The difference between the so-called "safe" and "unsafe" laser rangefinders
The working principle of laser rangefinder laser rangefinder generally use two ways to measure the distance: pulse method and phase method. Pulse method distance measurement process is like this: rangefinder emitted laser by the measured object after the reflection and received by the rangefinder, the rangefinder at the same time to record the laser round-trip time. Half of the product of the speed of light and the round trip time is the distance between the rangefinder and the object being measured. The accuracy of the pulse method of distance measurement is generally about +/- 1 meter. In addition, the measuring blind spot of this type of rangefinder is generally about 15 meters.
Working principle of laser rangefinder
Laser rangefinders generally use two methods to measure distance: the pulse method and the phase method.
Pulse method of distance measurement process is this: the rangefinder emits a laser by the measured object after the reflection and is received by the rangefinder, the rangefinder at the same time to record the laser round-trip time. Half of the product of the speed of light and the round trip time is the distance between the rangefinder and the object being measured. The accuracy of the pulse method of distance measurement is generally around +/-1 meter. In addition, the measuring blind spot of such rangefinders is generally about 15 meters.
The difference between the so-called "safe" and "unsafe" laser rangefinders
As the name suggests, laser rangefinders use lasers as the main working substance to carry out their work. At present, the market for handheld laser rangefinders have the following main working substances: working wavelength of 905 nanometers and 1540 nanometers of semiconductor lasers, working wavelength of 1064 nanometers of YAG laser. 1064 nanometers of the wavelength of the human skin and eyes is harmful, especially if the eyes accidentally come into contact with the wavelength of the laser of the 1064 nanometers, the damage to the eyes will probably be permanent. The. Therefore, in foreign countries, handheld laser rangefinders, completely outlawed the 1064-nanometer laser. In China, some manufacturers still produce 1064-nanometer laser rangefinders.
For 905 nm and 1540 nm laser rangefinders, we call it "safe". For 1064nm laser rangefinders, we call them "unsafe" because they are potentially harmful to the human body.
