1、ASD Technical Report Rapport Technique ASD ASD Fachbericht TR 4647 Edition 1 December 2008 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: Descripto
2、rs: ENGLISH VERSION Aerospace series Termination procedure for EN 4639 optical contact Srie arospatiale Procdure de cblage pour contact optique EN 4639 Luft- und Raumfahrt Montageanleitung, fr Kontakte nach EN 4639 This Technical Report was drawn up by the Electrical Domain of ASD-STAN. The reason w
3、hich led to the publication of the document as a Technical Report is explained in the foreword. Edition approved for publication 31 December 2008 Electrical Domain Copyright 2008 by ASD-STAN Copyright ASD-STAN Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permi
4、tted without license from IHS-,-,-Page 2 TR 4647:12-08 Contents Page Foreword2 1 EN 4639-10* contacts terminus assembly.3 2 Normative references 3 3 Safety summary .4 4 Termini contact procedure .4 4.1 EN-4639-101 termini contact procedure4 4.2 EN-4639-102 termini contact procedure.14 5 Fibre cleave
5、 . 24 6 Standard polish (multimode fibre) 25 6.1 General. 25 6.2 Coarse polishing (manual). 25 6.3 Fine polishing automatic . 26 7 Quality check. 26 7.1 Visual examination . 26 7.2 Interferometer control 29 8 Installation of the terminus into a multipin connector 29 Foreword The main task of ASD-STA
6、N Technical Committees is to prepare EN Standards, in exceptional circumstances however, the publication of Technical Report of one of the following types may be proposed: Type 1, the subject is still under technical development requiring wider exposure; Type 2, a Technical Committee has collected d
7、ata of a different kind from that which is normally published as a European Standard. The Electrical Domain decided to publish this document in the form of a Technical Report of type 2 in order to facilitate the updating of this document. Copyright ASD-STAN Provided by IHS under license with AECMA N
8、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 3 TR 4647:12-08 1 EN 4639-10* contacts terminus assembly This termination process defines the stages to reach the minimum qualification requirements for the EN 4639-101 terminus onto tight structure simplex fibre
9、optic cable and the EN 4639-102 terminus onto semi-loose structure simplex fibre optic cable using Epo-Tek 353ND epoxy adhesive in accordance with EN 4639-001. Other procedure could be applied if they conform to the minimum qualification requirements and with common agreement between manufacturers a
10、nd user. NOTE Two types of termini are described in the following termination processes. It is critical to use the proper termini with the correct type of fibre optic cable: EN 4641-100 cable (2 mm max. tight structure) must use the EN 4639-101 termini. EN 4641-102 cable (2 mm max. semi-loose struct
11、ure) must use the EN 4639-102 termini. CAUTION Training and qualification personnel terminating fibre optic contacts are mandatory. Throughout the termination process, cleanliness is critical to obtain a high optical quality contact. Make sure that the hands and work area are as clean as possible to
12、 minimise the intake of dirt into the contact parts. NOTE Verify that the epoxy adhesive shelf life has not expired. Do not use epoxy adhesive with an expiration date that has passed. 2 Normative references The following referenced documents are indispensable for the application of this document. Fo
13、r dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 4639-001, Aerospace series Connectors, optical, rectangular, modular, multicontact, 1,25 diameter ferrule, with removable alignment sleeve
14、holder Part 001: Technical specification. EN 4639-101, Aerospace series Connectors, optical, rectangular, modular, multicontact, 1,25 diameter ferrule, with removable alignment sleeve holder Part 101: Optical contact for cable EN 4641-100 Operating temperature between 65 C and 152 C Product standard
15、. EN 4639-102, Aerospace series Connectors, optical, rectangular, modular, multicontact, 1,25 diameter ferrule, with removable alignment sleeve holder Part 102: Optical contact for cable EN 4641-102 Operating temperature between 55 C and 100 C Product standard. EN 4641-100, Aerospace series Cables,
16、optical 125 m diameter cladding Part 100: Tight structure 62,5/125 m GI fibre 1,8 mm outside diameter Product standard. 1)EN 4641-102, Aerospace series Cables, optical 125 m diameter cladding Part 102: Semi-loose 62,5/125 m GI fibre nominal 1,8 mm outside diameter Product standard. 1) In preparation
