Handheld turbidity meter is an important tool for measuring liquid turbidity, which mainly uses scattered light (90 °), transmitted light, and backscattering principles to quantify turbidity.
90 ° scattered light principle
When light shines on suspended particles in a liquid, scattering occurs. Measuring scattered light intensity in the 90 ° direction is a commonly used method. The more suspended particles in a liquid, the stronger the scattering effect on light, and the greater the intensity of scattered light received in the 90 ° direction. The built-in light source of the handheld turbidity meter emits light of a specific wavelength, which illuminates the liquid to be measured. The photodetector at a 90 ° position receives the scattered light and converts it into an electrical signal. By establishing a standard curve of scattered light intensity and turbidity in advance, the instrument can convert electrical signals into corresponding turbidity values.
Principle of transmitted light
Transmitting light refers to the remaining intensity of light after passing through a liquid. Suspended particles in turbid liquids absorb and scatter some light, resulting in a decrease in transmitted light intensity. The higher the turbidity, the lower the transmitted light intensity. Handheld turbidity meter allows light to pass through the liquid to be tested, and the transmitted light intensity is measured by a photodetector on the other side. Quantify turbidity based on the pre calibrated relationship between transmitted light intensity and turbidity.
Backscatter principle
Backscatter refers to the light that is scattered back towards the direction of the light source after being irradiated by particles. In some special cases, backscattering can also be used for turbidity measurement. The principle is similar to 90 ° scattered light, where the more particles there are, the stronger the backscattered light. The handheld turbidity meter receives backscattered light through a specific design, and converts it into turbidity values using corresponding algorithms and standard curves.
Handheld turbidity meters comprehensively utilize these optical principles to quickly and accurately measure liquid turbidity, and are widely used in water quality monitoring, industrial production, and other fields.