Why the laser is dangerous?
If you have to use laser, you must pay attention to laser protection! First of all, we need to understand the laser hazard level. Class I low output laser (power less than 0.4mW) will not exceed the MPE value for the eyes and skin under any conditions, and will not exceed the MPE value even after focusing through the optical system. It can ensure the safety of the design without special management. Typical applications are laser pointers, CD players, CD-ROM equipment, geological prospecting equipment and laboratory analysis, instruments, etc. Laser safety seems to be a little-known knowledge point and a topic that is often overlooked in the industry. The media rarely report on laser safety accidents, and it seems that cold treatment of minor accidents has become a hidden rule of the industry. With a low-output visible laser (power 0.4mW-1mW), the reaction time for people to close their eyes is 0.25 seconds, and the exposure calculated during this period of time cannot exceed the MPE value. Generally, the laser below 1mW will cause dizziness and unable to think. Use closed eyes to protect it. It cannot be said to be completely safe. Do not observe directly in the beam, and do not directly irradiate the eyes of others with Class II lasers. Avoid using distant sight equipment to observe Class II. laser. Typical applications include classroom presentations, Laser pointer, sighting equipment and rangefinders. Yellow warning labels should be placed on this type of laser equipment.
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However, as a laser practitioner, I have heard of some large and small accidents caused by laser safety issues. The first and easiest thing is to cause burns and blindness. The most obvious hazard of laser is the possibility of blindness. Even if the wavelength of the laser used exceeds the sensitive range of the eyes (400-1400nm, visible light and near-infrared light), it may still cause damage to the eyes. Although there is no longer a need to worry about direct blindness from lasers outside the sensitive range, there are still many other ways to make eyes hurt by laser energy. Eye burns, distortion of the eye shape, decreased vision, boiling of eye fluid, degeneration (attenuation) of the protein in the eye leading to milky white blind spots and internal bleeding, etc., are all possible symptoms of direct laser input to the eye. Similarly, just because the beam is not visible light (400-700nm) or near-infrared light (700-1400nm), it cannot prevent instantaneous damage and blindness. If the energy output of the laser is high enough, it may still cause immediate burns, just like touching a hot stovetop. When encountering a laser, you can use safety equipment, such as laser safety glasses, to reduce injuries, but this does not provide adequate safety protection. The safety gear has the worst effect because it cannot prevent injury (only reduces the impact). In addition, as mentioned earlier, the extremely high energy output of certain high-power lasers can melt the laser safety glasses, thereby rendering personal protective equipment ineffective.
2021-09-22 12:18:49
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