How does a laser rangefinder work?
Laser rangefinders generally use two methods to measure distance: the pulse method and the phase method. The process of pulse method ranging is as follows: the laser emitted by the rangefinder is reflected by the object to be measured and then received by the rangefinder, and the rangefinder records the time of the laser round trip at the same time. Half 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 distance measurement by the pulse method is generally about +/- 1 meter. In addition, the measurement blind area 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 rangefinders?
As the name suggests, laser rangefinders work with lasers as the main working substance. At present, the working materials of the handheld laser rangefinders on the market mainly include the following: semiconductor lasers with working wavelengths of 905 nanometers and 1540 nanometers, and YAG lasers with working wavelengths of 1064 nanometers. The wavelength of 1064 nanometers is harmful to human skin and eyes, especially if the eyes are accidentally exposed to the laser 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 1064-nanometer laser rangefinders.
For the 905nm and 1540nm laser rangefinders, we call them "safe". For the 1064 nm laser rangefinder, we call it "unsafe" because of its potential harm to the human body.
