Common rangefinders can be divided into short-range, medium-range and elevation rangefinders from the range;
From the modulation objects used by the rangefinder, it can be divided into: photoelectric rangefinder and acoustic rangefinder.
Optical distance meter
According to the ranging method, the photoelectric rangefinder is divided into two types: phase method rangefinder and pulse rangefinder.
The pulse rangefinder uses a beam of light to the target object to measure the time it takes for the target to reflect the light back, so as to calculate the distance between the instrument and the target. Because the laser has good directionality and a single wavelength, it is a photoelectric measurement. The distance meter generally uses the laser as the modulation object, so the pulsed distance meter is also commonly known as the laser distance meter.
The laser rangefinder using the pulse method can achieve a wide ranging range and can be used for indoor and outdoor measurements. Its typical ranging range is 3.5 meters to 2000 meters, and the high-range laser rangefinder can reach 5000 meters. meters, and laser rangefinders for military use can reach longer ranges. Due to the ability to measure long-distance measurement targets, in order to visually observe the ranging target by the user, the laser rangefinder generally has a telephoto system, which is also called a laser rangefinder telescope. Figure 1 shows three Typical diagram of a laser ranging telescope with a tube.
