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Tuesday 09 January, 2018 | RSS Feed

Analysis of the problem of the optical biological safety detecti

by Piper Alice

Lamps and lanterns are indispensable in human life, and it is very important to detect the effect of light radiation on human health. Not only is the ultraviolet radiation, visible light, infrared radiation has an impact on human health. This effect has a positive impact on human physiology, but also may exist on the human potential hazards. In 2002, CIE published in the year of the S 009/E:2002 CIE in accordance with the relevant provisions of the ICNIRP (International Non ionizing radiation protection committee), the provisions of the relevant guidelines, these guidelines are derived from the results of the most applicable experimental study. In 2006, IEC S CIE 009/E:2002 IEC62471:2006 safety Photobiological lamps of lamp and systems. Because of the great influence of IEC on the safety, the safety of the lamp is getting more and more attention. In the same year, it is also the same as the 20145-2006 GB/T.
Based on 62471:2006 IEC, this paper analyzes some details of the detection process, which is easy to ignore in the detection process. According to the standard, the radiation hazard of all kinds of lamps and lanterns are classified, and the main evaluation of the harm types is shown in table 1. Can be seen from table 1, want to evaluate the harm of a lamp, mainly from the skin and eyes of the ultraviolet radiation damage, the eyes of the near UV damage, blue light damage, the thermal damage of the retina, retinal heat, weak, visual stimulation, eyes, infrared radiation, etc..
In the near ultraviolet harm of skin and eye measurement photochemical UV damage to the eyes, because of the human's physiological characteristics, such as a series of reasons, especially in testing a direction long lamp (such as T5 stent) must pay attention to the aperture to limit the field of view. The field angle is not due to a larger than 1.4 rad, the field diaphragm should such a setting: test end face of the light source detector distance end distance, according to the detector in the direction normal to the plane angle 4 0 degree calculated the constraint length of the diaphragm.
Test distance requirements of the standard is relatively clear, for general lighting with light g s l, regardless of the harm of irradiance and radiance values and test distance are in the light produced 500 LX, but this distance shall not less than 200 mm; for special purpose lamps and lanterns, including pulse light, should be in the test distance 2 0 0 m given hazard value. For some lamps and lanterns can be used for general lighting can also be used for special lighting, but also on the 200 mm distance to give a hazard.
This is considered human use of lighting and Industrial Vintage Lighting UK needs of normal human physiological distance. But in this test, the test direction of the lamps have some experience, it is easy to consider the mechanical axis of the lamp, and the direction of photometric axis measurement, this is not comprehensive, determine the direction of a lamp, must be considered in many ways, the first brightness is the most need to consider, the maximum brightness is not equal to the maximum; second, the maximum is not equal to the lamp. Therefore, the choice of the test distance will initially be very easy, but in fact it is very difficult to determine the lamp at different distances between the different
Consider a point: lamp light distribution curve, the lamps and lanterns of relative spectral distribution, lamp luminous surface, in the measuring distance of maximum brightness or maximum illumination, under different testing distance field aperture effect of lamps and lanterns, light emitting surface light source distribution especially l e d light source. In the event of a large number of test experience, can only do a lot of basic tests to select a comprehensive selection of different directions and distances.
It is very important to determine the wavelength spacing and the influence of wavelength spacing and wavelength accuracy is very large, for example, the wavelength change of 300 nm, and the spectral weighting function change of 3 nm, the influence of the distance and wavelength accuracy of the test results is very large.
Generally speaking, the choice of measuring distance is such that the wavelength of 400 nm is the wavelength of 1 nm, and the wavelength of the wavelength is 400 nm, the wavelength spacing is 5 nm.
Normal eyes, when you look at an object, do a little irregular movement with the frequency of a few hertz. The fast movement of the eye causes a point light source to be scattered in a region of the retina, the size of the region is about 0.011 rad of the side angle. This is a difficult problem for the difference between the light radiation safety and the general photometric measurement. With the increase in the target fixation time, the fixation ability will decrease, which will lead to the radiation energy of the target in the retina is scattered in a larger area. And it is noted that only in the wavelength of 380 nm to 1400 nm between the radiation, in order to penetrate the normal eyes of the media






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