Laser rangefinder measurement range_What is the error of the laser rangefinder?
A laser rangefinder is an instrument that uses a certain parameter of a modulated laser to measure the distance to a target. The measuring range of the laser range finder is 3.5~5000 meters.
According to the distance measuring method, it is divided into phase method range finder and pulse method range finder. The pulse laser range finder emits a beam or a series 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 launch to reception of the laser beam, and calculates the distance from the observer to the target. The phase method laser rangefinder detects the distance by detecting the phase difference between the emitted light and the reflected light when it propagates in space. The laser range finder is light in weight, small in size, easy to operate, fast and accurate, and its error is only one-fifth to several hundredths of other optical range finders. The picture on the right is a typical phase method range finder and pulse method rangefinder diagram.
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). The standard measurement accuracy is the specified measurement error based on the normal measurement environment. Invalid in special application functions and calculations, such as Pythagorean measurement and tracking mode (continuous tracking measurement).
There are two methods of using the laser rangefinder: the pulse method and the phase method.
If the laser rangefinder uses pulse emission, the absolute accuracy is generally low, but it can achieve good relative accuracy for long-distance measurement.
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 the accuracy of the laser rangefinder is not proportional to the measured distance, and it is the same over the entire distance. However, for a very long distance, the error will increase by +/-5ppm (one millionth unit) (+/-0.5mm/100m).
The accuracy of the laser rangefinder has always been concerned by the industry, and some industries need a relatively high-precision laser rangefinder. For medium and long-distance telescope laser rangefinders, the accuracy of the general rangefinder is 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 range finder can achieve an accuracy within 0.5 yards within 100 meters.
The main source of error in range finders is measurement error. For example, the laser light is blocked or penetrated, the measurement end point is selected incorrectly, and the distance meter selects the measurement starting point incorrectly. Under ideal conditions, the error is small.
