The method involves first performing detection measurements with which light is beamed as primary light through the boundary surface (5) of the matrix at an irradiation point (12). The light then emerging from the scattering matrix through the surface is detected at a detection point (13) located at a predetermined measurement distance from the irradiation point as secondary light. The measurable physical properties of the secondary light is determined as a measurement parameter, as a measure of the analytical data to be measured, from the interaction of the light with the scattering matrix. In the detection procedure at least two measurements are taken for different reflection conditions at the boundary surface between the irradiation point and the detection point from which a value is obtained for the measurement parameter.
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