Laser ranging uses a laser as a light source for ranging. According to the way the laser works, it can be divided into continuous laser and pulsed laser. Helium-neon, argon-ion, krypton-cadmium and other gas lasers work in continuous output state and are used for phase laser ranging; double heterogallium arsenide semiconductor lasers can be used for infrared ranging; ruby, neodymium glass and other solid-state lasers can be used. for pulsed laser ranging. Compared with the photoelectric rangefinder, the laser rangefinder can not only work day and night, but also improve the distance measurement accuracy and significantly reduce the weight due to the good monochromaticity and strong directionality of the laser, as well as the semiconductor integration of the electronic circuit. and power consumption, making it a reality to measure the distance to distant targets such as artificial earth satellites and the moon. If the laser is fired continuously, the measuring range can reach about 40 kilometers, and the operation can be carried out day and night. If the laser is pulsed, the absolute accuracy is generally low, but for long-distance measurement, a good relative accuracy can be achieved. The measurement distance of the handheld laser rangefinder is generally within 200 meters, and the accuracy is about 2mm. This is the most widely used laser rangefinder. In addition to measuring the distance in function, it can generally calculate the volume of the object to be measured. Telescopic
laser rangefinders generally have a measurement distance of about 600-3000 meters. This type of rangefinder measures a long distance, but the accuracy is relatively low, and the accuracy is generally about 1 meter. The main application range is long-distance measurement in the field. The measuring distance of industrial laser rangefinder is about 0.5-3000 meters, and the accuracy is within 50mm. A reflector should be added beyond 300 meters. Some products can also measure the speed while measuring the distance. Mainly used in position control, such as vehicles and ships; positioning cranes; loading and unloading and handling equipment; aircraft measurement, mainly for measuring flight height; metallurgical process control; Water level measurement. Typical sensors are LDM301, LDM4x.
