A laser rangefinder is an instrument that accurately measures the distance to a target by using laser. When the laser rangefinder is in operation, it emits a very fine laser beam towards the target. The reflected laser beam is received by the photoelectric element, and the timer measures the time from the emission to the reception of the laser beam to calculate the distance from the observer to the target. If the laser is continuously emitted, the measurement range can reach about 40 kilometers and it can operate day and night.
In the construction industry, there is a handheld laser rangefinder used for house measurement. Its working principle is the same. The plane of the object to be measured must be perpendicular to the light. Usually, precise distance measurement requires the cooperation of a total reflection prism. However, the rangefinder used for house measurement directly measures by reflecting the smooth wall surface, mainly because the distance is relatively short and the signal strength of the reflected light is large enough.
This takes advantage of the monochromaticity and coherence of lasers, as well as their strong directionality, to achieve high-precision measurement and detection, such as measuring length, distance, speed, Angle, and so on. The widely used handheld and portable rangefinders nowadays have an operating range of several hundred meters to tens of kilometers and a measurement accuracy of about five meters.
