GB1091598A - Processes and devices for measuring stresses within a transparent body for electromagnetic waves - Google Patents

Processes and devices for measuring stresses within a transparent body for electromagnetic waves

Info

Publication number
GB1091598A
GB1091598A GB4568164A GB4568164A GB1091598A GB 1091598 A GB1091598 A GB 1091598A GB 4568164 A GB4568164 A GB 4568164A GB 4568164 A GB4568164 A GB 4568164A GB 1091598 A GB1091598 A GB 1091598A
Authority
GB
United Kingdom
Prior art keywords
model
photo
point
axis
component
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
GB4568164A
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.)
Etat Francais
Original Assignee
Etat Francais
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 Etat Francais filed Critical Etat Francais
Publication of GB1091598A publication Critical patent/GB1091598A/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
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
    • 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
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/168—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of polarisation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G01L1/241—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet by photoelastic stress analysis

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

1,091,598. Photo-electric stress measurement. ETAT FRANCAIS. Nov. 9, 1964 [Nov. 12, 1963], No. 45681/64. Heading G1A. Fig. 23 shows apparatus for determining the stress pattern in a photo-elastic model M by measuring its bi-refringent properties, in which polarized light produced by the scattering within the model of the incident light beam, from source S 1 lenses L 1 - L 4 and prism P, is received upon a photo-multiplier 4, arranged perpendicularly to the incident light beam, after passing through a rotating analyzer A. The model is rotated step by step about the axis R and for each position the output of the photo-multiplier consists of a D. C. component and an A. C. component. If the D. C. component is held constant by suitable adjustment of the intensity of the incident light beam, the value of the A. C. component changes during the model rotation due to changing amplitudes of the vibrations comprising the elliptically polarized radiation and shows two maxima during one revolution of the model. These maxima correspond to the direction of the axis of the bi-refringent element considered within the model from the point at which the polarized light is produced to its point of exit from the model. By moving the prism P leftwards a small distance a similar measurement can be obtained and the difference between them gives the axis of a small element at the point corresponding to the distance traversed, or the amount by which the ellipse has been rotated by that element. The change in shape of the ellipse or the change in phase of its two vibrations from the first point of measurement to the second gives the phase angle introduced by this small element. From values of the axis and phase angles of these bi-refringent elements throughout the model the magnitudes and directions of the stresses in the model can be calculated knowing their value at one point. The model is submerged in a liquid of the same refractive index. The D. C. value of the photo-multiplier output may be controlled either by adjusting the diaphragm D 2 or the intensity of the lamp. In an arrangement using a two dimensional model Fig. 13 (not shown) the polarized light is produced external to the model by a polarizer which is rotated instead of the model, and the analyzer receives light directly transmitted through the model. The Specification gives the mathematical basis of the determination.
GB4568164A 1963-11-12 1964-11-09 Processes and devices for measuring stresses within a transparent body for electromagnetic waves Expired GB1091598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR953351A FR1383071A (en) 1963-11-12 1963-11-12 Device for measuring stresses inside bodies by photoelasticimetry, in particular in scattered light

Publications (1)

Publication Number Publication Date
GB1091598A true GB1091598A (en) 1967-11-22

Family

ID=8816278

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4568164A Expired GB1091598A (en) 1963-11-12 1964-11-09 Processes and devices for measuring stresses within a transparent body for electromagnetic waves

Country Status (2)

Country Link
FR (1) FR1383071A (en)
GB (1) GB1091598A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153524A (en) * 1984-01-26 1985-08-21 Gen Electric Co Plc Sensing strain in transparent fibre

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1544836A (en) * 1967-09-28 1968-11-08 France Ministre Des Armees Device for measuring a form of light

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153524A (en) * 1984-01-26 1985-08-21 Gen Electric Co Plc Sensing strain in transparent fibre

Also Published As

Publication number Publication date
FR1383071A (en) 1964-12-24

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