An apparatus for use in quantitative analysis of a turbid pharmaceutical sample (57), comprising: means (52) for generating an excitation beam (53) of radiation; means (50) for intensity modulating said excitation beam (53); means (54, 55, 56) for focusing said excitation beam (53) onto said sample (57); and means (58) for detecting all wavelengths simultaneously. Characterized in that said means (54, 55, 56) for focusing are parts of a Fourier spectrometer.
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