1、BS EN 208:2009ICS 13.340.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPersonal eye-protection Eye-protectors foradjustment workon lasers and lasersystems (laseradjustment eye-protectors)This British Standardwas published under theauthority of the StandardsP
2、olicy and StrategyCommittee on 31 March2010 BSI 2010ISBN 978 0 580 59669 8Amendments/corrigenda issued since publicationDate CommentsBS EN 208:2009National forewordThis British Standard is the UK implementation of EN 208:2009. Itsupersedes BS EN 208:1999 which is withdrawn.The UK participation in it
3、s preparation was entrusted to TechnicalCommittee PH/2, Eye protection.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct applic
4、ation.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 208:2009EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 208 December 2009 ICS 13.340.20 Supersedes EN 208:1998English Version Personal eye-protection - Eye-protectors for adjustment work on lasers and la
5、ser systems (laser adjustment eye-protectors) Protection individuelle de lil - Lunettes de protection pour les travaux de rglage sur les lasers et sur les systmes laser (lunettes de rglage laser) Persnlicher Augenschutz - Augenschutzgerte fr Justierarbeiten an Lasern und Laseraufbauten (Laser-Justie
6、rbrillen) This European Standard was approved by CEN on 21 November 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliogr
7、aphical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of
8、a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irelan
9、d, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17,
10、 B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 208:2009: EBS EN 208:2009EN 208:2009 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Requirements .43.1 Spectral transmittance of filters and fr
11、ames 43.2 Luminous transmittance of filters 53.3 Resistance of filters and frames to laser radiation 53.4 Refractive values of filters and eye-protectors 63.5 Quality of material and surface of filters .63.6 Stability of filters and eye-protectors to ultraviolet radiation and to elevated temperature
12、 63.7 Resistance of filters and frames to ignition by contact with hot surfaces 73.8 Field of vision of eye-protectors 73.9 Construction of filters .73.10 Construction of frames .73.11 Mechanical strength of eye-protectors74 Testing 84.1 General 84.2 Spectral transmittance of filters and frames 94.3
13、 Luminous transmittance of filters 94.4 Resistance of filters and frames to laser radiation 94.5 Refractive value of filters and eye-protectors 94.6 Quality of material and surface of filters 104.7 Stability to UV radiation and stability to elevated temperature . 104.8 Resistance of filters and fram
14、es to ignition by contact with hot surfaces . 104.9 Field of vision of eye-protectors . 104.10 Determination of the protected range. 104.11 Frames . 104.12 Mechanical strength . 105 Information supplied by the manufacturer 116 Marking 11Annex A (informative) Principle 14A.1 Class 2 lasers 14A.2 Beam
15、 reduction and time base 14A.3 Resistance to laser radiation . 14A.4 Example test report 16Annex B (informative) Recommended use of laser adjustment eye-protectors 18B.1 General . 18B.2 Continuous wave lasers . 18B.3 Pulsed lasers . 19Annex C (informative) Significant technical changes between this
16、European Standard and the previous edition 21Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 89/686/EEC . 22Bibliography . 23BS EN 208:2009EN 208:2009 (E) 3 Foreword This document (EN 208:2009) has been prepared by Technical Committee
17、 CEN/TC 85 “Eye protective equipment”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2010, and conflicting national standards shall be withdrawn a
18、t the latest by June 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 208:1998. This document has bee
19、n prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. The significant technical c
20、hanges between this European Standard and the previous edition are detailed in Annex C. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic
21、, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 208:2009EN 208:2009 (E) 4 1 Scope This European S
22、tandard applies to laser adjustment filters and eye-protectors. These are filters and eye-protectors for use in adjustment work on lasers and laser systems as defined in EN 60825-1:2007 where hazardous radiation occurs in the visible spectral range of 400 nm to 700 nm. Filters specified in this Euro
23、pean Standard reduce this radiation to values defined for lasers of class 2 ( 1 mW for CW (continuous wave) lasers). This European Standard defines the requirements, test methods and marking. A guide is given in Annex B with regard to selection and use. EN 207 applies to eye-protection against accid
24、ental exposure to laser radiation. NOTE Before selecting eye protection according to this European Standard a risk assessment should first be undertaken (see Annex B). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated referenc
25、es, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 166:2001, Personal eye-protection Specifications EN 167:2001, Personal eye-protection Optical test methods EN 168:2001, Personal eye-protection Non-optical
26、 test methods EN 207:2009, Personal eye-protection equipment Filters and eye-protectors against laser radiation (laser eye-protectors) ISO 11664-1:2007, Colorimetry Part 1: CIE standard colorimetric observers ISO 11664-2:2007, Colorimetry Part 2: CIE standard illuminants 3 Requirements 3.1 Spectral
27、transmittance of filters and frames When tested according to 4.2, the spectral transmittance values of the filters and the frames for the laser wavelength shall be as given in Table 1. BS EN 208:2009EN 208:2009 (E) 5 Table 1 Scale numbers, spectral transmittance and maximum laser power Scale number
28、Spectral transmittance CW and pulse lasers with a pulse duration of 2 10-4s Maximum laser power W Pulse lasers with a pulse duration of 10-9s to 2 10-4s Maximum pulse energy J Filter FrameRB 1 10-20,1 s-1). The eye-protector shall not show any induced transmission (reversible bleaching). No splinter
