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GB871912A - Method and apparatus for detecting hidden flaws in sheet like structures - Google Patents

Method and apparatus for detecting hidden flaws in sheet like structures

Info

Publication number
GB871912A
GB871912A GB30962/59A GB3096259A GB871912A GB 871912 A GB871912 A GB 871912A GB 30962/59 A GB30962/59 A GB 30962/59A GB 3096259 A GB3096259 A GB 3096259A GB 871912 A GB871912 A GB 871912A
Authority
GB
United Kingdom
Prior art keywords
brush
panels
switch
housing
microphone
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
GB30962/59A
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.)
Canadian Patents and Development Ltd
Original Assignee
Canadian Patents and Development Ltd
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 Canadian Patents and Development Ltd filed Critical Canadian Patents and Development Ltd
Publication of GB871912A publication Critical patent/GB871912A/en
Expired legal-status Critical Current

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
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
    • 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)
  • 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)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

871,912. Sonic inspection devices. CANADIAN PATENTS & DEVELOPMENT Ltd. Sept. 10, 1959 [Oct. 3, 1958], No. 30962/59. Class 40(7) [Also in Groups XIX and XL(b) ] A sheet of material is tested for flaws by converting a part of the sound generated by rubbing a brush on its surface into an electric signal and indicating any difference between the amplitude of that signal after frequency-filtering and a predetermined amplitude. Panels 10 Fig. 1 of plywood are conveyed through the testing apparatus by rollers 11 . . . 14 and a brush 21 is rotated by motor 22 and is traversed across the panels. The brush is mounted in a housing having a cover 47 Fig. 3 lined with sound-absorbing felt 49 to insulate microphone 36 from external noise. The microphone output passes to a band-pass filter 39 centred on 8 kc./s. via a photo-electric switch 81. When the filter output departs from a predetermined level, due to the change in acoustic impedance of the panel portion encompassed by the brush by a flaw (e.g. between the plies), solenoid 41 causes plunger 42 to depress lead 46 which marks the plywood surface. To obviate relay 40 operation when the gap between panels reaches the brush housing a photo-cell 81 Fig. 6, to which is directed light from source 80, opens switch 81. To prevent the brush housing dropping between long gaps between panels, a roller 74 on arm 100 of a switch 70 is provided; the switch when operated energizes solenoid 71 the plunger 75 of which causes one end of carriage frame 20 of the brush housing to be forced upward. In another embodiment stationary brush and microphone units are employed each having the apparatus depicted in Fig. 3, Fig. 2 (not shown); in a modification each brush is fixed and reactangular in cross-section, Figs. 4 and 5 (not shown), a high panel feed speed being employed to ensure sufficient sound energy production.
GB30962/59A 1958-10-03 1959-09-10 Method and apparatus for detecting hidden flaws in sheet like structures Expired GB871912A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA871912X 1958-10-03

Publications (1)

Publication Number Publication Date
GB871912A true GB871912A (en) 1961-07-05

Family

ID=4172744

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30962/59A Expired GB871912A (en) 1958-10-03 1959-09-10 Method and apparatus for detecting hidden flaws in sheet like structures

Country Status (3)

Country Link
DE (1) DE1187395B (en)
FR (1) FR1236870A (en)
GB (1) GB871912A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5115500Y1 (en) * 1970-10-26 1976-04-23

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746405C (en) * 1937-04-02 1944-08-03 Dr Richard Seiler Method for detecting defects in workpieces
DE760830C (en) * 1941-07-26 1953-11-02 Aeg Photoelectric device for the detection of pinholes in steel belts with an electromagnetic marking device
DE849022C (en) * 1944-01-30 1952-09-11 Siemens Ag Method for testing the setting of glue spots when gluing wood, especially high-frequency gluing
US2582437A (en) * 1947-05-10 1952-01-15 Maurycy Brokman Electromagnetic testing device for steel ropes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5115500Y1 (en) * 1970-10-26 1976-04-23

Also Published As

Publication number Publication date
DE1187395B (en) 1965-02-18
FR1236870A (en) 1960-07-22

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