Laser safety classification

by:LASERRPAIR     2020-06-05
?????It is well known in the industry that most of the additional radiation hazards of lasers and other related hazards can be prevented with certain equipment, such as protective glasses and measures. According to the degree of danger of laser light, the industry divides the laser safety level into four levels, and can take appropriate safety measures respectively, simplify the procedures of the safety measures, and play a substantial protective role. Class 1 laser: This class of laser, based on current medical knowledge, is considered safe. Under this condition, the eyes will not be exposed to optical radiation under any conditions. Or although it is a more harmful laser, but it is placed in the corresponding sealed product, no harmful radiation can escape the enclosure. For example: CD-ROM drive Class 2 laser: The second-level laser system refers to a low-power, visible laser. The beam of the second-level laser has long been harmful, that is, a low-risk laser. The second-level laser will cause eye damage only if you deliberately resist the natural aversion response and continue to stare. The secondary laser needs to post a 'warning' sign. Example: supermarket scanner Class 3 laser: Even if it is only for a short period of time before the photophobic reaction is completed, there will be damage if a third-level laser light enters the eye. The third level is divided into three (a) and three (b) sub-levels. Class 3 (a) laser systems also need to post 'Warning' signs and sometimes 'Danger' signs. If it is only seen for a short time, the repulsive reflection of light by the human eye will protect it. If you use a condensing device for observation, it may cause injury, such as when adjusting the optical device. Class III (b) laser systems may cause injury if they look directly or see the secondary beam. Generally, this series of lasers will not cause harm after being reflected by a matte surface. 'Danger' signs are generally posted on this series of systems. Although they are harmful to the eyes, they are less likely to cause fire or burn skin. It is recommended to wear eye protection when using this series of lasers. Example: Laser pointer Class 4 laser: Class 4 laser damages both eyes and skin, direct reflection, secondary reflection and diffuse reflection will cause damage. All Class 4 laser systems are marked with 'Danger'. Class 4 lasers can also damage materials in or near the laser area and ignite flammable substances. It is recommended to wear eye protection when using this series of lasers. If used improperly, so that the eyes and skin are exposed to direct or scattered light beams, it will damage the eyes and skin and cause a fire. For example: Near-infrared fiber laser used for marking and cutting welding bar.
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