Is it visible? Daylight laser pointer beam?
This interference from daylight or light is annoying. I checked the information and found that many photoelectric through-beam switches have input and output modulation, just to prevent interference. Before, I wanted to do it with silicon photodiodes, laser pointer irradiation, high-voltage output, ordinary light irradiation, low-voltage output, and amplifiers and comparators at the back end. But on the one hand, the cost is too high and the size is also Big, just give up. I also considered the filter, which is expensive. On the one hand, the size of the receiving tube is small, only 5mm. On the other hand, the laser irradiation direction is random, 360 degrees. I now use a marker to apply a layer on the receiving tube to achieve a "filtering" effect. However, the consistency of manual coloring operation is poor. I now hope to find a special laser pointer that only senses high-intensity red light. I have a laser pointer in my hand, which is far from the thousands of milliwatts at the party, only 30 milliwatts, which is the same as what many friends have bought. But don't think it can't burn balloons or light firewood, just take it lightly!
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People seldom look at the sun at ordinary times, and the degree of harm to the sun may lack a direct concept. Think about it carefully. Many people should have played the game of using a Laser pointer to focus and light a match when they were young. The sunlight gathered by a thin magnifying glass can easily raise the temperature of the match head above its ignition point; and there is more than just the sunlight. It is visible light, as well as a large wave of components that can be absorbed by the eyeball, such as ultraviolet and infrared rays. Direct viewing will easily damage the retina. The laser pointer, when you go out to stargaze, use it to shoot a beam of light to point to a star, which is convenient for identification, for the telescope to quickly locate, and for communication between friends. It is a very useful prop. But its light is really too strong. Although it does not have electromagnetic waves of various wavelengths like the sun, it is better than the high concentration of energy in the beam, and it is also forbidden to look directly at it​.
2021-09-14 11:50:31
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