29、s shall come away from the side of the filter facing the eye under the influence of the laser radiation. Any melting or other damage of the surface during the course of irradiation is not considered negative if the protective effect is still maintained. Table 2 Power density and energy density for t
30、esting Scale number Power density E W/m2 Energy density H J/m2 RB 1 1 1042 RB 2 1 10520 RB 3 1 106200 RB 4 1 1072 000 RB 5 1 10820 000 BS EN 208:2009EN 208:2009 (E) 6 3.4 Refractive values of filters and eye-protectors When tested in accordance with 4.5, the maximum refractive values of filters and
31、eye-protectors with no corrective effect shall be as given in Table 3. They apply for the range specified in EN 166. Table 3 Maximum refractive values of filters and eye-protectors with no corrective effect Spherical power m-1 Astigmatic power m-1 Prismatic power difference horizontal vertical base
32、out cm/m base in cm/m cm/m 0,09 0,09 0,75 0,25 0,253.5 Quality of material and surface of filters 3.5.1 Material and surface defects The material and surface defects of filters shall be tested in accordance with 4.6.1. Except for a marginal area of 5 mm wide, filters shall be free from any material
33、or surface defects likely to impair the intended use, such as bubbles, scratches, inclusions, dull spots, mould marks, scoring or other defects originating from the manufacturing process. No holes are allowed anywhere in the filters. 3.5.2 Diffusion of light The reduced luminous coefficient l* of a
34、filter, determined in accordance with 4.6.2, shall not be greater than lxm/cd50,0*2=l (1) 3.6 Stability of filters and eye-protectors to ultraviolet radiation and to elevated temperature 3.6.1 Stability to ultraviolet radiation When exposed to ultraviolet radiation in accordance with 4.7.1, the prop
35、erties of filters and eye-protectors shall not change to such an extent that they can no longer satisfy the requirements of 3.1, 3.2, 3.4 and 3.5. The relative change in the luminous transmittance shall not exceed 10 %. %10vv(2) The spectral transmittance for the laser wavelengths shall, however, in
36、 no case exceed the maximum spectral transmittance corresponding to the indicated scale number (see Table 1). 3.6.2 Stability to elevated temperature After exposure to elevated temperature in accordance to 4.7.2, filters and eye-protectors shall satisfy the requirements of 3.1, 3.2, 3.4 and 3.5. The
37、 relative change in the luminous transmittance shall not exceed 5 %. %5vv(3) BS EN 208:2009EN 208:2009 (E) 7 The spectral transmittance for the laser wavelengths shall, however, in no case exceed the maximum spectral transmittance corresponding to the indicated scale number (see Table 1). 3.7 Resist
38、ance of filters and frames to ignition by contact with hot surfaces When tested in accordance with 4.8, the filters and frames shall not ignite or continue to glow. 3.8 Field of vision of eye-protectors Eye-protectors shall have a clear field of vision of at least 40 in the vertical and horizontal d
39、irections for each eye when measured in accordance with 4.9. 3.9 Construction of filters Filters shall be constructed so that when tested in accordance with 4.4 followed by a visual inspection no splinters are detached from the side of the filter facing the eye. If the filters consist of several ind
40、ividual filters, they shall be assembled in such a way that they cannot be interchanged. 3.10 Construction of frames 3.10.1 Filters shall not be interchangeable in the frame. An exception is possible if the protection to laser radiation is determined only by the filter(s) and no part of the frame li
41、es inside the protected range as defined below. In such a case the marking of the eye-protector shall be on the filter(s) and there is no requirement for the frame to satisfy 3.3 on resistance to laser radiation. 3.10.2 The frame shall be designed so that no laser radiation can penetrate from the si
42、de. This requirement is met if for the horizontal angle range from - 50 (nasal side) to + 90 (temporal side) the vertical angle range is protected within the following limit angles in degrees (). The upward limit u of the protected range shall be: () ()46212103,1123001,055 =u(4) The downward limit l
43、of the protected range shall be: () ()462522103,2121070 +=l(5) Testing shall be done in accordance with 4.10. 3.11 Mechanical strength of eye-protectors 3.11.1 Basic requirement Filters for protection against laser radiation shall satisfy the requirement for minimum robustness as specified in 7.1.4.
44、1 of EN 166:2001. The frames of the eye-protectors shall satisfy the requirements of 7.1.4.2 or 7.2.2 of EN 166:2001. 3.11.2 Optional requirement If the mechanical strength of filters and eye-protectors against laser radiation is to satisfy more stringent requirements, the requirements specified in
45、7.1.4.2 and 7.2.2 of EN 166:2001 shall be met. BS EN 208:2009EN 208:2009 (E) 8 4 Testing 4.1 General The testing schedule in Table 4 shall be applied to testing of filters, frames and complete eye-protectors for laser adjustment work. The sequences of testing 1 to 9 and 13 to 16 may be changed. At l
46、east 16 filters or eight complete eye-protectors are required for testing. If testing for several wavelengths (wavelength ranges) or testing conditions according to 4.4 and/or several optional requirements has to be done, more than 16 samples may be necessary. Table 4 Test schedule for filters, fram
47、es and complete eye-protectors for laser adjustment work Order of testing Requirements According to Clause Number of filter/frame samples 3 3 10 Depends on specification/requirement 1 Marking 6 + + 2 Material and surface defects 3.5.1 + + 3 Field of vision 3.8 1 frame 4 Construction of filters 3.9 +
48、 + 5 Construction of frames 3.10 + + 6 Diffusion of light 3.5.2 + + 7 Luminous transmittance 3.2 + + 8 Refractive values 3.4 + + 9 Prismatic power difference 3.4 + + 10 Spectral transmittance at wavelength 3.1 + + 3 filters/ frames per and test condition 3 filters/ frames per and test condition 11 S
49、tability to UV radiation 3.6.1 + 12 Stability to elevated temperature 3.6.2 + 13 Material and surface defects 3.5.1 + + 14 Diffusion of light 3.5.2 + + 15 Luminous transmittance 3.2 + + 16 Refractive values 3.4 + BS EN 208:2009EN 208:2009 (E) 9 Table 4 (continued) Order of testing Requirements According to Clause Number of fi
