Bsi bs en 02155 7 1997

BRITISH STANDARD AEROSPACE SERIES BS EN 2155 7 1997 Test methods for transparent materials for aircraft glazing — Part 7 Determination of optical deviation The European Standard EN 2155 7 1997 has the[.]

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ICS 4 0 5.9 ; 4 0 5

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Sum mary of pag es

This document comprises a font cov er, an inside f ont cov er, p g esi andi,

theEN title p g e, p g es2 and3 and a b ck cov er

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Am endm ents is ued sinc publ cation

Pag e

NORME EUROPÉENNE

July 19 7

ICS 4 0 0.1 ; 8 0 0.3 ; 8 1 0

Des riptor : Air raft in ustry, glazing, materials,transp rency, tests, determination,o tical pro erties, ang les:g ometry

Eng lish ver ion

Série aérosp tiale — Méthodes d’es ais pour

matériaux transparents pour vitrag es

aéronautiques — Partie 7: Détermination de

ladév iation optique

Luft- und Raumfahrt — Prüfver ahren für

transp rente W erkstofe zur Verg lasung von

Luftfahr eug en — Tei 7: Bestimmung der

optis hen Ablenkung

This European Stand rd was a prov ed b CEN on 19 7-0 -27 CEN member

are bou d to comply with the CEN/ CENELEC Internal Reg ulations which

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German) A v er ion in any other lang uag e ma e b translation u der the

responsibi ity of a CEN member into its own lang uag e and notified to the

Central Sec etariat has the same status as the oficial v er ions

CEN member are the national stand rds bodies of Austria, Belg ium,

Cz chRepublc, Denmark, Finland, France, Germany , Gre ce, I eland,

I eland, Italy , Luxembourg , Netherlands, Norway , Portug al, Sp in, Sweden,

Switz rland and United King dom

European Commit e for Stand rdization

Comité Europé n de Normalsation

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Central Se retariat: rue de Stas art 3 , B- 10 0 Brus els

© 19 7 CEN — All rig hts of ex ploitation in any form and b any means reserv ed worldwide for CEN

national Member

Ref No EN 2 5 -7:19 7 E

This European Stand rd has be n prep red b the

European Association of Aerosp ce Man facturer

( AECMA)

After inquiries and v otes car ied out in ac ord nce

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Cz chRepublc, Denmark, Finland, France,

Germany , Gre ce, I eland, I eland, Italy ,

Luxembourg , Netherlands, Norway , Portug al,

Sp in, Sweden, Switz rland and the

UnitedKing dom

Contents

Pag e

1 Scope

This stand rd specifies the method used for the

determination of optical dev iation caused to a beam

of l g ht p s ing throug h a transp rent element

material perpendicular to the optical a is of the

sy stem

2 Definition

For the purposes of this stand rd, the folowing

definition a pl es:

Optical dev iation is defined as the ang ular dev iation

of a beam of lg ht emerging fom a transp rent

material comp red with the direction of the incident

beam

3.1Optical sy stem of point l g ht sour e, c os -wires,

focusing lens, specimen holder and a s re n

3.2 Upon the s re n are traced concentric cir les of

specified ra i such that they cor espond to ang les of

dev iation of 1,5; 3,0; 6,0 and 10,0 min tes of ar

relativ e to the distance betwe n specimen and

s re n

The ra ius r of each cir le is g iv en b the formula:

r = 0,291 d.D

where:

The Ta le 1 shows v alues of r cor esponding to d

ex res ed in min tes of ar and ra ians for two

v alues of D

Ta le 1

4 Specim ens

The specimens are the elements themselv es

5 Procedure

5.1 The specimens shal be tested after careful

remov al of surace dust b wiping with a l nt-fe

cloth

5.2 The optical sy stem is set up so that the imag e of

the c os -wires is focused onto the s re n and

coincides with the centre of the concentric cir les

The test specimen is interposed betwe n the

c os -wires and the s re n at distance D f om the

s re n

5.3 The dev iation is display ed as the mov ement of

the imag e f om the centre of the concentric cir les to

one of the z nes defined b the concentric cir les

specified in 3.2

5.4 The specimens shal be s an ed at interv als

of10 mm in mutual y perpendicular directions

( unles otherwise specified)

6 Expres ion ofresults

The v alues of the dev iation shal be recorded and

g ra hical y represented in order to esta lsh the

relation betwe n their position and their direction

on the test specimen

7 Test report

The test report shal include the folowing

information

— n mber of this stand rd;

— des ription of the sampl ng method;

— n mber of test specimens used;

— dimensions of the test specimens used;

— indiv idual v alues of the optical dev iation and

their presentation in a diag ram ac ording to 6;

— observ ations on any cir umstances la le to

influence the results

r is the ra ius of cir le, in mi imetres;

d is the dev iation, in min tes of ar ;

D is the distance betwe n specimen and

s re n, in metres

Min tes of ar Ra ians D = 5 m D = 8 m

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