BS EN 207:2009 pdf download – Personal eye- protection equipment — Filters and eye- protectors against laser radiation (laser eye-protectors) 4.2Spectral transmittance of filters and frames The spectral transmittance shall be determined for normal incidence. Filters with angular-dependenttransmittance (such as interference layers) for the wavelength range from 400 nm to 1 400 nm shall bemeasured at angles of incidence between 0° and 30° with polarized radiation and an orientation of thepolarization direction giving the highest value of the spectral transmittance. Filters with angular-dependenttransmittance for other wavelengths shall be measured at angles of incidence between 0° and 9o° withpolarized radiation. In this case, the scale number results from the highest of the spectral transmittance valuesmeasured. Testing shall be done in accordance with EN 167:2001,Clause 6. 4.3Luminous transmittance of filters The luminous transmittance shall be determined for normal incidence, relative to the D65 standard illuminant(see lSO 11664-1:2007 and lsO 11664-2:2007). The test shall be performed according to EN 167:2001,Clause 6. 4.4Resistance of filters and frames to laser radiation The test shall be carried out with laser radiation of the specified wavelengths and the power and energydensities given in Table 1.The spectral transmittance shall be measured for each laser wavelength during theexposure 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 N1, 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 theexception of headbands). The diameter d6 of the laser beam during this test shall be (1 ±0,1) mm. For pulse durations < 1 ns, the diameter dg of the laser beam during this test shall be ≥ 0,5 mm.ln 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. For pulsed lasers, testing shall be done with low repetition rates(≤25 Hz). f it is not possible, the energydensity used for testing shall be given and the product shall be marked in accordance with 6.1, d). All laser protective filters and frames shall be tested in accordance with the test condition D. lf commerciallyavailable, testing at mode D shall be done with a real CW laser. If it is not feasible, testing shall be done with apulsed...
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