GB1517533A - Stress wave emission analysis systems - Google Patents

Stress wave emission analysis systems

Info

Publication number
GB1517533A
GB1517533A GB1378975A GB1378975A GB1517533A GB 1517533 A GB1517533 A GB 1517533A GB 1378975 A GB1378975 A GB 1378975A GB 1378975 A GB1378975 A GB 1378975A GB 1517533 A GB1517533 A GB 1517533A
Authority
GB
United Kingdom
Prior art keywords
burst
stress wave
amplitude
emission analysis
peak
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.)
Expired
Application number
GB1378975A
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB1378975A priority Critical patent/GB1517533A/en
Publication of GB1517533A publication Critical patent/GB1517533A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • 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
    • G01N29/14—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 using acoustic emission techniques

Landscapes

  • Physics & Mathematics (AREA)
  • General 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)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

1517533 Stress wave emission analysis; flaw detection M N BENTLEY and A G DENHAM 1 April 1976 [3 April 1975(2)] 13789/75 and 13790/75 Addition to 1343694 Heading G1G The nature of a propagating defect in a structure is determined by stress wave emission analysis, the method comprising detecting the arrival of a burst of stress wave.emission energy at a transducer 1 on the surface of the structure, detecting the arrival of the peak energy level of the burst by repeatedly comparing the amplitude of successive cycles of the burst with the amplitude of succeeding cycles of the same burst by a comparator 9, monostable 10 being triggered whenever the amplitude of a cycle exceeds that of its predecessor to reset the sample and hold circuit 7, whereby the final value stored at 8 is the peak value, and analyzing the form of that burst of stress wave energy, e.g. by digitizing, 17, the peak value and/or measuring the rise time between the front of the burst and its peak by counting clock pulses in counter 12. The apparatus is similar to that described in U.K. Specification 1343694. A gate may be included in the transducer output to pass only signals exceeding a predetermined minimum level.
GB1378975A 1976-04-01 1976-04-01 Stress wave emission analysis systems Expired GB1517533A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1378975A GB1517533A (en) 1976-04-01 1976-04-01 Stress wave emission analysis systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1378975A GB1517533A (en) 1976-04-01 1976-04-01 Stress wave emission analysis systems

Publications (1)

Publication Number Publication Date
GB1517533A true GB1517533A (en) 1978-07-12

Family

ID=10029409

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1378975A Expired GB1517533A (en) 1976-04-01 1976-04-01 Stress wave emission analysis systems

Country Status (1)

Country Link
GB (1) GB1517533A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939617A1 (en) * 1979-09-29 1981-04-16 Nukem Gmbh, 6450 Hanau METHOD AND DEVICE FOR PROCESSING BROADBAND SIGNALS WITH HIGH DYNAMICS
EP0037436A1 (en) * 1980-04-02 1981-10-14 Eckhard Dipl.-Ing. Roeder Process for quality control for production processes and machines
GB2129560A (en) * 1982-10-29 1984-05-16 Asahi Chemical Ind Micro fracture detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939617A1 (en) * 1979-09-29 1981-04-16 Nukem Gmbh, 6450 Hanau METHOD AND DEVICE FOR PROCESSING BROADBAND SIGNALS WITH HIGH DYNAMICS
EP0037436A1 (en) * 1980-04-02 1981-10-14 Eckhard Dipl.-Ing. Roeder Process for quality control for production processes and machines
GB2129560A (en) * 1982-10-29 1984-05-16 Asahi Chemical Ind Micro fracture detector

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee