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Comparison of techniques for overcoming scattering in spectroscopy

Light scattering provides a problem in optical spectroscopy as the relationship between attenuation and absorption in the presence of scattering is non-linear. Three simple methods of reducing the effects of scattering are considered in this paper, namely; polarization subtraction, use of an added absorber and spatial filtering. There is an inevitable trade-off between the accuracy of the measurement and the signal to noise ratio as scattered light is rejected from the detector. It is demonstrated that polarization subtraction provides the optimum performance as it enables the relationship between attenuation and absorption coefficient to become more linear at a higher signal to noise ratio than both use of an added absorber and spatial filtering over a range of scattering coefficients.