direction which are likely to affect the accuracy of the measurement resulting in improvement in the accuracy and speed of measurement as a driving system used for making measurements for the areas on the substrate the method and device require a driving system for rotating the substrate if measurements cannot be made for all the measuring areas by the use of the rotational movement of the substrate alone an additional driving system for changing the radial length from the center of the rotation to the measuring portion is optionally installed so as to enable the measurements for all the measuring areas from the standpoint of easy rotation the substrate is desirably a special substrate which incorporates a central axis of rotation as a constituent so that the rotational driving of the axis can be directly transmitted thereto like data disks commonly used in daily life however if it is impossible to prepare such a substrate the substrate may be rotated using a holder on which it is fixed when the central axis of rotation cannot be incorporated in the substrate plane for the reasons related to measurement the substrate may be rotated around the central axis established outside it while being fixed on the holder generally it is often easier to move the substrate than to move the measuring portions because of the structure of the devices however in cases where the substrate is difficult to rotate a driving system may be used which does not rotate the substrate but rotates mainly the measuring portions in cases where measurements need to be made for multiple items such as absorption and fluorescence the.