Personal eye-protection equipment - Filters and eye-protectors against laser radiation (laser eye-protectors)

This European Standard applies to eye-protectors used for protection against accidental exposure to laser radiation as defined in EN 60825-1:2007 in the spectral range 180 nm (0,18 µm) to 1 000 µm. It defines the requirements, test methods and marking. A guide is given in Annex B for the selection and use of laser eye protectors.
This European Standard does not apply to protectors for intentional exposure to laser radiation.
EN 208 applies for laser adjustment eye-protectors.
Before selecting eye protection according to this European Standard, a risk assessment should first be undertaken (see Annex B).

Persönlicher Augenschutz - Filter und Augenschutzgeräte gegen Laserstrahlung (Laserschutzbrillen)

Diese Europäische Norm gilt für Augenschutzgeräte, die zum Schutz gegen unbeabsichtigt einwirkende Laserstrahlung nach EN 60825 1:2007 im Spektralbereich zwischen 180 nm (0,18 µm) und 1000 µm Verwendung finden. Sie legt die Anforderungen, Prüfverfahren und die Kennzeichnung fest.
Einen Leitfaden für die Auswahl und die Anwendung von Laserschutzbrillen und Filtern in Geräten gibt der informative Anhang B.
Diese Europäische Norm gilt nicht für Schutzgeräte gegen absichtliche Laserstrahlenexposition.
Für Laser Justierbrillen gilt EN 208.
Bevor ein Augenschutz nach dieser Europäischen Norm ausgewählt wird, sollte zuerst eine Risiko¬analyse durchgeführt werden (siehe Anhang B).

Protection individuelle de l'oeil - Filtres et protecteurs de l'oeil contre les rayonnements laser (lunettes de protection laser)

La présente Norme européenne s'applique aux protecteurs de l'oeil utilisés contre l’exposition accidentelle aux rayonnements laser tels que définis dans l’EN 60825-1:2007 dans le domaine spectral compris entre 180 nm (0,18 μm) et 1 000 μm. Elle définit les exigences, les méthodes d'essai et le marquage.
Un guide de choix et d'utilisation des filtres et des lunettes de protection laser figure dans l'Annexe B informative.
La présente Norme européenne ne s’applique pas aux protecteurs destinés à une exposition volontaire aux rayonnements laser.
Les lunettes de réglage pour laser sont couvertes par l'EN 208.
Avant de choisir une protection de l'oeil conforme à la présente Norme européenne, il convient de réaliser au préalable une évaluation du risque (voir Annexe B).

Oprema za osebno varovanje oči - Filtri in varovala za zaščito oči pred laserskimi žarki (očala za zaščito pred laserskimi žarki)

Ta evropski standard se uporablja za varovala za oči, ki se uporabljajo za zaščito pred nenamerno izpostavljenostjo laserskim žarkom, kot je opredeljena v standardu EN 60825-1:2007, v spektralnem območju od 180 nm (0,18 µm) do 1000 µm. Standard določa zahteve, preskusne metode in označevanje. Dodatek B vsebuje vodilo za izbiro in uporabo očal za zaščito pred laserskimi žarki.
Ta evropski standard se ne uporablja za varovala za zaščito pred namerno izpostavljenostjo laserskim žarkom.
Standard EN 208 se uporablja za očala za prilagoditev laserskega sevanja.
Pred izbiro zaščite za oči na podlagi tega evropskega standarda je treba izvesti oceno tveganja (glej dodatek B).

General Information

Status
Published
Public Enquiry End Date
29-Jun-2016
Publication Date
18-Apr-2017
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
14-Mar-2017
Due Date
19-May-2017
Completion Date
19-Apr-2017

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Persönlicher Augenschutz - Filter und Augenschutzgeräte gegen Laserstrahlung (Laserschutzbrillen)Protection individuelle de l'oeil - Filtres et protecteurs de l'oeil contre les rayonnements laser (lunettes de protection laser)Personal eye-protection equipment - Filters and eye-protectors against laser radiation (laser eye-protectors)13.340.20Varovalna oprema za glavoHead protective equipmentICS:Ta slovenski standard je istoveten z:EN 207:2017SIST EN 207:2017en,fr,de01-maj-2017SIST EN 207:2017SLOVENSKI

STANDARDSIST EN 207:2010/AC:2012SIST EN 207:20101DGRPHãþD
SIST EN 207:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 207
March
t r s y ICS
s uä u v rä t r Supersedes EN
t r yã t r r {English Version

