The hazard of fire starting laser pointer
Some laser pointers have a power of 100 to 300 milliwatts, which can instantly ignite matches, firecrackers, and paper, and even cause fires. Exposure for a long time will cause damage to the retina and skin surface of the eyes, resulting in permanent damage and even blindness. The reason why the Laser pointer ignites is because the laser beam has high energy. This high energy refers to the power per unit area. The high power density is absorbed by the object and the temperature is quite high. It can melt any metal in an instant, such as laser cutting. . Laser products generally have a working temperature range, usually between 0-40 degrees. There are also between 10-40 degrees.When the temperature of the laser pointer is too low, such as lower than the working temperature, the laser will start incompletely and the light will be very weak. As the stability increases, the laser light will gradually brighten until it stabilizes.
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However, if the temperature is higher than the normal temperature, the laser light will drop, but the performance is that it will be re-lit after being left for a while and it is normal.Of course, this kind of situation does not happen continuously during the downtime. If this happens, it can only indicate that the product is unstable and there are problems.Generally, pen-style lighting is recommended for no more than half a minute to 1 minute at a time. The flashlight type can be used within 3 minutes because of its large size. As the power increases, the time will be shortened accordingly. The main reason is that the laser heats up so much that you are worried about burning the circuit or the luminous body.Compared to lighting a match, it takes a little longer to light a cigarette, but it is also very fast. The reporter focused the laser pointer again and irradiated a cigarette 10 cm away. The reporter observed that when the laser beam hit the cigarette butts, there was smoke. After 15 seconds, a red light flashed at the cigarette butt, and the cigarette was lit. Then I irradiated the newspaper with the focused laser pointer, and the newspaper immediately emitted a puff of smoke. When the irradiation time lasted for 10 seconds, the newspaper 10 cm away from the laser pointer was burned with a hole, and the newspaper on the lower layer was burned with a black line. In the experiment, the reporter accidentally shone the light beam emitted by the laser pointer on the back of the hand, and the skin immediately felt like a needle stick.
2021-09-17 12:48:35
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