There is presented a multipoint measurement system comprising light sources (1, 2); a plurality of illuminating fibers (5, 6) for transmitting light from the light sources to a sample so as to illuminate a plurality of points of the sample (A, B); a plurality of receiving fibers (8, 9) for collecting light beams including transmitted, reflected, scattered light beams at the plurality of points; a beam selector (10) which comprises a rotatable disk (12) having an aperture for transmitting a light beam collected by one of the plurality of receiving fibers (8, 9) through the receiving fiber (11); and an MCPD (4). When the rotatable disk (12) is rotated so that the aperture is displaced to and stops at a position at which light at the desired channel passes through, it is possible to perform measurement only on the light passing through the corresponding receiving fiber (8, 9, 11). Light at any other channel may be measured by rotating the rotatable disk (12) by a predetermined angle.
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