Laser rangefinder is an instrument that uses modulated laser parameters to measure the distance of a target. The testing range of the laser rangefinder is 3.5 to 5000 meters.
According to the distance measurement method, it can be divided into phase based distance meters and pulse based distance meters. The pulse laser rangefinder emits a beam or a series of short pulse laser beams towards the target during operation, receives the laser beam reflected onto the target by the photoelectric element, and the timer tests the time required for the laser beam to travel from transmission to reception. Calculate the distance from the observer to the object. The phase method laser rangefinder detects distance by detecting the phase difference generated when the emitted light and reflected light propagate in space. Laser rangefinder is lightweight, small in size, easy to operate, fast and accurate, with an error of only one-fifth to a fraction of other optical rangefinders. It is a typical phase rangefinder and pulse rangefinder.
What is the principle of laser rangefinder?
1. Use infrared or laser ranging principles
The principle of distance measurement can basically be summarized as measuring the time required for light to travel back and forth to the target, and then calculating the distance D through the speed of light c=299792458m/s and atmospheric refractive index N. Due to the difficulty of directly measuring time, measuring the phase of continuous waves is generally referred to as a caliper. Of course, there is also a pulse rangefinder.
Not measuring the phase of infrared or laser, but testing the phase of the modulated signal on infrared or laser. The construction industry has portable laser rangefinders for measuring residential properties, and their working principle is as follows.
2. The plane of the object should be perpendicular to the light
Generally speaking, distance measurement requires a total reflection prism, and the distance measuring instrument used for building measurement is directly tested using smooth wall reflection. Mainly because of the close distance, the signal strength reflected by the light is high. At the same time, it can be seen that it should be vertical. Otherwise, the return signal is too weak to obtain the correct distance.
You can use the plane of a diffuse reflection object.
Generally speaking, it is possible. In practical engineering, using thin plastic sheets as reflective surfaces solves the serious dispersion problem.
4. Pulse laser rangefinder entertainment grade products can achieve a display accuracy of 1 meter and a measurement accuracy of 1 meter. Measurement grade products have a display accuracy of 0.1 meters and a measurement accuracy of 0.15 meters.
The accuracy of phase laser rangefinder can reach 1 millimeter error, which is suitable for various high-precision measurement purposes.
What is the purpose of a laser rangefinder?
Laser rangefinders are widely used in terrain measurement, battlefield measurement, target distance measurement of tanks, aircraft, ships, artillery, altitude measurement of clouds, aircraft, missiles, satellites and other fields. It is an important technical equipment for improving the accuracy of high tanks, aircraft, ships, and artillery. With the continuous decrease in the price of laser rangefinders, they are gradually being used in industry and can be widely used in industrial measurement and control, mining, ports and other fields.