Personal eyeæprotection equipment æ Filters and eyeæProtection individuelle de l 5oeil æ Filtres et protecteurs

Persönlicher Augenschutz æ Filter und Augenschutzgeräte gegen Laserstrahlung This European Standard was approved by CEN on

z August
t r s xä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

t r yã t r s y ESIST EN 207:2017

EN 207:2017 (E) 2 Contents Page European foreword ....................................................................................................................................................... 5 1 Scope .................................................................................................................................................................... 6 2 Normative references .................................................................................................................................... 6 3 Requirements ................................................................................................................................................... 6 3.1 Spectral transmittance of filters and frames ........................................................................................ 6 3.2 Luminous transmittance of filters ............................................................................................................ 6 3.3 Resistance of filters and frames to laser radiation ............................................................................. 7 Table 1 — Scale numbers (maximum spectral transmittance and resistance to laser radiation) of the filters and/or eye-protectors against laser radiations .................................... 7 3.4 Refractive values of filters and eye-protectors .................................................................................... 7 Table 2 — Maximum refractive values of filters and eye-protectors with no corrective effect ....... 8 3.5 Quality of material and surface of filters ................................................................................................ 8 3.5.1 Material and surface defects ....................................................................................................................... 8 3.5.2 Diffusion of light .............................................................................................................................................. 8 3.6 Stability of filters and eye-protectors to ultraviolet radiation and elevated temperature ...................................................................................................................................................... 8 3.6.1 Stability to ultraviolet radiation ................................................................................................................ 8 3.6.2 Stability at elevated temperature ............................................................................................................. 8 3.7 Resistance of filters and frames to ignition by contact with hot surfaces .................................. 9 3.8 Field of vision of eye-protectors ................................................................................................................ 9 3.9 Construction of filters and frames ............................................................................................................ 9 3.10 Mechanical strength of eye-protectors ................................................................................................... 9 3.10.1 Basic requirement .......................................................................................................................................... 9 3.10.2 Optional requirements .................................................................................................................................. 9 4 Testing ................................................................................................................................................................. 9 4.1 General ................................................................................................................................................................ 9 Table 3 —Test schedule for filters, frames and complete eye-protectors for protection against laser radiation ............................................................................................................................... 10 4.2 Spectral transmittance of filters and frames ..................................................................................... 11 4.3 Luminous transmittance of filters ......................................................................................................... 11 4.4 Resistance of filters and frames to laser radiation .......................................................................... 11 Table 4 — Duration of test for filters and eye-protectors against laser radiation ............................. 11 4.5 Refractive value of filters and eye-protectors ................................................................................... 12 4.6 Quality of material and surface of filters ............................................................................................. 12 4.6.1 Material and surface defects .................................................................................................................... 12 4.6.2 Diffusion of light ........................................................................................................................................... 12 4.7 Stability to UV radiation and stability to elevated temperature ................................................. 12 4.7.1 Stability to UV radiation ............................................................................................................................ 12 4.7.2 Stability to elevated temperature .......................................................................................................... 12 4.8 Resistance of filters and frames to ignition by contact with hot surfaces ............................... 12 4.9 Field of vision of eye-protectors ............................................................................................................. 12 Figure 1 — Example of test set-up for the measurement of field of vision ............................................ 13 SIST EN 207:2017

EN 207:2017 (E) 3 4.10 Determination of the protected range .................................................................................................. 13 4.11 Frames .............................................................................................................................................................. 14 4.12 Mechanical strength .................................................................................................................................... 14 5 Information supplied by the manufacturer ........................................................................................ 14 6 Marking ............................................................................................................................................................ 14 6.1 Eye-protectors ............................................................................................................................................... 14 6.2 Filters ................................................................................................................................................................ 16 Annex A (informative)

Principle .......................................................................................................................... 17 A.1 Limit values and time base ........................................................................................................................ 17 Table A.1 — Simplified maximum permissible irradiation values for the cornea .............................. 17 Figure A.1 — Comparison of the limit values specified in EU 2006/25/EC and the simplified values of EN 207 ............................................................................................................................................ 18 A.2 Beam areas ...................................................................................................................................................... 18 A.3 Angle dependence ........................................................................................................................................ 18 A.4 Example test report ..................................................................................................................................... 19 Table A.2 — Test report ............................................................................................................................................ 19 Annex B (informative)

