GB1018002A - Improved process and apparatus for examining and/or measuring stresses in glass and other transparent materials - Google Patents
Improved process and apparatus for examining and/or measuring stresses in glass and other transparent materialsInfo
- Publication number
- GB1018002A GB1018002A GB3586162A GB3586162A GB1018002A GB 1018002 A GB1018002 A GB 1018002A GB 3586162 A GB3586162 A GB 3586162A GB 3586162 A GB3586162 A GB 3586162A GB 1018002 A GB1018002 A GB 1018002A
- Authority
- GB
- United Kingdom
- Prior art keywords
- specimen
- light
- stresses
- curve
- path
- 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
Links
- 239000011521 glass Substances 0.000 title abstract 3
- 238000000034 method Methods 0.000 title abstract 2
- 239000012780 transparent material Substances 0.000 title 1
- 230000007935 neutral effect Effects 0.000 abstract 5
- 239000010453 quartz Substances 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000009792 diffusion process Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 abstract 1
- 229910052753 mercury Inorganic materials 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
Classifications
-
- 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
-
- 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
- G01N21/21—Polarisation-affecting properties
Abstract
1,018,002. Photo-elastic stress indicators; testing photo-electrically. COMPAGNIE DE SAINT-GOBAIN. Sept. 20, 1962 [Sept. 20, 1961], No. 35861/62. Headings G1A and G1W. [Also in Division G2] A process for examining and/or measuring the stresses in a glass or other transparent specimen A, comprises passing a beam of light through the specimen and examining and/or measuring the interference fringes produced by diffusion of the beam along its path through the specimen either through a polarising analyser, if the incident beam is unpolarised, or directly if the incident beam is polarised. In the apparatus shown a beam of light from a mercury lamp 1 is passed through a condenser 2 and converging lens system 3, the focal point B of which is preferably at the centre of the specimen A. The light from the lens system 3 passes through a yellow filter 4, to increase the contrast of the observed image, through an adjustable polariser 5 and to the specimen A through a prism 6 which the light enters orthogonally Fig. 2, not shown. Light diffused at right angles from the beam in the specimen A is observed through a prism 7 and passes to a converging lens system 9 which forms a real image of the path of the light beam in the specimen at a slit 10. The prisms 6 and 7 are cemented to the specimen A optical contact being ensured by use of an index liquid. An adjustable analyser 11 is also provided in the path of the diffused light. The image of the slip 10 is viewed through slots 14 (Fig. 3, not shown) in a wheel 13, the slots scanning the slit 10 as the wheel rotates, and a photomultiplier may be used to produce electrical signals in response to the variations in light intensity of the image when scanned by the slots 14, the signals being displayed on an oscilloscope (not shown). If the glass specimen has a parabolic stress distribution with stresses parallel to opposite faces of the specimen as compressive stresses at the faces decreasing to neutral lines, and with the central region of the specimen under tensile stress then the path difference introduced by these stresses between the components of a polarised light beam varies as shown in (Fig. 5, not shown) rising to a maximum at the first neutral line, and falling to a minimum at the second neutral line, then interference fringes will be produced at all points where the curve C cuts axes, parallel to the abscissae axis, for phase differences of whole numbers of wave lengths. If a supplementary delay e.g. a movable quartz wedge or rotatable quarter-wave plate is introduced into the system the curve C will be shifted e.g. to the position of the curve C<SP>1</SP> and the interference fringes can be made to oscillate about two fixed points which will correspond to the neutral lines. The stresses in the layer of the specimen between the neutral lines can be found by counting the fringes between the corresponding points on the oscilloscope display. The curve of Fig. 5 may be materialised by using a quartz wedge in the primary beam instead of observing the diffused light, and depending on the angles involved between the light rays and the specimen the polariser or analyser may be dispensed with. Instead of focusing the light on the point B, a parallel beam of light may be used if desired.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR873745A FR1308015A (en) | 1961-09-20 | 1961-09-20 | Method and devices for the examination of stresses in parts made of transparent material, for example glass |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1018002A true GB1018002A (en) | 1966-01-26 |
