BS EN 207:2017 pdf download.Personal eye-protection equipment – Filters and eye-protectors against laser radiation (laser eye-protectors).
BS EN 207 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 urn) to 1 000 lIm. 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 appbances.
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 lollowing documents, in whole or in part, are normatively reterenced 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 166:200 1, Personal eye-protection -Specifications
EN 167:200 1, Personal eye-protection -Optical test methods
EN 168:200 1, 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, Colorlmetiy – Part 1: CIE standard colorimetric observers ISO 11664-2:2007, Colorimetiy – Part 2: C1E 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 % maybe accepted provided that the manufacturer supplies information related to the increase of the intensity of ilumination at the relevant workplace in accordance with Clause 5.
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.
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.
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 167:200 1, 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 I 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 inS 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 diameterd is the area of the smallest circle containing 63 % of the laser power/energy.
For pulse durations c 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.BS EN 207 pdf download.