Brief Description of Three Laser Range Finders

Laser measuring is based on laser as a light source. According to the way of laser works, it can be divided into continuous laser and pulse laser. He-Ne, argon ion, krypton-cadmium and other gas lasers work in continuous output state for phase laser ranging, double heterogenous GaAs semiconductor lasers for infrared ranging and solid lasers such as ruby and Nd glass for pulsed laser ranging.

Laser rangefinder has the characteristics of good monochrome and strong directivity. Compared with photoelectric rangefinder, it can not only work day and night, but also improve the ranging accuracy, reduce the weight and power consumption significantly, and make the distance measurement to long-range targets such as artificial earth satellite and moon become reality. If the laser is continuously emitted, the range can reach about 40 kilometers, and the operation can be carried out day and night. If the laser is pulsed, its absolute accuracy is generally low, but it can achieve good relative accuracy for long-distance measurement.

(1)Handheld Laser Range Finder
The measuring distance is generally within 200 meters, and the accuracy is about 2 mm. This is the most widely used laser range finder. Functionally, besides measuring distance, it can also calculate and measure the volume of an object.

(2)Telescope Laser Range Finder
The measuring distance is generally about 600-3000 meters. The measuring distance of this kind of rangefinder is relatively long, but its accuracy is relatively low, and its accuracy is generally about 1 meter. The main application range is field long-distance measurement.

(3)Industrial Laser Range Finder
The measuring distance is about 0.5-3000 meters, and the precision is within 50 mm. Reflector board should be installed outside 300 meters. Some products can also measure speed while measuring distance. Mainly used in position control, such as vehicles and ships; positioning cranes; loading and unloading and handling equipment; aircraft measurement, mainly for flight height measurement; metallurgical process control; measurement of inaccessible objects, such as pipe filling, pipelines, containers, and water level measurement. Typical sensors are LDM301 and LDM4x.

From simple distance measurement to three-dimensional space positioning, the function and application fields of laser range finder are also developing.