Recommendations for the use of laser radiation eye-protectors ............... 21 B.1 General ............................................................................................................................................................. 21 B.2 Types of lasers ............................................................................................................................................... 21 Table B.1 — Recommended scale numbers for use of filters and eye-protectors against laser radiation .......................................................................................................................................................... 22 B.3 Determination of the scale numbers ..................................................................................................... 22 B.3.1 General ............................................................................................................................................................. 22 B.3.2 Continuous wave laser (D) ........................................................................................................................ 23 B.3.3 Pulsed lasers (I, R), pulse duration

109 s ........................................................................................ 23 B.3.3.1 General ............................................................................................................................................................. 23 B.3.3.2 Calculation for the pulsed mode ............................................................................................................. 23 Table B.2 — Periods of time Ti below which energies of single pulses have to be added and maximum pulse repetition frequencies vmax = 1/Ti for the application of formula (B.4) ................................................................................................................................................................... 24 B.3.3.3 Calculation for the average power ......................................................................................................... 24 B.3.4 Mode coupled lasers (M), pulse duration < 109 s ............................................................................ 24 B.3.4.1 General ............................................................................................................................................................. 24 B.3.4.2 Calculation for the pulsed mode ............................................................................................................. 24 B.3.4.2.1 Wavelength range 400 nm to 1 400 nm ....................................................................................... 24 B.3.4.2.2 Wavelength ranges < 400 nm and > 1 400 nm ........................................................................... 24 B.3.4.3 Calculation for the average power ......................................................................................................... 25 B.4 Time base......................................................................................................................................................... 25 B.5 Filters in appliances..................................................................................................................................... 25 SIST EN 207:2017

EN 207:2017 (E) 4 Annex C (informative)

Significant technical changes between this European Standard and the previous editions .................................................................................................................................. 26 Annex ZA (informative)

Relationship between this European Standard and the essential requirements of Directive 89/686/EEC aimed to be covered ..................................................... 27 Table ZA.1 — Correspondence between this European Standard and Directive 89/686/EEC ...... 27 Bibliography ................................................................................................................................................................. 28

SIST EN 207:2017

EN 207:2017 (E) 5 European foreword This document (EN 207:2017) has been prepared by Technical Committee 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 September 2017, and conflicting national standards shall be withdrawn at the latest by September 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 207:2009. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 89/686/EEC. For relationship with EU Directive 89/686/EEC, see informative Annex ZA, which is an integral part of this document. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 207:2017

EN 207:2017 (E) 6 1 Scope This European Standard applies to eye-protectors used for protection against accidental exposure to laser radiation as defined in EN 60825-1:2007 in the spectral range 180 nm (0,18 µm) to 1 000 µm. It defines the requirements, test methods and marking. A guide is given in the informative Annex B for the selection and use of laser eye-protectors and filters in appliances. This European Standard does not apply to protectors for intentional exposure to laser radiation. EN 208 applies for laser adjustment eye-protectors. Before selecting eye protection according to this European Standard, a risk assessment should first be undertaken (see Annex B). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, 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 test methods EN 60825-1:2007, Safety of laser products - Part 1: Equipment classification and requirements (IEC 60825-1:2007) 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 transmittance of filters and frames When tested according to 4.2, the maximum spectral transmittance at the wavelength(s) or in the wavelength range(s) of protection shall not exceed the values specified in Table 1 for the applicable scale number. 3.2 Luminous transmittance of filters When assessed in accordance with 4.3, the luminous transmittance of the filter relative to the D65 standard illuminant (see ISO 11664-2:2007) shall be at least 20 %. However, luminous transmittance lower than 20 % may be accepted provided that the manufacturer supplies information related to the increase of the intensity of illumination at the relevant workplace in accordance with Clause 5. SIST EN 207:2017

EN 207:2017 (E) 7 3.3 Resistance of filters and frames to laser radiation When tested according to 4.4, the filters and frames shall meet the requirements of 3.1 and shall not lose their protective effect under the influence of laser radiation of the power (E)/ energy density (H) as specified in Table 1 and shall not show any induced transmission (reversible bleaching). No splinters 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 1 — Scale numbers (maximum spectral transmittance and resistance to laser radiation) of the filters and/or eye-protectors against laser radiations

Maximum spectral transmittance at the laser wavelength Power (E) / energy density(H)

for testing the protective effect and resistance to laser radiation in the wavelength range 180 nm to 315 nm

