Basic knowledge of laser range finder
How does the laser range finder work?
Laser range finders generally use two methods to measure distance: pulse method and phase method. The process of pulse method ranging is as follows: the laser emitted by the range finder is reflected by the measured object and then received by the range finder, and the range finder records the time of the laser back and forth at the same time. Half of the product of the speed of light and the round-trip time is the distance between the rangefinder and the measured object. The accuracy of distance measurement by pulse method is generally around +/- 1 meter. In addition, the measurement blind zone of this type of rangefinder is generally about 15 meters.
What are the main application areas of laser rangefinders?
Laser rangefinders have been widely used in the following fields: electric power, water conservancy, communication, environment, construction, geology, police, fire protection, blasting, navigation, railway, anti-terrorism/military, agriculture, forestry, real estate, leisure/outdoor sports, etc. .
Why is there a difference between the so-called "safe" and "unsafe" laser range finders?
As the name implies, the laser range finder uses laser as the main working substance to work. At present, the working substances of the handheld laser range finder on the market mainly include the following types: semiconductor lasers with a working wavelength of 905 nm and 1540 nm, and YAG lasers with a working wavelength of 1064 nm. The wavelength of 1064 nanometers is harmful to human skin and eyes, especially if the eyes are accidentally exposed to the laser with a wavelength of 1064 nanometers, the damage to the eyes may be permanent. Therefore, in foreign countries, the 1064 nanometer laser is completely banned in the handheld laser rangefinder. In China, some manufacturers also produce 1064nm laser rangefinders.
For 905nm and 1540nm laser rangefinders, we call them "safe". For the 1064nm laser range finder, because it has potential hazards to the human body, we call it "unsafe".
