Safe use of laser rangefinders
When we use a rangefinder to measure distance, especially when using a laser rangefinder, the most common warning we see is "Do not point the rangefinder at the eyes or the human body for irradiation!" However, the laser rangefinder Where does the basis for such "safe" and "unsafe" use operations come from? Today, let's take a look at some precautions to pay attention to when using a rangefinder.
At present, the hand-held laser rangefinders that can be purchased in the market can be roughly classified into: semiconductor lasers with working wavelengths of 905 nm and 1540 nm and YAG lasers with working wavelengths of 1064 nm. And what we say every day "do not point the rangefinder at the eyes or the human body for irradiation" usually refers to the laser with a working wavelength of 1064 nanometers. The laser with a wavelength of 1064 nanometers has certain damage to the skin and eyes of the human body. Especially for the eyes, if you accidentally come into contact with the 1064 nanometer wavelength laser, the damage to the eyes is permanent. Such lasers can be focused on the retina by the human eye, and the retina will be damaged to a certain extent after being irradiated. Severe cases may cause retinal burnout. The semiconductor lasers with operating wavelengths of 905 nanometers and 1540 nanometers are not focused by the human eye. Therefore, most of the handheld laser rangefinders with a working wavelength of 1064 nm in foreign countries have been eliminated, while some domestic manufacturers are still producing such rangefinders.
When using a rangefinder to measure the distance of an object, it must be measured in strict accordance with the safe operation specifications in the instrument manual. Especially in the wild, we mostly use pulsed laser rangefinders, but pulsed laser beams are very concentrated in energy. Monochromatic light source, do not look directly at the laser emission port when using it to avoid irreversible damage. In order to ensure the normal use of the photosensitive element of the laser rangefinder, do not aim the laser emission port at the sun when measuring distances in the field.
