Explanation of measurement method of laser rangefinder
Explanation of measurement method of laser rangefinder: laser rangefinder has the characteristics of good linearity, small divergence angle and concentrated energy. When laser is used for ranging, it is usually divided into different types according to the length and principle of ranging. From the measurement principle, it is usually divided into three types: pulse method, phase method and triangle method. Different measurement methods have different application fields. Pulse method (including time-of-flight method) emits a laser pulse from a laser generator, and when the laser pulse meets an object, it is reflected to the generator. Measure the time interval between the laser emission time and the receiving time, and then divide it by the beam, and the distance from the starting point to the target can be calculated. In the phase method, a continuous pulse wave is emitted by a transmitter, and the distance is calculated by calculating the phase difference between the transmitted wave and the received wave. Triangulation method emits a laser beam from a source, and the laser beam is reflected to the receiving end when it meets the target. The emit point, that target object and the receiving point form a triangle, and the distance from the instrument to the target can be measure by measuring the angle of the triangle.
Scope of application of laser rangefinder:
The phase method is usually used for short-distance measurement, the measuring distance is from tens of centimeters to tens of meters, the measuring accuracy can usually reach millimeters, and the measuring time is relatively long.
Triangulation method is usually used for very close measurement, the measurement distance is usually tens of millimeters, the measurement accuracy can reach micron level, and the measurement time is very short.
Pulse method is usually used for long-distance and large-range measurement. The measurement distance is from several hundred meters to several kilometers, the measurement accuracy is usually cm-decimeter, and the measurement time is short.
