2024年12月4日 · FNU stands for “Formazin Nephelometric Units” and also signifies that the instrument is measuring scattered light from the sample at a 90-degree angle from the incident light but in accordance with the European standard ISO 7027.

Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of both water clarity and water quality. Fluids can contain suspended solid matter consisting of particles of many different sizes.

2020年10月6日 · Both the Nephelometric Turbidity Unit (NTU) and the Formazin Nephelometric Unit (FNU) scales measure turbidity by the scattered light method. Both units calibrate the intensity of scattered light at 90 degrees from an incident beam of light.

A JTU or Jackson Turbidity Unit is a historical unit used when measurements were made visually using a Jackson Candle Turbidimeter. Water was poured into a tube until a flame underneath the tube could no longer be distinguished. The turbidity units NTU, FNU, FTU, AND FAU are all based on calibrations using the same formazin primary standards.

在光学、水处理等领域中，液体的浊度是一个重要的参数，它用来度量液体中颗粒物的浓度。 根据ISO国际标准，浊度的单位一般使用NTU和FNU。 NTU是Nephelometric Turbidity Unit（涡流浊度单位）的缩写，而FNU是Formazine Nephelometric Unit（浊度计定标法）的缩写。

2021年4月12日 · Turbidity is defined as the degree to which light is scattered by particles suspended in a liquid. The measured turbidity depends on the wavelength of light and the angle at which the detector is positioned. In this post I want to explain the different turbidity units of measure: NTU, FNU, FTU, FAU, and JTU.

Turbidity is caused by particles and colored material in water. It can be measured relative to water clarity or with a turbidity sensor or turbidimeter.

Technically speaking, NTU is a unit of measure that is best used to represent turbidity readings captured using a white light at a 90 degree detection angle and FNU is best used when the data is measured using an 860 nm light (near IR) with a 90 degree detection angle (ISO7027 compliant).

Turbidity can be expressed in NTU, in FNU (=1.5*NTU) or in FAU when it is a water sample. The turbidity of a water sample is generally between 0 and 400 NTU and between 40 and 4000 FAU. What is the point of measuring turbidity? Particles suspended in a fluid interact with light by reflection, scattering and even absorption.

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