17、 at the date of publication of this standard. Copyright ASD-STAN Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 4 TR 4647:12-08 3 Safety summary The following safety precautions shall be observed: a) Safety glasses sha
18、ll be worn at all times when handling bare fibres or dispensing epoxy adhesive. b) To reduce the chance of skin contamination wear suitable disposable gloves i.e. surgical latex gloves. c) Do not touch the ends of the fibre as they may puncture the skin. Wash the hands after handling bare fibre. d)
19、Avoid skin contact with epoxy adhesives. e) Never look directly into the end of a fibre, always look indirectly at the fibre end after verifying that the fibre is not emitting energy or use a microscope with integrated camera. 4 Termini contact procedure 4.1 EN-4639-101 termini contact procedure 4.1
20、.1 Cable and fibre preparation Step 1 Before termination, clean minimum of 10 cm of the outer jacket of cable end with a suitable cleaning solution (for example. Isopropyl Alcohol (IPA) impregnated wipes, or a lint free cloth dampened with the cleaning solution). Step 2 Install the cable marker slee
21、ve and supplied crimp sleeve over the simplex cable (single fibre cable). Ensure that the crimp sleeve is installed onto the cable rib side first. Slide the crimp sleeve back from the end of the simplex cable. See Figure 1. Key 1 Cable marker sleeve 2 Introduction direction 3 Simplex cable 4 Crimpin
22、g sleeve 5 Crimping sleeve ribs Figure 1 Installing crimp sleeve NOTE For items 3 to 6 refer to Figure 2 for dimensional information. Introduction direction3 4521 Copyright ASD-STAN Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IH
23、S-,-,-Page 5 TR 4647:12-08 Step 3 Remove the cable jackets back to 23,5 mm using the cable stripper and cut the aramid yarn using the strength member shears so that it is even with the cable jacket. NOTE The optimum way to remove the cable jackets is to ring cut the jacket with the cable stripper an
24、d pull the jacket off by hand. Pushing off the simplex cable jacket with a tightly held simplex cable stripper can lead to fibre breakage. Step 4 Remove the simplex cable jacket back to 3 mm from outer jacket using the cable stripper. This step will expose the aramid yarn to the appropriate length.
25、WARNING Wear safety glasses when removing the fibre buffer and coating to avoid possible eye injury. Step 5 Remove the fibre buffer and coatings back to 13 mm from the outer jacket using the buffer stripper. Remove the buffer and coating in small sections approximately 6 mm at a time. NOTE Normally,
26、 the buffer and coating are tightly adhered to one another and come off of the fibre at the same time. CAUTION The uncoated fibre is in its most vulnerable state. Take extreme care not to damage the fibre. Breakage of any one fibre from this point until the connector is completely assembled will req
27、uire repetition of this and the following steps in order to maintain approximately equal length of all the fibres in the cable. Step 6 Remove any residual coating material from the bare fibres with a wipe dampened with a quality optical cleaning solution. Wipe only once from the end of the buffer to
28、wards the end of the fibre. NOTE 1 Silicone coated fibres may require additional cleaning to ensure the all of the silicone has been removed to ensure proper adhesion within the contact ferrule. NOTE 2 Repeated wiping may weaken the bare fibre. Key 1 Cable outer jacket 2 Aramid yarn 3 125 m fibre 4
29、900 m buffer Figure 2 EN 4639-101 contact cable stripping dimensions 12(3 0,5) mm(26,5 1,5) mm 4 3 (13,5 0,5) mmCopyright ASD-STAN Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 6 TR 4647:12-08 4.1.2 Installation of th
30、e EN 4639-101 terminus onto the fibre This procedure describes the process for installing EN 4639-101 terminus onto optical fibre. Epoxy adhesive is used to secure the fibre in the terminus for mating purposes. The data described in this document have been validated with Epo-Tek 353ND only. The manu
31、facturers cure schedules should be closely followed for maximisation of the polymerisation process. Step 1 Pre-heat a suitable curing oven to the required temperature, monitor the temperature using a thermometer or integrated temperature gauge. Step 2 Prepare an approved epoxy adhesive, in accordanc
32、e with the manufacturers instructions. CAUTION NOTE When using a 2 components epoxy adhesive, slowly mix the two parts together to minimize the introduction of air bubbles until the epoxy adhesive is smooth and uniform. Air bubbles in the epoxy adhesive can lead to connector failure during temperatu
