METHOD OF PHOTOMETRIC MEASUREMENT

摘要

A method of photometric measurement of the light absorption ot the contents (12a) of a cuvette (12) is disclosed which includes taking a series of readings of the light absorption as the cuvette (12) moves at a predetermined rate through the path of a beam of light (22) directed onto a light detector (30). The time intervals between the readings is fixed as a function of the width of the cuvette (12), the predetermined rate of movement of the cuverte (12) through the light path (22), and a desired number of readings. An initial reading of the light absorption in the light path (22), is made before the cuvette (12) enters the light path (22) and the difference between this initial reading a subsequent readings is obtained. The difference is compared with a predetermined limit until the difference ecxeeds or is equal to the predetermined limit, indicating the arrival of a predetermined portion of the cuvette (12). Further readings are taken up to the desired number of readings corresponding to the passage of the predetermined portion of the cuvette (12), and a measurement of light absorption corresponding to a desired part of the predetermined portion of the cuvette (12) is selected.