Laser rangefinder measurement methods explained
Explanation of measurement methods for laser rangefinder: Laser rangefinder has the characteristics of good linearity, small divergence angle, and concentrated energy. When using laser for ranging, it is usually classified into different types based on the length of the ranging and the principle of ranging. There are usually three types of measurement principles: pulse method, phase method, and triangle method. Different measurement methods have different applicable fields. The pulse method (including the time of flight method) emits a laser pulse from a laser generator, which is reflected back to the generator when it encounters an object. Measure the time interval between laser emission and reception, and then divide it by the beam to calculate the distance from the starting point to the target; The phase method emits continuous pulse waves from the transmitting source, and calculates the distance by calculating the phase difference between the transmitting wave and the receiving wave; The triangulation method involves emitting a beam of laser from an emitting source, which is reflected back to the receiving end when it encounters a target object. The launch point, target object, and receiving point form a triangle, and by measuring the angle of the triangle, the distance from the instrument to the target can be measured.
Scope of application of laser rangefinder:
The phase method is usually used for close range measurement, with measurement distances ranging from tens of centimeters to tens of meters, measurement accuracy typically reaching millimeters, and measurement time being relatively long.
The triangulation method is usually used for very close range measurements, with measurement distances typically in the tens of millimeters, measurement accuracy can reach the micrometer level, and measurement time is very short.
Pulse method is commonly used for long-distance and long-distance measurement, with measurement distances ranging from several hundred meters to several kilometers, measurement accuracy typically in centimeters to decimeters, and short measurement time.
