Colorimetric absorbance measurement apparatus

摘要

In a colorimetric absorbance measurement apparatus (1), a filter assembly (10) on which a plurality of filters (11) are arranged in a circular pattern is continuously rotated by a motor (4) at a regular speed based on a motor drive signal fed from a motor drive circuit. Each of the filters (11) is arranged to pass only such light components that have wavelengths falling within a range centering on a specific wavelength. The motor drive signal produced by the motor drive circuit (5) is also fed into a timing generator circuit (8). The timing generator circuit supplies an A/D conversion start signal to an A/D converter (7) in synchronism with the timing at which a selected one of the multiple filters is positioned on the optical axis of a measuring light beam.