OPTICAL CONCENTRATION TRANSDUCERS FOR TURBIDITY MEASUREMENT

Abstract

. Turbidity instrumentation is used in many industries to measure the presence or concentration of particles should be thought of as undissolved solids, liquids, or gases having a different refractive index than that of the carrier liquid streams. Other terms used besides turbidity are clarity, haze and transparency. They are all nontechnical descriptors and they describe the effect a sample, including suspended particles, has on light passing through it. Turbidity is most often used to describe the measurement of low concentrations of particles (< 1% v/v) that should not be in the process stream, like particles in drinking water or filtrate. Turbidimeters measure the scattering of light by particles at these concentrations and correlate it to particle concentration. A basic understanding of the principles of light scattering and the methods used to measure it will help in selecting and specifying the instrument needed for the required measurement