Laser range finder measurement range_What is the error of the laser range finder?
Laser rangefinder is an instrument that uses a certain parameter of modulated laser to measure the distance to a target. The measurement range of the laser rangefinder is 3.5~5000 meters.
According to the ranging method, it is divided into phase method rangefinder and pulse method rangefinder. The pulse laser rangefinder emits a beam or a sequence of short pulse laser beams to the target during operation, and the photoelectric element receives the laser reflected by the target. The timer measures the time from emission to reception of the laser beam and calculates the distance from the observer to the target. The phase method laser distance meter detects distance by detecting the phase difference that occurs when emitted light and reflected light propagate in space. The laser rangefinder is light in weight, small in size, simple to operate, fast and accurate, and its error is only one-fifth to one-hundredth of that of other optical rangefinders.
What is the error of the laser rangefinder?
The measurement accuracy is based on ISO/R1938-1971 recommended by ISO, with 95% reliable statistics (2s, which is twice the standard deviation). Standard measurement accuracy is a specified measurement error based on ordinary measurement environments. Not valid in special application functions and calculations, such as Pythagorean measurement and tracking mode (continuous tracking measurement).
There are two ways to use laser rangefinders: pulse method and phase method.
If the laser rangefinder uses pulse emission, the absolute accuracy is generally low, but when used for long-distance measurements, it can achieve good relative accuracy.
If the laser rangefinder uses phase testing, the accuracy can reach plus or minus 1 mm, which is the highest among rangefinders.
The error in laser rangefinder accuracy is not proportional to the distance measured and is the same over the entire distance. However, over long distances, the error will increase to +/-5ppm (parts per million) (+/-0.5mm/100m).
The accuracy of laser rangefinders has always been concerned by people in the industry. In some industries, relatively high-precision laser rangefinders are needed. For medium and long-distance telescope laser rangefinders, the highest accuracy of this type of rangefinder is generally 1 yard +-1. At present, it can be called a high-precision laser rangefinder, with an accuracy of 0.5 yards +-1. This high-precision rangefinder can achieve an accuracy of within 0.5 yards within 100 meters.
The main error in rangefinders comes from measurement errors. For example, the laser light is blocked or penetrated, the measurement end point is selected incorrectly, the rangefinder selects the measurement starting point incorrectly, etc. Under ideal conditions, the error is small.