> 315 nm to 1 400 nm

> 1 400 nm to 1 000 µm For test condition/pulse duration in seconds (s) Scale number D

· 3 × 104 I, R 10 «9 to 3 × 104 M < 10 «9 D > 5 × 10 «4 I, R
10 «9 to 5 × 10 «4 M < 10 «9 D > 0,1 I, R 10 «9 to 0,1 M < 10 «9
W/m2 HI, R J /m2 EM
W/m2 ED
W/m2 HI, R J/m2 HM J/m2 ED
W/m2 HI, R J/m2 EM

W/m2 LB1 10 «1 0,01 3 × 102 3 × 1011 102 0,05 1,5 × 10 «3 104 103 1012 LB2 10 «2 0,1 3 × 103 3 × 1012 103 0,5 1,5 × 10 «2 105 104 1013 LB3 10 «3 1 3 × 104 3 × 1013 104 5 0,15 106 105 1014 LB4 10 «4 10 3 × 105 3 × 1014 105 50 1,5 107 106 1015 LB5 10 «5 102 3 × 106 3 × 1015 106 5 × 102 15 108 107 1016 LB6 10 «6 103 3 × 107 3 × 1016 107 5 × 103 1,5 × 102 109 108 1017 LB7 10 «7 104 3 × 108 3 × 1017 108 5 × 104 1,5 × 103 1010 109 1018 LB8 10 «8 105 3 × 109 3 × 1018 109 5 × 105 1,5 × 104 1011 1010 1019 LB9 10 «9 106 3 × 1010 3 × 1019 1010 5 × 106 1,5 × 105 1012 1011 1020 LB10 10 «10 107 3 × 1011 3 × 1020 1011 5 × 107 1,5 × 106 1013 1012 1021 The symbols D, I, R and M relative to the test conditions are explained in Table 4. 3.4 Refractive values of filters and eye-protectors When assessed in accordance with 4.5, the maximum refractive values of filters and eye-protectors with no corrective effect shall be as given in Table 2. The maximum refractive values apply to the range specified in 7.1.2.1 of EN 166:2001. SIST EN 207:2017

EN 207:2017 (E) 8 Table 2 — 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 out cm/m base in cm/m cm/m ±0,09 0,09 0,75 0,25 0,25 3.5 Quality of material and surface of filters 3.5.1 Material and surface defects The material and surface defects of filters shall be assessed in accordance with 4.6.1. Except for a marginal area of 5 mm wide, filters shall be free from any material 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 filter, determined in accordance with 4.6.2, shall not be greater than =2cd/m*0,50lxl (1) 3.6 Stability of filters and eye-protectors to ultraviolet radiation and elevated temperature 3.6.1 Stability to ultraviolet radiation When exposed to ultraviolet radiation in accordance with 4.7.1, the properties 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 be

¶ 10 %: %10≤∆vvττ=(2)=The=spectral=transmittance=for=the=laser=wavelengths=shall,=however,=in=no=case=excee≤=the=maxim×m=spectral=transmittance=correspon≤ing=to=the=in≤icate≤=scale=n×mber.=3.6.2 Stability at elevated temperature After exposure to elevated temperature in accordance with 4.7.2, filters and eye-protectors shall satisfy the requirements of 3.1, 3.2, 3.4 and 3.5. The relative change in the luminous transmittance shall not exceed 5 %: %5≤∆vvττ=(3)=The=spectral=transmittance=for=the=laser=wavelength=shall,=however,=in=no=case=excee≤=the=maxim×m=spectral=transmittance=correspon≤ing=to=the=in≤icate≤=scale=n×mber.=SIST EN 207:2017

EN 207:2017 (E) 9 3.7 Resistance 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 directions for each eye when measured in accordance with 4.9 (see Figure 1). 3.9 Construction of filters and frames 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 individual filters, they shall be assembled in such a way that they cannot be interchanged. 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 lies inside the protected range as defined below. In this 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. The frame shall be designed so that no laser radiation can penetrate from the side. 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: ()()246550,0013121,31012uβαα−=−×−−×−=(4)=The=≤ownwar≤=limit=l of the protected range shall be: ()()24567010222,31022lβαα−−=−+×−+×−=(5)=Testing=shall=be=≤one=in=accor≤ance=with=4.10.==3.10 Mechanical strength of eye-protectors 3.10.1 Basic requirement Filters for protection against laser radiation shall satisfy the requirement for minimum robustness as specified in 7.1.4.1 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. 3.10.2 Optional requirements If the mechanical strength of filters and eye-protectors against laser radiation is required to satisfy more stringent requirements, the requirements specified in 7.1.4.2 or the requirements specified in 7.2.2 of EN 166:2001 shall be met. 4 Testing 4.1 General The testing schedule in Table 3 shall be applied to testing of filters, frames and complete eye-protectors. The sequence of testing 1 to 9 and 13 to 16 may be changed. At least 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. SIST EN 207:2017

