Canadian green laser pointer used to drive geese
Results Approximately half of Canadians (48.1%) reported using or being exposed to laser products in the past 12 months. The highest use or exposure of laser products is for college-educated groups (58.6%) and higher income groups (P ⟨0. 0001). The highest levels of exposure or use were laser scanners (38.7%), laser Pointers (11.1%) and recreational lasers (9.7%). Overall, approximately 1% of Canadians reported discomfort or injuries involving laser products in the past 12 months. More than half of the eyes were injured (59.1%). The majority of injuries (74.9%) were caused by the use of equipment by others. Most of the injuries reported were caused by lasers or laser designators used in cosmetic treatments. Discussion Despite the widespread use of laser products and laser irradiation among Canadians, a low percentage of respondents reported injuries. This is most likely because the power of most laser devices is so low that they usually do no harm.
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Class II and IIIa high powered laser Pointers are considered safe because the reflex line of sight response time of the eye is about 0.25 seconds. In & lt; At 5mW, the energy density of the laser beam (W/cm2 or J/cm2) is insufficient to cause biological damage and protect the eye. However, once the 5mW limit is exceeded, the blink reflex no longer provides protection. This is where you have to be careful. The 532nm green laser is produced by pumping an 808nm infrared (IR) beam through a crystal medium, which doubles its frequency to produce a 532nm green beam. At 808nm, the IR beam is invisible to the human eye and is therefore not protected by line-of-sight reflection. Therefore, if the infrared beam escapes from the aperture, it can cause damage to the eye. High quality infrared filters prevent such escape and make the green laser pointer safe.
2021-12-03 10:25:14
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