Family
ID=8763195
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3586162A Expired GB1018002A (en) | 1961-09-20 | 1963-09-20 | Improved process and apparatus for examining and/or measuring stresses in glass and other transparent materials |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1473380B2 (en) |
FR (1) | FR1308015A (en) |
GB (1) | GB1018002A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3589812A (en) * | 1968-08-29 | 1971-06-29 | France Armed Forces | Processes and devices for measuring stresses within a transparent body for electromagnetic waves |
EP0104151A2 (en) * | 1982-09-21 | 1984-03-28 | SOCIETA ITALIANA VETRO - SIV SpA | A device for the non-destructive testing of the internal stress state of heat tempered plate glass |
CN106441655A (en) * | 2016-09-18 | 2017-02-22 | 北京杰福科技有限公司 | Glass surface stress detecting device |
CN108291852A (en) * | 2015-11-18 | 2018-07-17 | 康宁股份有限公司 | Device and method for determining the stress in handheld apparatus cover-plate glass |
CN111721712A (en) * | 2019-03-22 | 2020-09-29 | 康宁股份有限公司 | Hybrid system and method for characterizing stress in chemically strengthened transparent substrates |
CN115385561A (en) * | 2022-10-13 | 2022-11-25 | 中国洛阳浮法玻璃集团有限责任公司 | Method for rapidly solving plate explosion problem in float glass production based on stress |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4353649A (en) * | 1979-07-06 | 1982-10-12 | Tokyo Shibaura Denki Kabushiki Kaisha | Apparatus for surface stress measurement of glass coating and transparent plastic product |
IT1175776B (en) * | 1984-02-13 | 1987-07-15 | Siv Soc Italiana Vetro | EQUIPMENT FOR AUTOMATIC MEASUREMENT OF VOLTAGES IN A TRANSPARENT BODY BY DIFFUSED LIGHT |
DE19720330C1 (en) * | 1997-05-15 | 1998-11-12 | Sekurit Saint Gobain Deutsch | Method and device for measuring stresses in glass panes using the scattered light method |
-
1961
- 1961-09-20 FR FR873745A patent/FR1308015A/en not_active Expired
-
1962
- 1962-09-20 DE DE19621473380 patent/DE1473380B2/en active Pending
-
1963
- 1963-09-20 GB GB3586162A patent/GB1018002A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3589812A (en) * | 1968-08-29 | 1971-06-29 | France Armed Forces | Processes and devices for measuring stresses within a transparent body for electromagnetic waves |
EP0104151A2 (en) * | 1982-09-21 | 1984-03-28 | SOCIETA ITALIANA VETRO - SIV SpA | A device for the non-destructive testing of the internal stress state of heat tempered plate glass |
EP0104151A3 (en) * | 1982-09-21 | 1984-10-03 | Societa Italiana Vetro - Siv Spa | A device for the non-destructive testing of the internal stress state of heat tempered plate glass |
US4584476A (en) * | 1982-09-21 | 1986-04-22 | Societa Italiana Vetro Siv S.P.A. | Device for the non-destructive testing of the internal stress state of heat tempered plate glass |
CN108291852A (en) * | 2015-11-18 | 2018-07-17 | 康宁股份有限公司 | Device and method for determining the stress in handheld apparatus cover-plate glass |
CN106441655A (en) * | 2016-09-18 | 2017-02-22 | 北京杰福科技有限公司 | Glass surface stress detecting device |
CN111721712A (en) * | 2019-03-22 | 2020-09-29 | 康宁股份有限公司 | Hybrid system and method for characterizing stress in chemically strengthened transparent substrates |
CN115385561A (en) * | 2022-10-13 | 2022-11-25 | 中国洛阳浮法玻璃集团有限责任公司 | Method for rapidly solving plate explosion problem in float glass production based on stress |
CN115385561B (en) * | 2022-10-13 | 2023-11-21 | 中国洛阳浮法玻璃集团有限责任公司 | Method for rapidly solving problem of plate frying in float glass production based on stress |
Also Published As
Publication number | Publication date |
---|---|
FR1308015A (en) | 1962-11-03 |
DE1473380B2 (en) | 1970-06-25 |
DE1473380A1 (en) | 1968-11-21 |
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