Errors in performing optical measurements of scattering samples are analyzed. Measurements are described from a Perkin-Elmer Lambda-9 spectrophotometer with an integrating sphere of 15 cm diameter for spectral data between 300 and 2500 nm and from a 65 cm integrating sphere for broadband data on larger samples. The influence of the size of the illuminated sample area, the size of the sphere ports and sample thickness are investigated. Results are compared with Monte Carlo simulations.
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