What makes a safety laser pointer safe?
Class II and IIIa green laser pointer are considered safe because the eye’s reflective line of sight response time is approximately 0.25 seconds. At <5mW, the energy density of the laser beam (W/cm2 or J/cm2) is not enough to cause biological damage and protect the eyes. However, once the 5mW limit is exceeded, the blink reflex no longer provides protection, why/how do we see each color? Why do we see blue or green? Let them try to explain-let them use words and pictures to think about how we see all the colors. "Laser pointer" is generally used for news reports, education and tour guides. Users use it to project a point of light or point to an object. From its function, it does not belong to the category of toys. Buying children's laser pointers and laser guns requires Choose a formal channel. Please stop buying products without laser radiation category information, brand models or warning instructions.
Tags
Mains
When consumers buy children's toy guns, they can check the outer packaging, try the product, or consult the sales staff to confirm whether the toy contains a high powered laser. Consumers are advised not to buy toys with laser emission or laser aiming functions for children. If you have purchased related products, please check carefully whether the laser radiation category is Class 1. After determining which lens to use for focal length, the relative position of the focal point and the surface of the workpiece is particularly critical to ensure the cutting quality. Since the power density at the focal point is the highest, in most cases, the position of the focal point during cutting is exactly on the surface of the workpiece or an area slightly lower than the surface of the workpiece. Ensuring that the relative focus area with the workpiece is constant throughout the cutting process is a necessary condition for achieving stable cutting quality. Sometimes the lens heats up due to improper cooling, causing the focal length to change, and it is necessary to quickly adjust the focus position.
2021-12-22 11:32:13
Your Answer: