GB2107069A - Optical fibre test grips - Google Patents
Optical fibre test grips Download PDFInfo
- Publication number
- GB2107069A GB2107069A GB08129394A GB8129394A GB2107069A GB 2107069 A GB2107069 A GB 2107069A GB 08129394 A GB08129394 A GB 08129394A GB 8129394 A GB8129394 A GB 8129394A GB 2107069 A GB2107069 A GB 2107069A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibre
- capstan
- grips
- optical
- groove
- 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 41
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000009864 tensile test Methods 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 claims description 2
- 238000006731 degradation reaction Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 238000009661 fatigue test Methods 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 239000011253 protective coating Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/386—Glass
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Each one of a pair of optical fibre test grips has a fixed elastomeric capstan 1 around which several turns of fibre are wrapped. The final turn is accommodated in a groove 4 and clamped in position by means of a clamping plate 7 which urges the side walls of the groove together. <IMAGE>
Description
SPECIFICATION
Optical fibre test grips
This invention relates to the design of test grips for performing tensile tests on lengths of on-line coated optical fibres.
For many applications of optical fibre an important parameter is the change of optical performance brought about by the imposition of tensile stress. In order to be able to make measurements of such changes it is necessary to grip the fibre in two spaced apart regions and apply tension over the intervening region. Clearly the gripping must be sufficiently tight to prevent slippage at the values of tension required to be investigated. Normally this gripping will involve applying lateral compressive forces to the fibre.
These forces are themselves liable to damage the optical performance of the fibre, and hence it is necessary to use test grips which can support without slippage a relatively large tensile force with a relatively low compressive force.
Since the strength of a freshly drawn glass optical fibre deteriorates relatively rapidily if its surface is left exposed to atmospheric attack, it is general practice to arrange for the fibre to be provided with a protective coating on-line with the fibre drawing operation. For some applications, it is desirable to use such an on-line coated fibre where it is subject to tension without first having received any other coating. For such applications it may be necessary to measure the tensile strength of the on-line coated fibre over a wide temperature range, typically20 C to +600C, for example.
According to the present invention there is provided a pair of tensile test grips for gripping a plastics coated optical fibre in two spaced apart regions for subjecting the intervening region of fibre to tensile stress, each of which test grips includes a non-rotating elastomeric cylindrical capstan provided, adjacent the edge of one of the capstan end faces, with a circumferential groove to a depth greater than a fibre diameter, wherein the capstan is provided with a substantially rigid capping plate and means for clamping said plate against said one end face to urge together the side walls of the groove so as to trap an optical fibre inserted therebetween.
A feature of this design is that it is relatively compact, and it is particularly useful when testing is required in special environments of controlled temperature and humidity within a confined space. The grips are useable over a wide temperature range of-600C to +1200C, without incurring degradation to capstans or to the on-line
coated fibre, and in addition obviating the slippage of fibre over such a large temperature range. Such grips are also suitable for conducting specialised static fatigue tests on on-line coated fibres.
There follows a description of one of a pair of test grips embodying the invention in a preferred form. The description refers to the accompanying drawing which depicts an exploded perspective view of one test grip.
Referring to the drawing, a substantially cylindrical natural rubber capstan 1 is rigidly attached to a metal bracket member 2 by means of a length of studding 3. This particular capstan is designed for performing tests on optical fibre having a diameter in the range 1 000 microns encased in a primary coating, and the capstan has a diameter of about 6 cm and a length between its end faces of about 4.5 cm.
The choice of a suitable diameter depends not only upon mechanical considerations but also upon optical ones. A typical silica optical fibre can be bent to a significantly tighter radius having regard to its mechanical properties, but in the case of low numerical aperture fibre a significantly tighter radius will be undesirable if it is tight enough to introduce radiative losses.
Typically with the 6 cm diameter capstan enough fibre is held in contact with the capstan by somewhere in the region of five whole turns of fibre wrapped around the smooth curved capstan surface, after which a final, nearly complete turn is accommodated in the fine groove 4 formed in the curved surface of the capstan near its outer end face 5.
Secured to this outer end face 5 by means of the studding 3 and the wing nut 6 is a metal capping disc 7 having the same diameter as the main portion of the capstan 1, and the groove 4 is preferablyshaped in cross-section and dimensioned so that the on-line coated fibre is pinched between the walls of the U. Typically the groove is about 0.1 mm wide, and about 1 to 2 mm in depth. The fibre is actually clamped by the action of the capping disc compressing the rubber end face, thereby pressing the two walls of the groove onto the fibre and holding the fibre in position.
Claims
1. A pair of tensile test grips for gripping a
plastics coated optical fibre in two spaced apart
regions for subjecting the intervening region of fibre to tensile stress, each of which test grips
includes a non-rotating elastomeric cylindrical
capstan provided, adjacent the edge of one of the
capstan end face, with a circumferential groove to
a depth greater than a fibre diameter, wherein the
capstan is provided with a substantially rigid
capping plate and means for clamping said plate
against said one end face to urge together the
side walls of the groove so as to trap an optical
fibre inserted therebetween.
2. A pair of tensile test grips substantially as
hereinbefore described with reference to the
accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
1. A pair of tensile test grips for gripping a
plastics coated optical fibre in two spaced apart
regions for subjecting the intervening region of fibre to tensile stress, each of which test grips
includes a non-rotating elastomeric cylindrical
capstan provided, adjacent the edge of one of the
capstan end face, with a circumferential groove to
a depth greater than a fibre diameter, wherein the
capstan is provided with a substantially rigid
capping plate and means for clamping said plate
against said one end face to urge together the
side walls of the groove so as to trap an optical
fibre inserted therebetween.
2. A pair of tensile test grips substantially as
hereinbefore described with reference to the
accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08129394A GB2107069B (en) | 1981-09-29 | 1981-09-29 | Optical fibre test grips |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08129394A GB2107069B (en) | 1981-09-29 | 1981-09-29 | Optical fibre test grips |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2107069A true GB2107069A (en) | 1983-04-20 |
GB2107069B GB2107069B (en) | 1985-05-01 |
Family
ID=10524813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08129394A Expired GB2107069B (en) | 1981-09-29 | 1981-09-29 | Optical fibre test grips |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2107069B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3636252A1 (en) * | 1986-10-24 | 1988-05-05 | Siegfried Heck | Divisible clamping head with an integrated strain-gauge force transducer for the clamping of tension samples |
DE4240919A1 (en) * | 1991-12-09 | 1993-06-17 | Instron Corp | |
CN118067268A (en) * | 2024-04-19 | 2024-05-24 | 湘江实验室 | Optical fiber temperature sensor and method for improving stability thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105203395A (en) * | 2015-09-22 | 2015-12-30 | 苏州维艾普新材料股份有限公司 | Method for rapidly detecting strength of glass wool and products of glass wool |
-
1981
- 1981-09-29 GB GB08129394A patent/GB2107069B/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3636252A1 (en) * | 1986-10-24 | 1988-05-05 | Siegfried Heck | Divisible clamping head with an integrated strain-gauge force transducer for the clamping of tension samples |
DE4240919A1 (en) * | 1991-12-09 | 1993-06-17 | Instron Corp | |
CN118067268A (en) * | 2024-04-19 | 2024-05-24 | 湘江实验室 | Optical fiber temperature sensor and method for improving stability thereof |
Also Published As
Publication number | Publication date |
---|---|
GB2107069B (en) | 1985-05-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |