Green laser pointer has to obey the criteria

The laser itself has a very accurate ranging capability, ranging accuracy up to several centimeters, while the accuracy of the LIDAR system in addition to the factors of the laser itself, but also on the laser, GPS and inertial measurement unit (IMU) of the three synchronization inherent factors. With the commercial development of GPS and IMU, LIDAR from a mobile platform (such as on the plane), high-precision data has become possible and widely used. The LIDAR system consists of a single beam of narrow-band laser and a receiving system. Pulse of laser and fired a beam of light hit the object and reflected back, and ultimately received by the receiver. The receiver to accurately measure the propagation time of the light pulse is reflected back from the launch. The price of green laser pointer got higher in the recent months.
Received before the pulse is reflected back to the speed of light because the light pulse propagation, received prior to the issuance of the receiver is always the next pulse. In view of the speed of light is known, the propagation time can be converted to a measurement of distance. Combined with the height of the laser, the laser scanning angle from the GPS position of the laser and the laser emission direction from the INS, and can accurately calculate the coordinates of each ground spot the X, Y, and Z. Frequency of the laser beam fired from a few per second pulse to the tens of thousands of pulses per second. For example, a frequency a million times per second pulse system, the receiver will record the six hundred thousand points in one minute. In general, of LIDAR ground spot spacing of 2-4 meters. green laser pointer has to obey the criteria.
Low-cost adaptive optics system, diode-pumped YAG solid-state laser system. Adaptive to improve a low-cost solid-state laser beam quality optical system has been established. The system includes a deformable mirror, high-voltage amplifiers, solid state laser system, CCD camera control software and the corresponding optimized set of algorithms of this adaptive optics system does not employ a wave-front sensor detection phase information, but to optimize the focus plane on the light intensity by 19 yuan piezoelectric deformable mirrors in a fixed aperture. In order to optimize the mirror, and the best surface profile applied to correct the phase distortion of the solid-state laser system, a global genetic algorithm to introduce. green laser pointer will have the normal dissipation as the working time accumulates.
Far-field intensity signal, which is measured by a CCD camera is used as a genetic algorithm fitness function. In this paper, the performance and the wavefront sensor adaptive optics less genetic algorithm proposed system efficiency. Both the simulation and experimental results are and gives discussed. Typical adaptive optics system {ad} usually consists of three main parts: the World Food Summit wavefront sensor} {{such as a Hartmann Shack sensor }, {take the initiative to correct elements, such as a defoable mirror {} and marks the appropriate closed-loop control algorithm {such as a pie chart algorithm}. When these advertising system is used to correct wavefront aberrations, more often than not, the first step is to measure the direct use of the World Food Summit distortion [1-4], and then the measured wavefront data, the correction can be done accordingly to. green laser pointer can stably work for a long time after being energized.
This advertising system has been widely used in astronomical measurement and correction of random changes caused by atmospheric turbulence aberrations [5]. Because they are quite large, expensive, and therefore can not be directly used for commercial applications, laser. In our laboratory, we designed an available $ 19 wavefront sensors advertising system, the World Food Summit to be used to detect abnormalities, but wavefront aberration information, providing information on diabetes. Within the far-field intensity CC fixed aperture} camera clarity index optimization. It is understood that the genetic algorithm {} is a stochastic parallel algorithm of natural selection, biological genetic basis. It is usually used to search some of the world's multi-object problem [6] the best value. Pay attention to dust-proof and anti-moisture work for green laser pointer.
[7] first reported the success of a genetic algorithm in an AD system. The documents show that the optimal laser intensity distribution, due to the amplitude of the phase distortion through the use of genetic algorithms, as long as in the diabetic range of travel, translation: as long as the correct parameters of genetic algorithm selection. However, genetic algorithm is introduced in [7] is a basic binary coded genetic algorithm. A real-coded genetic algorithm is used to control diabetes to optimize the clarity index. In order to test the effectiveness of the genetic algorithm, the serial simulation work has been completed. The electromagnetic signal strength sent by  green laser pointer is very weak.