![]() Our LISST-Portable |XR has 44 size classes that reach down to about 0.3 micron at the low end of sizes. Note that our new LISST-200X has 36 detectors and 36 size classes spanning a wider size range of particles the original LISST-100X had 32. light on rings with filtered water), an inversion procedure produces the 32-element PSD. Following this de-attenuation, and after then subtracting a background (i.e. This attenuation is used only to de-attenuate the light on rings. ![]() A reduction in this power due to particles constitutes a measure of attenuation. The photodiode P senses the power in this beam. A hole in the center of the ring detector (D) allows the tightly focused laser beam to pass through. Behind the ring detector is placed a photodiode (P). These are the primary measurements constituting the data. Each ring detects scattering into a very specific small range of angles. This array consists of 32 rings of silicon. Behind the lens, at its focal plane is placed a special detector array (D). A receiving lens (R) collects the scattered light. Particles in water (at arrow) scatter light. The figure below shows how that is done.Ī laser (L) is collimated. In the laser diffraction method, these measurements are of light scattering into 32 angles. In order to get 32 pieces of information, one needs 32 independent measurements. For example, a 32-element PSD means that the total concentration is divided into 32 size fractions. Particle Size Distribution (PSD) is a multi-parameter description of how the total concentration of particles is distributed into many size fractions. For detailed explanations see articles: Laser Diffraction-101 and -201.
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