EN 207:2017 (E) 10 Table 3 —Test schedule for filters, frames and complete eye-protectors for protection against laser radiation Order of testing Requirement According to clause Number of filters/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 and frames 3.9 + +
5 Frames 3.9 + +
6 Diffusion of light 3.5.2 + +
7 Luminous transmittance 3.2 + +
8 Refractive values 3.4 + +
9 Prismatic power difference 3.4 3 frames
10 Spectral transmittance at wavelength
3.1 + + 3 filters/frames per
and test condition 3 filters/frames per
and test condition
11 Stability 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 +
17 Spectral transmittance 3.1 + +
18 Mechanical strength 3.10
19 Resistance to laser radiation and spectral transmittance at wavelength
3.3
3 filters/frames per
and test condition 3 filters/frames per
and test condition
20 Ignition 3.7
3 filters/ frames

21 Optional requirements as given in EN 166:2001 according to applicable clause of EN 166:2001

depends on requirement/ test procedure Explanation of the symbols:

+ = Testing to be carried out on the indicated specimen; Empty field = No testing specified. SIST EN 207:2017

EN 207:2017 (E) 11 4.2 Spectral transmittance of filters and frames The spectral transmittance shall be determined for normal incidence. Filters with angular-dependent transmittance (such as interference layers) for the wavelength range from 400 nm to 1 400 nm shall be measured at angles of incidence between 0° and 30° with polarized radiation and an orientation of the polarization direction giving the highest value of the spectral transmittance. Filters with angular-dependent transmittance for other wavelengths shall be measured at angles of incidence between 0° and 90° with polarized radiation. In this case, the scale number results from the highest of the spectral transmittance values measured. Testing shall be done in accordance with EN 167:2001, Clause 6. 4.3 Luminous transmittance of filters The luminous transmittance shall be determined for normal incidence, relative to the D65 standard illuminant (see ISO 11664-1:2007 and ISO 11664-2:2007). The test shall be performed according to EN 167:2001, Clause 6. 4.4 Resistance of filters and frames to laser radiation The test shall be carried out with laser radiation of the specified wavelengths and the power and energy densities given in Table 1. The spectral transmittance shall be measured for each laser wavelength during the exposure to laser radiation. The values of energy density (H) in Table 1 for testing the resistance against laser radiation for pulsed lasers (I, R, M) shall be multiplied with the factor N-1/4, where N is the number of pulses in 5 s. The frame shall be exposed to radiation at the point of least thickness for each of the materials used (with the exception of headbands). The diameter d63 of the laser beam during this test shall be (1 ± 0,1) mm. The diameter d63 is the area of the smallest circle containing 63 % of the laser power/energy. For pulse durations < 1 ns, the diameter d63 of the laser beam during this test shall be

· 0,5 mm. In the case of rectangular beams, the dimensions specified apply to the shortest side of the rectangle. The duration of the test shall be taken from Table 4. Table 4 — Duration of test for filters and eye-protectors against laser radiation Test conditions for laser type Typical laser type Pulse duration s Minimum number of pulses D I R M Continuous wave laser Pulsed laser Q switch pulsed laser Mode-coupled pulse laser 5 > 10 «6 to 0,25 > 10 «9 to 10 «6 < 10 «9 1 50 50 50 NOTE The pulse duration for test conditions I and R do not follow consecutively. Neither are they a continuation of the duration for test condition D. The pulse durations indicated are characteristic values of typical lasers. It is recommended to use a laser with a pulse duration in this range. Testing shall be done at least for 5 s, but in the case of pulsed operation never with less than 50 pulses. SIST EN 207:2017

EN 207:2017 (E) 12 For pulsed lasers, testing shall be done with low repetition rates ( ¶ t w Hz). If it is not possible

...

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