The reason that green laser pointer is so popular is it is very practical in use

The reason that green laser pointer is so popular is it is very practical in use.
Light pulses toward the target, the diffuse reflectance of the target, there is always part of the light from the backtrack to the entry into the receiving telescope, it is also through the filter media converter, amplifier shaping circuit and into the time measurement system, so that to stop timing. The time recorded by the time measurement system has been calculated directly on the display, given the distance of the rangefinder to the target. Simplified block diagram of the laser pulse range finder. Laser phase-ranging. Ranging principle of laser phase. Phase ranging indirectly by measuring the phase difference between the continuous modulation laser on the distance d to be tested to measure the propagation time. Laser phase range finder principle block diagram shown in Figure 3.10, the optical path is similar to the pulse laser range finder, but the light is not a pulsed laser, instead of using the laser intensity is modulated.
System and the automatic pilot interface, routes and a high degree of automatic control. Imaging lidar water dropping things. Northrop Corporation for the the ALARMS airborne mine detection system developed by the U.S. Defense Advanced Research Projects Agency, with automatic, real-time detection and three-dimensional positioning capability, high positioning resolution, 24-hour work using the ovate scanning probe water under suspicious objectives. Kaman Aerospace Corporation successfully developed airborne underwater imaging laser radar, the biggest feature of the underwater target imaging. Of each laser pulse of the imaging laser radar coverage area, so the search far more efficient than non-imaging laser radar. In addition, the imaging laser radar can display the characteristics of the shape of the underwater target, easier to identify the target, this is a big advantage in the imaging laser radar. Chemical and biological warfare agent detection lidar.
Remote sensing layer segments are mostly of blind spots, remote sensing of the ground radio and satellite-down passive optical remote sensing there are the shortcomings of the resolution and accuracy. Detection laser radar used to detect the intense activity of the sun and space disaster weather, "precisely the emergence of a more effective solution. It can achieve 30 to 110 km in the upper atmosphere and lower ionosphere segment connectivity detection of high academic value and application prospect. Doppler wind lidar. Lidar by measuring naturally occurring atmospheric aerosol particles or molecular motion (wind speed caused by the Doppler shift of the backscattered signal) generated using a frequency discriminator or coherent echo signal frequency, measured to the scattering signal of the Doppler frequency shift Δν, Δν wind speed relationship can be inverted radial velocity values.