A laser rangefinder is an instrument that uses a laser to accurately measure the distance to a target. The laser rangefinder emits a very thin laser beam 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 emission to the reception of the laser beam, and calculates the distance from the observer to the target. The laser rangefinder is light in weight, small in size, simple in operation, fast and accurate, and its error is only one fifth to several hundredths of other optical rangefinders. The laser rangefinder is light in weight, small in size, simple in operation, fast and accurate, and its error is only one-fifth to several hundredths of other optical rangefinders, so it is widely used in terrain measurement, battlefield measurement, tank measurement, etc. , ranging from aircraft, ships and artillery to targets, measuring the height of clouds, aircraft, missiles and artificial satellites, etc. It is an important technical equipment to improve the accuracy of high tanks, aircraft, ships and artillery. The laser rangefinder uses the principle of infrared ranging or laser ranging. The principle of ranging can basically be attributed to the time required to measure the light to and from the target. Since it is difficult to measure the time directly, it is usually to measure the phase of the continuous wave, which is called phase measurement. distance meter. Of course, there are also pulsed rangefinders. It should be noted that the phase measurement does not measure the phase of the infrared or laser, but the phase of the signal modulated on the infrared or laser. The construction industry has a handheld laser rangefinder for house measurements that works the same way. Problems that need to be paid attention to when using the laser rangefinder: The laser rangefinder cannot be directly measured at the human eye to prevent damage to the human body. At the same time, vibrometers and general laser rangefinders are not waterproof, so you need to pay attention to waterproofing.
