A nephelometer is an analytical instrument used to measure the concentration of suspended particles in a fluid by determining the amount of light scattered by those particles. The basic principle behind a nephelometer involves passing a beam of light—typically from a laser or other light source—through a sample. When the light interacts with suspended particles in the sample, it scatters at various angles. The amount of light scattered at a specific angle (usually 90 degrees) is measured by a detector.
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