How does a turbidity sensor work?

Suspended solids and colloids such as soil, dust, fine organic matter, zooplankton and other microorganisms in the water can cause turbidity in the water. Yushan Sensing Turbidity Sensor uses the principle of 90° scattered light. When the parallel light beam emitted by the light source passes through the solution, part of it is absorbed and scattered, and the other part passes through the solution. The intensity of scattered light in the direction of 90° to the incident light conforms to Rayleigh's formula: where: under the condition of constant incident light, within a certain range of turbidity, the intensity of scattered light is proportional to the turbidity of the solution. The above formula can be expressed as: According to this formula, the turbidity of the water sample can be measured by measuring the scattered light intensity of the particles in the water sample.