激光粒度分析仪测试粒度分布概况_leyu·乐鱼(中国)体育官方网站

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激光粒度分析仪测试粒度分布概况

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激光粒度分析仪www.jnwinner.com是一种常用的测量仪器，具有测试速度快、重复性好、准确性好、操作简便等优点，在粉体加工领域中得到了广泛的应用。激光粒度仪怎样测试粒度分布呢?

Laser particle size analyzer (www.jnwinner.com) is a common measuring instrument. It has many advantages, such as fast testing, good repeatability, good accuracy, easy operation and so on. It has been widely used in the field of powder processing. How can the laser particle sizer test the particle size distribution?

　　激光粒度分析仪是根据颗粒能使激光产生散射这一物理现象测试粒度分布的。由于激光具有很好的单色性和极强的方向性，所以在没有阻碍的无限空间中激光将会照射到无穷远的地方，并且在传播过程中很少有发散的现象。

The laser particle size analyzer is based on the physical phenomenon that particles scatter the laser to measure particle size distribution. Because of the good monochromatic nature and strong directionality of the laser, the laser will reach infinity in the unlimited space without obstruction, and there is very little divergence during the propagation.

　　米氏散射理论表明，当光束遇到颗粒阻挡时，一部分光将发生散射现象，散射光的传播方向将与主光束的传播方向形成一个夹角θ，θ角的大小与颗粒的大小有关，颗粒越大，产生的散射光的θ角就越小;颗粒越小，产生的散射光的θ角就越大。即小角度(θ)的散射光是有大颗粒引起的;大角度(θ1)的散射光是由小颗粒引起的。进一步研究表明，散射光的强度代表该粒径颗粒的数量。这样，测量不同角度上的散射光的强度，就可以得到样品的粒度分布了。

Show that the Mie scattering theory, when the beam particles encounter blocked, scattering phenomenon will occur as part of the light propagation direction, light scattering and propagation direction of the main beam will form an angle, angle and particle size on the size of the larger particles, the scattering light generated by the angle of the smaller particles; the small, scattered light from the angle of the greater. That is, small angle (theta) scattered light is caused by large particles; large angle (theta 1) scattered light is caused by small particles. Further studies show that the intensity of scattered light represents the size of the particle. In this way, the particle size distribution can be obtained by measuring the intensity of scattered light at different angles.

　　激光粒度分析仪www.jnwinner.com为了测量不同角度上的散射光的光强，需要运用光学手段对散射光进行处理。大家在光束中的适当的位置上放置一个富氏透镜，在该富氏透镜的后焦平面上放置一组多元光电探测器，不同角度的散射光通过富氏透镜照射到多元光电探测器上时，光信号将被转换成电信号并传输到电脑中，通过专用App对这些信号进行处理，就会准确地得到粒度分布了。

In order to measure the intensity of scattered light in different angles, laser particle size analyzer (www.jnwinner.com) needs to employ optical means to deal with scattered light. We placed a Fourier lens in the light in the proper position, placing a set of multiple photo detectors in the focal plane of the Fourier lens, the light scattering from different angles by means of Fourier lens on the multiple photoelectric detector, optical signal will be converted into electrical signals and transmitted to the computer. These signals are processed by special software, get the accurate size distribution.

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