FR2254996A5 - Method of measuring small phenomena - involves comparing beam modified by phenomenon with reference - Google Patents

Method of measuring small phenomena - involves comparing beam modified by phenomenon with reference

Info

Publication number
FR2254996A5
FR2254996A5 FR7345160A FR7345160A FR2254996A5 FR 2254996 A5 FR2254996 A5 FR 2254996A5 FR 7345160 A FR7345160 A FR 7345160A FR 7345160 A FR7345160 A FR 7345160A FR 2254996 A5 FR2254996 A5 FR 2254996A5
Authority
FR
France
Prior art keywords
phenomenon
phase
detector
involves comparing
measuring small
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
FR7345160A
Other languages
French (fr)
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.)
MINISINI PIERRE FR
Original Assignee
MINISINI PIERRE FR
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 MINISINI PIERRE FR filed Critical MINISINI PIERRE FR
Priority to FR7345160A priority Critical patent/FR2254996A5/en
Application granted granted Critical
Publication of FR2254996A5 publication Critical patent/FR2254996A5/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • G02F2/002—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light using optical mixing
    • 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
    • G01B9/02001—Interferometers characterised by controlling or generating intrinsic radiation properties
    • G01B9/0201—Interferometers characterised by controlling or generating intrinsic radiation properties using temporal phase variation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
    • 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
    • G01B2290/40—Non-mechanical variable delay line

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (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)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The initial beam is split into two (A, B) in a beam splitter (2). One beam (A) is used to study the phenomenon (P) and the other beam (B) undergoes a linear phase rotation using an electro-optic crystal (3) and the beam modified by the phenomenon under investigation is allowed to interfere with the phase rotated beam on a detector (7). The electrical signal produced by this detector is applied to a phase-sensitive detector (8) which provides a final output signal which is characteristic of the modification introduced by the phenomenon (P). An electronic generator (9) and a signal shaping unit (10) are used to obtain the phase rotation of one of the beams and to obtain also a reference signal for the phase-sensitive detector (8).
FR7345160A 1973-12-18 1973-12-18 Method of measuring small phenomena - involves comparing beam modified by phenomenon with reference Expired FR2254996A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7345160A FR2254996A5 (en) 1973-12-18 1973-12-18 Method of measuring small phenomena - involves comparing beam modified by phenomenon with reference

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7345160A FR2254996A5 (en) 1973-12-18 1973-12-18 Method of measuring small phenomena - involves comparing beam modified by phenomenon with reference

Publications (1)

Publication Number Publication Date
FR2254996A5 true FR2254996A5 (en) 1975-07-11

Family

ID=9129359

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7345160A Expired FR2254996A5 (en) 1973-12-18 1973-12-18 Method of measuring small phenomena - involves comparing beam modified by phenomenon with reference

Country Status (1)

Country Link
FR (1) FR2254996A5 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514959A1 (en) * 1981-10-16 1983-04-22 Cilas HETERODYNE DETECTION TRANSMITTER-RECEIVER LASER DEVICE
EP0108497A1 (en) * 1982-10-08 1984-05-16 National Research Development Corporation Irradiative probe system
FR2697336A1 (en) * 1992-10-28 1994-04-29 Inst Francais Du Petrole Method and device for differential measurement of refractive indices and associated use.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514959A1 (en) * 1981-10-16 1983-04-22 Cilas HETERODYNE DETECTION TRANSMITTER-RECEIVER LASER DEVICE
EP0108497A1 (en) * 1982-10-08 1984-05-16 National Research Development Corporation Irradiative probe system
US4741620A (en) * 1982-10-08 1988-05-03 National Research Development Corporation Irradiative probe system
FR2697336A1 (en) * 1992-10-28 1994-04-29 Inst Francais Du Petrole Method and device for differential measurement of refractive indices and associated use.
WO1994010552A1 (en) * 1992-10-28 1994-05-11 Institut Français Du Petrole Process and device for the differential measurement of refraction indexes and use thereof

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Legal Events

Date Code Title Description
ST Notification of lapse