If the laser light path of laser pointer is to be seen

 If the laser light path of laser pointer is to be seen.
Which the coefficient matrix for the light distribution. If the inner and outer radius of each ring is known, the focus of the irradiation wavelength of the light receiving lens, can be obtained from the above equations according to the detected energy in each ring, the particle size distribution of post, which is the theoretical basis of laser particle size analyzer . Laser particle size analyzer, test speed, wide measuring range, a wide range of applications, can be used for the measurement of spray, powder or suspension. Moreover, laser particle size analyzer in the measurement process does not destroy the sample field, is a non-contact measurement, online measurement. Laser Particle Size Analyzer automatically on the technology development status. With the measuring instrument automation, intelligent requirements enhanced laser particle testing techniques are constantly self-improvement. The power of 200mW red laser pointer is ten times than 20mW green laser pointer. Comprehensive parity on the accuracy and the time required to determine the required cut-off conditions. The program, designed by the use of the standard machine measurement experiments verify the effectiveness of the system, through the analysis of experimental results, repeatability and accuracy. Laser particle test the technology development overview. The particle size distribution in the industrial and agricultural production, especially in products and raw materials in powder form, has been a very important measurement indicators. Performance and quality of its products played a significant role, such as cement fineness and particle size for the full use of cement activity and improve strength has an important impact. Therefore, how to effectively measure the particle size distribution, to further adjust or control of its existence, it is particularly important. The power consumption of laser pointer should be reduced to the lowest level.
With the continuous development of science and technology, particle measurement methods are constantly changing and updated and improved. The basic working principle can be divided into several categories: sedimentation method, sieving, microscopy, the method of induction and of light scattering method. These methods have their own characteristics and range of applications, but the optical method for its test speed, simple operation, good repeatability, has been widely adopted in the field of particle measurement. The University of Sheffield Swithenbank, who for the first time in 1976 based on the Fraunhofer diffraction theory, using 15 units of the ring detector successful laser particle size measurement. Since the beginning, have appeared in a variety of optical measurement methods. The visual effect of laser pointer is very obvious.
Such as the use of the Doppler shift principle to measure sub-micron and nano-particle size by dynamic light scattering techniques; by measuring the particle size and the number of incident and transmitted light intensity of demand distribution of extinction method to measure the scattering of the particles; within the range of 90 to 1800 optical signal back light scattering method.