GB1243359A - Detection of small displacements - Google Patents

Detection of small displacements

Info

Publication number
GB1243359A
GB1243359A GB5316468A GB5316468A GB1243359A GB 1243359 A GB1243359 A GB 1243359A GB 5316468 A GB5316468 A GB 5316468A GB 5316468 A GB5316468 A GB 5316468A GB 1243359 A GB1243359 A GB 1243359A
Authority
GB
United Kingdom
Prior art keywords
mirror
interferometer
signal
high frequency
nov
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
GB5316468A
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.)
Alcatel Lucent SAS
Original Assignee
Compagnie Generale dElectricite SA
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 Compagnie Generale dElectricite SA filed Critical Compagnie Generale dElectricite SA
Publication of GB1243359A publication Critical patent/GB1243359A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00—Measuring instruments characterised by the use of optical techniques
    • G01B9/02—Interferometers
    • G01B9/02055—Reduction or prevention of errors; Testing; Calibration
    • G01B9/02075—Reduction or prevention of errors; Testing; Calibration of particular errors
    • G01B9/02078—Caused by ambiguity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00—Measuring instruments characterised by the use of optical techniques
    • G01B9/02—Interferometers
    • G01B9/02055—Reduction or prevention of errors; Testing; Calibration
    • G01B9/02062—Active error reduction, i.e. varying with time
    • G01B9/02067—Active error reduction, i.e. varying with time by electronic control systems, i.e. using feedback acting on optics or light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B2290/00—Aspects of interferometers not specifically covered by any group under G01B9/02
    • G01B2290/25—Fabry-Perot in interferometer, e.g. etalon, cavity

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Optics & Photonics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)
  • Lasers (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

1,243,359. Light modulators. COMPAGNIE GENERAL D'ELECTRICITE. 8 Nov., 1968 [10 Nov., 1967], No. 53164/68. Heading H4F. [Also in Divisions G1 and G2] Small displacements are detected by coupling them to one mirror of a Fabry-Perot interferometer, detecting the intensity of light passing through or reflected from the interferometer, feeding back a signal to a transducer tending to keep the variations in mirror spacing less than #/4 and using the fed back signal as an indication of the displacements. The interferometer 1, which is illuminated by a He-Ne laser 4, comprises mirrors 8 and 9 coupled to a piezoelectric ceramic or magnetostrictive cylinder 16 rigidly and by a diaphragm 11 respectively. The light intensity emerging at 10<SP>1</SP> or 10<SP>11</SP> is measured by a photo-cell 12 and compared with a reference signal from a photocell 7 and any difference energizes the cylinder 16 to reduce the difference. The laser may be modulated at a high frequency to facilitate amplification, the high frequency signal being filtered out of the feed back loop. Microphones.-Sound vibrations incident upon the mirror 9 produce corresponding signals at the output S. For high frequency response the interferometer is supported at the mirror 8 end and is vented to the atmosphere. For low frequency response, it is supported at the other end; fluid-tight and provided with a smaller aperture diaphragm. The device may be used as an accelerometer by using the mirror 9 or a body attached thereto as seismic mass.
GB5316468A 1967-11-10 1968-11-08 Detection of small displacements Expired GB1243359A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR127817 1967-11-10

Publications (1)

Publication Number Publication Date
GB1243359A true GB1243359A (en) 1971-08-18

Family

ID=8641565

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5316468A Expired GB1243359A (en) 1967-11-10 1968-11-08 Detection of small displacements

Country Status (5)

Country Link
BE (1) BE722797A (en)
DE (1) DE1807876A1 (en)
FR (1) FR1555697A (en)
GB (1) GB1243359A (en)
NL (1) NL6815932A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538195A1 (en) * 1982-12-16 1984-06-22 Int Standard Electric Corp Method and system of optical transmission.
WO2007100957A1 (en) * 2006-03-02 2007-09-07 Symphony Acoustics, Inc. Apparatus comprising a high-signal-to-noise displacement sensor and method therefore
US7583390B2 (en) 2006-03-02 2009-09-01 Symphony Acoustics, Inc. Accelerometer comprising an optically resonant cavity
CN102833661A (en) * 2012-08-15 2012-12-19 温州泛波激光有限公司 Laser microphone

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3116346A1 (en) * 1980-05-01 1982-03-04 National Research Development Corp., London DEVICE FOR MEASURING THE SOUND VOLUME OR OF VOLUME FLOW, IN PARTICULAR IN THE LOW AREA OF NANOLITERS PER SECOND
DE3142164A1 (en) * 1980-10-27 1982-06-16 Rosemount Engineering Co. Ltd., Bognor Regis, Sussex DEVICE FOR MEASURING PRESSURE DIFFERENCES
JPS61235731A (en) * 1985-04-11 1986-10-21 Sharp Corp Pressure sensing element
JPS6230921A (en) * 1985-07-31 1987-02-09 Sharp Corp Optical sensor
DE3709253A1 (en) * 1987-03-20 1988-09-29 Fraunhofer Ges Forschung Fabry Perot sensor
FR2640456A1 (en) * 1988-12-13 1990-06-15 Science Tec MICROPHONE WITH INTERFEROMETRIC SOUND PRESSURE DETECTION
DE4125485C2 (en) * 1991-08-01 1994-05-19 Deutsche Aerospace Method and arrangement for measuring the smallest deflections

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538195A1 (en) * 1982-12-16 1984-06-22 Int Standard Electric Corp Method and system of optical transmission.
WO2007100957A1 (en) * 2006-03-02 2007-09-07 Symphony Acoustics, Inc. Apparatus comprising a high-signal-to-noise displacement sensor and method therefore
US7583390B2 (en) 2006-03-02 2009-09-01 Symphony Acoustics, Inc. Accelerometer comprising an optically resonant cavity
CN102833661A (en) * 2012-08-15 2012-12-19 温州泛波激光有限公司 Laser microphone
CN102833661B (en) * 2012-08-15 2016-08-03 温州泛波激光有限公司 A kind of laser microphone

Also Published As

Publication number Publication date
NL6815932A (en) 1969-05-13
DE1807876A1 (en) 1969-07-31
FR1555697A (en) 1969-01-31
BE722797A (en) 1969-04-24

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