GB1344613A - Surface displacement detection apparatus - Google Patents

Surface displacement detection apparatus

Info

Publication number
GB1344613A
GB1344613A GB1344613DA GB1344613A GB 1344613 A GB1344613 A GB 1344613A GB 1344613D A GB1344613D A GB 1344613DA GB 1344613 A GB1344613 A GB 1344613A
Authority
GB
United Kingdom
Prior art keywords
departure
frequency
photo
vibration
indicate
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
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.)
British Aircraft Corp Ltd
Original Assignee
British Aircraft Corp 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 British Aircraft Corp Ltd filed Critical British Aircraft Corp Ltd
Publication of GB1344613A publication Critical patent/GB1344613A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • G01P3/366—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light by using diffraction of light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

1344613 Photo-electric detection and measurement BRITISH AIRCRAFT CORP Ltd 11 May 1971 [12 Feb 1970] 6861/70 Heading G1A In an apparatus for detecting a departure of a monitored area of a surface from a datum plane 2A, Fig.2, two beams A. B derived by a beam splitter 6 from a source 1 of coherent light such as a laser are arranged to converge at a small angle and focus upon the datum plane at two spaced points 20, 21 in order to produce spatial optical fringe pattern in the scattered light, and any change in the pitch of the fringe pattern is detected to indicate a departure. The arrangement may indicate the occurrence of a departure, or its degree, and may be used to monitor the frequency and or amplitude of vibration of a transversely vibrating plane, an image dissector or an array of photo-diodes being used, and the frequency modulated signal produced by the frequency of vibration being demodulated. A pair of such apparatus may be directed at the surfaces of a running web in order to detect its thickness or a change in its thickness.
GB1344613D 1971-07-20 1971-07-20 Surface displacement detection apparatus Expired GB1344613A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB686170 1971-07-20

Publications (1)

Publication Number Publication Date
GB1344613A true GB1344613A (en) 1974-01-23

Family

ID=9822098

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1344613D Expired GB1344613A (en) 1971-07-20 1971-07-20 Surface displacement detection apparatus

Country Status (1)

Country Link
GB (1) GB1344613A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215159A (en) * 1988-02-26 1989-09-13 James Donald Campbell Allan Detecting change in location of a moving source of electromagnetic radiation
FR2726089A1 (en) * 1994-10-20 1996-04-26 Nelrow Sa Distance measuring system using laser source and fibre optics
WO1997037243A1 (en) * 1996-03-29 1997-10-09 Nelrow S.A. Method and distance meter for measuring distances using an offset optical laser source connected via optical fibres

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215159A (en) * 1988-02-26 1989-09-13 James Donald Campbell Allan Detecting change in location of a moving source of electromagnetic radiation
GB2215159B (en) * 1988-02-26 1992-10-14 James Donald Campbell Allan Detecting change in location of a moving source of electromagnetic radiation
FR2726089A1 (en) * 1994-10-20 1996-04-26 Nelrow Sa Distance measuring system using laser source and fibre optics
WO1997037243A1 (en) * 1996-03-29 1997-10-09 Nelrow S.A. Method and distance meter for measuring distances using an offset optical laser source connected via optical fibres

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees