Abstract:
The optical property expressed as turbidity is the interaction between light and suspended particles in water. A directed beam of light remains relatively undisturbed when transmitted through absolutely pure water, but even the molecules in a pure fluid will scatter light to a certain degree. Therefore, no solution will have a zero turbidity. In samples containing suspended solids, the manner in which the sample interferes with light transmittance is related to the size, shape and composition of the particles in the solution and to the wavelength (color) of the incident light.
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Details:
System hardware consists of a laser that emits a light of constant intensity. This light travels a small distance through medium and reaches light dependent resistor (LDR) on other end. LDR resistance depends on amount of light reaching LDR. This setup is immersed inside the solution whose turbidity is to be measured.