The introduction of the historical development of laser rangefinder
Laser rangefinder is an instrument that uses a certain parameter of modulated laser to accurately measure the distance of the target. The pulse laser rangefinder emits a short pulse laser beam or a series of short pulse laser beams to the target when working, and the laser beam reflected by the target is received by the photoelectric element. The timer measures the time from emission to reception of the laser beam and calculates the distance from the rangefinder to the target.
When the power of the emitted laser beam is sufficient, the measuring range can reach about 40 kilometers or even more, and the laser rangefinder can work day and night, but when there is a substance with high absorption rate of laser in the space, the ranging distance and accuracy will decrease.
The first laser in the world was a ruby laser first developed by Meiman, a scientist of Hughes Aircraft Company in the United States in 1960. On this basis, the U.S. military soon carried out research on military laser devices. In 1961, the laser rangefinder used by the First Taiwan Army passed the demonstration test of the US military, and the laser rangefinder soon entered the practical stage.
As the price of laser rangefinder keeps dropping, laser rangefinder is gradually used in industry. A number of new micro rangefinders have appeared at home and abroad, which have the advantages of fast ranging, small size and reliable performance, and can be widely used in industrial measurement and control, mines, ports and other fields.
Laser is a new technology developed in the 1960s. It is a kind of light with pure color, highly concentrated energy and good directivity. Laser rangefinder is an instrument that uses laser to measure distance. Its working principle is simple: the distance is determined by measuring the time from the start of laser emission to the reflection of laser from the target. For example, a laser range finder is used to measure the distance from the moon. If the time from the start of laser emission to the reflection from the moon is determined to be 2.56 seconds, the one-way time for laser emission to the moon is equal to 1.28 seconds, and the speed of laser is the speed of light, which is equal to 300,000 kilometers per second. Therefore, the measured distance from the moon to the earth is the product of one-way time and the speed of light, that is, 384 thousand kilometers. In order to transmit and receive laser and time, the laser rangefinder consists of laser transmitter, receiver, clock oscillator and distance counter.
Laser rangefinder can also be used to track and measure satellites, measure the flying height of aircraft, aim and measure targets, and conduct topographic mapping and reconnaissance.
