How to judge the actual power of green laser pointer

 How to judge the actual power of green laser pointer .
Rangefinder brief works. Now pulsed laser ranging brief description of how it works. Simply put, the pulse method ranging process is this: rangefinder emits laser has been measured in the reflectance of the object after rangefinder to receive the range finder at the same time to record the laser round-trip time t, the speed of light c to and from half of the time t multiplied by the distance between the rangefinder and the object to be measured. General a typical laser ranging system should have the following four modules: the laser module; laser receiver module; distance calculation and display module; laser collimating and focusing module, shown in Figure 2-1. System work, from the transmitter unit emits a laser. And for green laser pointer whose power is even higher than 50mW.After the process of manufacturing green laser pointer changes
The diffuse reflection back to reach the target to be tested, the receiving unit to receive, enlarge, reconstructive surgery to the distance calculation unit calculation after the target distance. Figure 2-1 pulsed laser ranging system block diagram. Launch a bunch of strong narrow laser pulse to the measured object distance measuring point, in which a small portion of laser light pulses transmitted to the target is reflected back ranging point of the optical functions ranging system receiver. Assume that the light pulses back and forth between the launch point and target experienced a time interval t, the measured target distance D as follows: the laser pulse range finder optical principles of the structure. The general structure of the rangefinder. These methods are used to determine the power of green laser pointer .PLIF technique in the diagnosis of aero-engine combustion more attention. LIFS temperature measurement principles and methods are more complex, in particular, the quenching rate level in dealing with different problems, and weaknesses in the capacity measurement and spatial resolution of the unsteady flame, so the temperature of LIFS research is generally not paid enough attention. LIFS technology also has its own advantages, such as barium 4 amount, the spectrum with quantization is more convenient, simple optical path in the flame of the low spatial and temporal resolution advantages. The early 1990s, R. K. Hanson and other hydroxyl and nitric oxide composition and temperature distribution measurement techniques are explored, and the application attempts to shock heating fluid model supersonic combustion engine. The result of green laser pointer is always very accurate.