The laser range finder is an instrument that uses a certain parameter of the modulated laser to accurately measure the distance of the target. The pulsed laser rangefinder emits a beam or a sequence of short-lived pulsed laser beams to the target when it is working, and the photoelectric element receives the laser beam reflected by the target. The timer measures the time from the launch to the reception of the laser beam, and calculates The distance from the meter to the target.
When the power of the emitted laser beam is sufficient, the measuring range can reach about 40 kilometers or even farther. The laser rangefinder can work day and night, but when there are substances with high laser absorption rate in the space, the distance and accuracy of the ranging will decrease.
The world's first laser was a ruby laser developed successfully in 1960 by Maiman, a scientist from the Hughes Aircraft Company of the United States. The U.S. military soon launched research on military laser devices on this basis. In 1961, the first military laser range finder passed the demonstration test of the US military, and the laser range finder soon entered the practical stage.
Laser is a new technology developed in the 1960s. It is a kind of light with pure color, highly concentrated energy and good directionality. A laser rangefinder is an instrument that uses lasers to measure distances. How it works is simple: measure distance by measuring the time from when the laser light starts firing to when it bounces off the target. For example, a laser range finder is used to measure the distance of the moon. If the time from the start of laser emission to the reflection from the moon is measured as 2.56 seconds, the one-way time from the laser to the moon is equal to 1.28 seconds, and the speed of the laser is the speed of light, which is equal to Three hundred thousand kilometers per second. Therefore, the measured distance of the moon from the earth is the product of the one-way time and the speed of light, which is 384,000 kilometers. In order to transmit and receive laser light, and to carry out timing, the laser range finder is composed of a laser transmitter, a receiver, a clock frequency oscillator and a distance counter.
