BS EN 2155-3-1993 Specification for test methods for transparent materials for aircraft glazing - Determination of refractive index《飞机窗玻璃透明材料试验方法 折射率的测定》.pdf

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

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