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Spectrometer system determines scattering and absorption coefficients of turbid media

17 September 2020 | Product
by Ian Michael

Gigahertz-Optik’s SphereSpectro 150H spectrometer system enables the simultaneous determination of the spectral absorption and scattering coefficients for scattering samples. The sample is illuminated and the transmitted as well as the reflected light is measured and evaluated in a differentiated manner using radiative transfer theory. For clear samples, the absorption coefficient is determined based on Beer–Lambert’s law. However, if the sample exhibits scattering (i.e. turbid or translucent samples), the entire physical process must be taken into account, i.e. a combination of scattering and absorption properties.

The determined absorption coefficient is identical to the absorption coefficient determined conventionally for clear media and can be used for content determinations, for example. The SphereSpectro 150H uses an integrating sphere to measure the total reflected and transmitted light of an illuminated sample. From these two quantities, the absorption coefficient and the effective scattering coefficient can be calculated.

The SphereSpectro 150H covers the wavelength range between 200 nm and 2150 nm. Modular versions are also available for sub-ranges within this spectral range. The spectrometer also benefits from simple operation, short measurement times and a large sample chamber with optimised sample holder.

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