Under given modulation and standard atmospheric conditions, the frequency c/(4 π f) is a constant, and the measurement of distance becomes the measurement of the number of half wavelengths included in the measuring line and the measurement of fractional parts less than half wavelengths, i.e. N or φ, Due to the development of modern precision machining technology and radio phase measurement technology φ The measurement has achieved high accuracy.

As mentioned above, in general, phase laser ranging uses a continuous laser beam with modulated signals. In order to achieve high ranging accuracy, cooperative targets need to be configured. The currently launched handheld laser rangefinder is another new type of rangefinder among pulse laser rangefinders, which is not only small in size and light in weight, but also uses digital phase measurement pulse broadening and subdivision technology. Without the need for cooperative targets, millimeter level accuracy can be achieved, and the measurement range has exceeded 100m, And it can quickly and accurately display the distance directly.

③ This machine is a high-precision instrument that integrates optics, mechanics, and electronics. It should be handled with care during use and is strictly prohibited from squeezing or falling from a height to avoid damaging the instrument.