Spectrophotometers and colorimeters

摘要

A zoom lens (40) is provided between a sample (2) and a slit (12) of a spectrophotometer to change the size of the image of the sample on the slit plane. A picture of the sample is taken by the zoom lens (40) and is shown on a display screen (33), on which a window is superimposed. When an operator changes the location of the window, the sample (2) is moved accordingly and, when the operator changes the size of the window, the focal length of the zoom lens (40) is changed, whereby the size of the measurement area is changed. By changing the size of the measurement area on the slit plane while the size of elementary photo-sensors of a photo-detector (17) is unchanged, the resolution of two-dimensional spectrophotometry can be changed.