An instrument for measuring or registering the amount of cloudiness.
An instrument which measures the degree to which liquid suspensions scatter light, and by inference, the concentration of scattering particles in the suspension. It is used for various purposes, such as to estimate the number of bacteria in suspension in a liquid.
Any apparatus used to measure the size and concentration of particles in a liquid by analysis of light transmitted through or reflected by the liquid.
An instrument used to measure the scattering coefficient of an air sample caused by suspended particles. The measurement can be used to determine the visual range through the medium.
Device used for measuring low turbidity water with the test results expressed in Nephelometeric Turbidity Units (NTU).
Particulate detectors which use the principle of back-scattering of light from a calibrated source by the particulates present within a sensing chamber to determine particulate concentrations.
An instrument which measures the scattering function of particles suspended in a medium in order to determine the visual range through the medium. See visibility meter.
an instrument that measures the amount of light scattered.
1. General name for instruments that measure, at more than one angle, the scattering function of particles suspended in a medium. Information obtained from such instruments may be used to determine the size of the suspended particles and the visual range through the medium. 2. Same as nephometer. Middleton, W. E. K., 1952: Vision through the Atmosphere, 200–212.
An instrument that uses measurements of scatterred light from a laser beam to detect and study cloud particles.
An instrument for measuring turbidity in water using a photometric analytical technique for measuring the light scattered by finely divided turbidity or colloidally dispersed particles suspended in water.
1. General name for instruments which measure, at more than one angle, the scattering function of particles suspended in a medium. Information obtained from such instruments may be used to determine the size of the suspended particles an the visual range through the medium. 2. An instrument for chemical analysis by measuring the light-scattering properties of a suspension. nephometer. See visibility meter.
A nephelometer Nephelometer comes from the Greek word for cloud, nephos, cf. "nepheloid layer". is an instrument for measuring suspended particulates in a liquid or gas colloid. It does so by employing a light beam (source beam) and a light detector set to one side (usually 90°) of the source beam. Particle density is then a function of the light reflected into the detector from the particles.