Application of long-distance laser pointer

At present, laser ranging technology is mainly semiconductor laser intensity modulation continuous phase ranging and laser pulse ranging. Among them, continuous laser phase ranging has high accuracy, but it is affected by power and energy, and the measurement distance is short; while pulsed laser ranging measurement The distance is long, but because the number of pulses is counted, the measurement accuracy is relatively low. At the same time, the longer the working distance, the higher the pulse laser power is required. The existing reports on interferometric laser ranging are all high-precision measurements. For example, the Chinese patent number is 200910071861.8, and the application date is April 23, 2009. The patent "Dual-frequency laser ranging method based on polarization state control and wavelength synthesis" Although the measurement accuracy is on the order of um or even nm, its working distance is only tens of meters, and the structure is complex, which is particularly difficult to realize, and it cannot meet the working requirements of thousands of meters or even tens of kilometers. The combination of a powerful green laser diode and a precision optical collimator can project a bright green laser beam, perfectly illuminating a target up to 300m long. With an optical collimator, you can quickly and completely adjust the diameter and intensity of the beam with only a 360-degree rotation.