The irradiance functions of green laser pointer can be used by the customer

Pulse ranging method is by measuring the time difference between transmitting and receiving the laser pulse signal indirectly measured target distance. Shown in Figure 3.30: Figure 3.30 pulse laser range finder principle. The laser transmitter to emit a pulse signal to the target, to reach the receiver after diffuse reflection by the target system, set to measure the distance S, the speed of light is c, the measured laser signal round-trip propagation time difference, there are: phase ranging method. Ranging phase method is to use the radio band frequency of the laser beam amplitude modulation generated by measuring the modulated optical signal in the measured distance between the transmission phase, indirect determination of the round-trip time, and further to calculate the measured distance. Phase scanner can be divided into the type of AM, FM, phase transformation type. Based laser signals to and from the spread of the phase difference for the pulse frequency. The irradiance functions of green laser pointer  can be used by the customer.
The measured distance S: we can see by the formula (3.23), ranging this way is an indirect ranging, phase difference between the detection of transmit and receive signals, measured the distance of the target. Higher ranging accuracy, the main applications in precision measurement and medical research, the precision can reach a millimeter. The above three distance methods have advantages and disadvantages, mainly concentrated in the measurement range and accuracy, the longest pulse measurement, but more accurate with increasing distance from the lower. Phase method is suitable for medium-range measurement with high measurement accuracy, but it is through two indirect measurement of the distance value, so the less the application of this location principle of 3D laser scanner, mainly the United States Faro such as the LS880, Photon, 80. Triangulation measurement range is the shortest, but the highest accuracy for close indoor measurement. To achieve the specific purpose with green laser pointer .
Angle measuring principle. Angular displacement measurement. Dial goniometer way different from conventional instruments, the laser scanner scanning angle by changing the laser path. Two stepper motors and scanning prism with respectively horizontal and vertical scanning. The stepper motor is an electric pulse signal conversion into angular displacement control micro-motor, it can achieve the precise positioning of the laser scanner. In the process of the scanner work, broken down by the stepper motor control technology, access to steady and accurate step angle: where is the motor's rotor teeth, and m is the number of motor, b is the various connected winding line number of states and the number of run shot. Obtained on the basis of scanning the prism turned the angle value, and then simultaneous measurement precision clock control encoder, have each laser pulse can be horizontal, vertical scanning angle observation value. The 2 in 1 type green laser pointer means the laser pointer has two kinds of laser heads.
The linear displacement measurement. Laser scanning angle measuring system from the laser transmitter, rectangular prism and CCD components, the laser beam incident to the rectangular prism and fired at the measured object by the refraction of the prism, when the rotation of the 3D laser scanner, the outgoing laser beam will form a line of the scanning area, the CCD record line displacement, may have to scan the angle value. Scanning principle. 3D laser scanner built-in rotating polygon scanner prism of the precise control of the servo drive motor system, to determine the laser beam outgoing directions, so that a quick scan of the pulse laser beam along the horizontal direction and the longitudinal axis. At present, the scan control device: oscillating scanning mirror and rotate regular polyhedron scanning mirror, as shown in Figure 3.31. The customer can customize the laser effect of  laser pointer  .