1、BRITISH STANDARD AEROSPACE SERIES BS EN 2155-3:1993 Test methods for transparent materials for aircraft glazing Part 3: Determination of refractive index The European Standard EN2155-3:1993 has the status of a British Standard UDC 629.73.023.26:620.1:535.32BSEN2155-3:1993 This British Standard, havi
2、ng been prepared under the directionof the Aerospace Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes intoeffecton 15April1993 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference ACE/62 Draft for comment 91/7492
3、7 DC ISBN 0 580 22064 8 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belg
4、e de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standar
5、ds Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Swed
6、en Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN2155-3:1993 BSI 11-1999 i Contents Page Cooperating organizations Inside front cover National foreword
7、ii Foreword 2 Introduction 3 1 Scope and field of application 3 2 Purpose of the method 3 3 Definition 3 4 Apparatus and material 3 5 Specimens 3 6 Conditioning 3 7 Procedure 3 8 Test report 3 National annex NA (informative) Committees responsible Inside back coverBSEN2155-3:1993 ii BSI 11-1999 Nati
8、onal foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN2155-3:1991 Aerospace Series Test methods for transparent materials for aircraft glazing Part 3: Determination of refractive index, published
9、 by the European Committee for Standardization (CEN). EN 2155-3 was produced as a result of international discussion in which the UK took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their co
10、rrect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4, an inside back cover and a back cover. This standard has be
11、en updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2155-3 January 1993 UDC 629.73.023.26:620.1:535.32 Descriptors: Aircraft industry, glazing, transpare
12、nt plastics, glass, tests, determination, refractivity English version Aerospace series Test methods for transparent materials for aircraft glazing Part 3: Determination of refractive index Srie arospatiale Mthodes dessais pour matriaux transparents pour vitrages aronautiques Partie 3: Dtermination
13、de lindice de rfraction Luft- und Raumfahrt Prfverfahren fr transparente Werkstoffe zur Verglasung von Luftfahrzeugen Teil 3: Bestimmung des Brechungsindexes This European Standard was approved by CEN on1993-01-04. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipu
14、late the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard ex
15、ists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards b
16、odies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Se
17、cretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 2155-3:1993 EEN2155-3:1993 BSI 11-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accord
18、ance with the rules of this Association, this Standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by
19、publication of an identical text or by endorsement, at the latest by July1993, and conflicting national standards shall be withdrawn at the latest by July1993. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium,
20、Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN2155-3:1993 BSI 11-1999 3 Introduction The method described in this standard differs from ISO489, method A, in the testing conditions. 1 Scop
21、e and field of application This standard specifies the method used for the determination of the refractive index applicable for transparent materials used in aircraft glazing. 2 Purpose of the method This method is used for the control of purity and composition of materials. The refractive index sha
22、ll be considered when designing the parts. 3 Definition The refractive index nis the ratio of the velocity of light in a vacuum to that in the material measured at23 C for the sodium D line wavelength589,3 nanometres. 4 Apparatus and material 4.1 Abbe refractometer or any other refractometer that ca
23、n be shown to give the same results, the accuracy shall be0,001. 4.2 Source of white light. 4.3 Contacting liquid Saturated aqueous solution of zinc chloride made slightly acid. 5 Specimens The test specimen cut from the sample shall be of such a size as will fit on the face of the fixed half of the
24、 refractometer prisms. For the Abbe refractometer the dimensions are as follows: 6 mm wide, 12 mm long, 3 mm thick. For necessary accuracy the surface of the test specimen in contact with the prism shall be sufficiently flat and polished in order to obtain satisfactory contact between the test speci
25、men and the prism. This contact is indicated by the dividing line between the light and dark halves of the eyepiece field appearing sharp and straight. A second surface is prepared under the same conditions perpendicular to the first and on one end of the test specimen. These two surfaces shall inte
26、rsect along a sharp line without a bevelled or rounded edge. 6 Conditioning The specimen shall be preconditioned at(23 2) C,(50 5)% relative humidity for at least48h prior to testing. Before the determination, the apparatus shall reach the same conditions. The test is to be performed immediately aft
27、er conditioning. 7 Procedure The procedure for the Abbe refractometer is described herebelow. For other refractometers the procedure may be modified if necessary. The determination is carried out at (23 0,5) C. A small drop of the contacting liquid is placed on the polished surface of the test speci
28、men which is then placed in firm contact with the surface of the prism with the polished small edge of the specimen towards the source of light. The index arm of the refractometer is then adjusted until half of the eyepiece field is dark. The compensator (Amici prisms) drum is then adjusted until al
29、l colour is removed from the field, after which the index arm is adjusted by means of the vernier until the dividing line between the light and dark portions of the field coincides exactly with the point of intersection of the eyepiece cross hairs. The refractive index for the sodium D line is then
30、read on the instrument scale. 8 Test report The test report shall include the following information: reference to this standard. refractive index to the nearest significant figure warranted by the precision and repeatability of measurement (if the refractive index is expressed to more than three sig
31、nificant figures, the wavelength of light for which the measurement was made is also reported). position on the original sample from which the test specimen was cut. 23 D -4 blankBSEN2155-3:1993 BSI 11-1999 National annex NA (informative) Committees responsible The United Kingdom participation in th
32、e preparation of this European Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/62 upon which the following bodies were represented: British Plastics Federation Ministry of Defence Society of British Aerospace Companies LimitedBS EN 2155-3:1993 BS
33、I 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are up
34、dated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this Britis
35、hStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest e
36、ditions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that h
37、ave been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are als
38、o available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and
39、 other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Pa
40、tents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessa
41、ry details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