33、re extremes. WARNING Wear safety glasses while dispensing the epoxy to avoid possible eye injury. Follow the manufacturers recommendations. Step 3 Once the epoxy is mixed, pour into a crucible or any other container. Step 4 Make sure the volumeter counter on the resin injector is set to 2,6 l. If it
34、 is not correctly positioned, then turn the knob until it indicates 026 in the volumeter counter window. See Figure 3. Key 1 Resin injector body 2 Injector push button 3 Volumeter knob 4 Volumeter counter window Figure 3 Resin injector and volumeter counter knob 12 3 4 Copyright ASD-STAN Provided by
35、 IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 7 TR 4647:12-08 Step 5 Completely depress the injector push button and insert the new piston into the metal fitting of the injector mandrel until it locks into place. Release the inj
36、ector push button. See Figure 4. Key 1 Metal fitting 2 Resin injector mandrel 3 Injector button depressed 4 Piston Figure 4 Installing the piston into the resin injector mandrel 23 4 1 Copyright ASD-STAN Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted w
37、ithout license from IHS-,-,-Page 8 TR 4647:12-08 Step 6 Push the new capillary over the piston until it locks into position on the resin injector mandrel. See Figure 5. Key 1 Resin injector mandrel 2 Capillary Figure 5 Installing the capillary onto the resin injector mandrel 2 1 Copyright ASD-STAN P
38、rovided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 9 TR 4647:12-08 Step 7 Depress the injector push button and introduce the end of the capillary into the container holding the epoxy. Gently release the injector push button
39、 to pick up the epoxy until the piston is fully extended. See Figure 6. NOTE Avoid picking up any air bubbles. If air bubbles have been picked up, leave the capillary in the epoxy and push out half the amount of epoxy lifted. Then repeat step 7. Key 1 Injector button depressed 2 Capillary 3 Containe
40、r holding epoxy Figure 6 Picking up the epoxy into resin injector Step 8 Wipe the capillary and tip clean using a dry lint free wipe. Step 9 Inspect the terminus and verify that the ferule hole is free and clean of dirt. This can be accomplished by holding the front of the terminus up to a light and
41、 verifying that the light is visible from the rear of the terminus. If light cannot be seen through the terminus, push music wire through the terminus hole to clear it. Then blow dry air through the hole to remove any debris. 213 Copyright ASD-STAN Provided by IHS under license with AECMA Not for Re
42、saleNo reproduction or networking permitted without license from IHS-,-,-Page 10 TR 4647:12-08 Step 10 Position the end of the capillary over the end of the ceramic ferule of the terminus. See Figure 7. Key 1 Tip of capillary 2 Terminus ferrule Figure 7 Injecting the epoxy into the terminus ferule S
43、tep 11 Press the injector push button gently so that the epoxy is injected into the ferule hole. Inject all of the epoxy from the resin injector into the terminus. NOTE Ensure the capillary is firmly seated against the ceramic terminus end face prior to injecting the epoxy. Step 12 Keeping the injec
44、tor push button depressed, lift the capillary away from the terminus end face. Release the push button. NOTE Using a dry lint free cloth, wipe away any excess epoxy from the side of the ceramic ferule and from the ferule end face if the epoxy bead is excessive. Step 13 Install the terminus onto the
45、fibre by gently working the fibre trough the terminus until the buffer seats against the rear of the terminus. See Figure 8. NOTE The outer cable jacket should come up and touch the rear of the terminus and the aramid yarn should evenly surround the rear of the terminus. 1 2 Copyright ASD-STAN Provi
46、ded by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 11 TR 4647:12-08 Key 1 Terminus 2 The rear of the terminus will touch the outer cable jacket 3 Outer cable jacket Figure 8 Installing the terminus onto the fibre Step 14 Add a
47、drop of epoxy to the crimp area, located at the rear of the terminus. See Figure 9. Key 1 Add drop of epoxy here Figure 9 Adding a drop of epoxy to rear of terminus Step 15 Slide the crimp sleeve up to capture the aramid yarn around the rear of the terminus. See Figure 10. NOTE Verify that the arami
48、d yarn does not protrude excessively from under the crimp sleeve. Aramid yarn protrusion will cause the terminus to not seat properly in the finished connector. If excessive aramid yarn protrudes from under the crimp sleeve, trim it back using strength member shears. Key 1 Aramid yarn 2 Crimp sleeve Figure 10 Sliding up the crimp sleeve 2 13 1 12 Copyright ASD-STAN Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,
