914423A GB2020807B (en) 1978-05-10 1979-04-25 Apparatus for measuring acoustic intensity
NL7903446A NL7903446A (en) 1978-05-10 1979-05-02 SOUND POWER MEASUREMENT DEVICE.
CH421779A CH631262A5 (en) 1978-05-10 1979-05-04 SOUND ACTION MEASURING DEVICE.
DK191979A DK191979A (en) 1978-05-10 1979-05-09 APPARATUS FOR MEASUREMENT OF SOUND INTENSITY
DE19792918947 DE2918947A1 (en) 1978-05-10 1979-05-10 DEVICE FOR MEASURING THE ACOUSTIC INTENSITY

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7813863A FR2425632A1 (en) 1978-05-10 1978-05-10 ACOUSTIC INTENSITY MEASURING DEVICE

Publications (2)

Publication Number Publication Date
FR2425632A1 true FR2425632A1 (en) 1979-12-07
FR2425632B1 FR2425632B1 (en) 1981-07-17

Family

ID=9208096

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7813863A Granted FR2425632A1 (en) 1978-05-10 1978-05-10 ACOUSTIC INTENSITY MEASURING DEVICE

Country Status (6)

Country Link
CH (1) CH631262A5 (en)
DE (1) DE2918947A1 (en)
DK (1) DK191979A (en)
FR (1) FR2425632A1 (en)
GB (1) GB2020807B (en)
NL (1) NL7903446A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5961721A (en) * 1982-10-01 1984-04-09 Bridgestone Corp Method and apparatus for searching sound source
JPS5979852A (en) * 1982-10-29 1984-05-09 Asahi Chem Ind Co Ltd Apparatus for detecting microscopic destruction
US4665494A (en) * 1982-12-17 1987-05-12 Victor Company Of Japan, Limited Spectrum display device for audio signals
JP5123843B2 (en) * 2005-03-16 2013-01-23 コクス，ジェイムズ Microphone array and digital signal processing system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
NV2045/77 *
NV8014/77 *
NV8033/75 *

Also Published As

Publication number Publication date
NL7903446A (en) 1979-11-13
FR2425632B1 (en) 1981-07-17
GB2020807A (en) 1979-11-21
DE2918947A1 (en) 1979-11-22
CH631262A5 (en) 1982-07-30
GB2020807B (en) 1982-10-06
DK191979A (en) 1979-11-11

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Legal Events

Date Code Title Description
ST Notification of lapse