Danger from laser radiation
The danger of laser radiation, when it hits human tissue, the laser will cause basically the same reaction as the light emitted by a traditional lamp. Generally speaking, the tissue response depends on the light intensity, wavelength and exposure time as well as the optical properties of the tissue, especially reflection, scattering and absorption. Refractometers for the cornea, aqueous humor, and lens The wavelength of the eye and vitreous humor is between 400 nm and 1400 nm, and it is up to 90% transparent. Highly focused laser radiation has a particularly high potential risk in this spectral range because it strikes the retina with increased radiation intensity due to the focusing properties of the lens of the eye. The additional increase is approximately 5x105.
Tags
Technology
Regarding the risk of laser radiation to the eyes, the decisive factor is not the perception of spectral brightness, but mainly the laser power or the irradiance on the retina. Laser pointer with physiologically more favorable wavelengths therefore have a much lower potential risk than laser pointers with other wavelengths compared to the necessarily stronger risks. The safety concept of Class 2 laser was previously based on the following assumptions: the eyelid closure reflection and avoidance response caused by accidental exposure of the pupil and eyes, the laser pointer was completed within 0.25 seconds. However, recent studies have shown that every 5 people lack this protection, because neither the blinking reflex nor the aversion reaction occurs within 0.25 seconds [Rei 03]. Because of this, it can even use Class 2 lasers, that is, the maximum output power is 1 mW, the exposure time exceeds 0.25 seconds, and the maximum allowable radiation (MZB) is exceeded to endanger the eyes [Rei 05]. When consciously looking at the laser beam, such as children, even if the exposure time is relatively short, there will be glare effects and afterimages, and cause secondary hazards that can be connected.
2021-09-27 12:18:04
Your Answer: