Cuvette for photometric measurements on liquids

摘要

The cuvette holds the sample which is then exposed to light from a stationary source. The cuvette has at least two regions of different cross-section. The cuvette is moved along a curved path continuously so that the light beam passes through at least two regions during photometric measurement. - The light beam travels in a horizontal plane. The long axis of the cuvette is perpendicular to this plane. Alternatively, as the cuvette moves, its long axis lies in a horizontal plane and the light beam is perpendicular to this plane. The regions of the cuvette used for photometric measurement extend between the surface of the sample in the cuvette and the stepped bottom of the cuvette. (1/4) EPAB- EP-113118 B An apparatus for the photometric examination of a liquid specimen or sample, the apparatus comprising the following parts: A stationary light source (26) for the photometric measurement; a dish (11; 31; 41) adapted to receive the sample and having an elongated inner chamber with a longitudinal axis (Y-Y) and at least one flat optically permeable wall (46, 47) which bounds the inner chamber and through which the light beam passes; and a rotatable dish holder (29) on which one or more dishes are disposed for movement along a circular path, characterised in that the dish interior has at one of its ends and distributed over its width at least two adjacent zones (12, 12; 34, 35; 44, 45) of different internal cross-sections, the internal cross-section varying stepwise from one zone to the adjacent zone; the wall is of the same thickness in both zones and the dish is so movable transversely to the direction of the light beam that at least two of the zones are passed through seriatim by the light beam during the movement of the dish. - (8pp) USAB- US4648713 A The method involves introducing the sample to be analysed into - a cuvette, which is provided with at least two regions defined by the shape of the cuvette. The regions have different cross-sectional lengths for receiving the sample. The cuvette is continuously moved along a circular path and a light beam generated by an immobile light source is passed along a path which crosses the circular path. During the cuvette's circular movement, the light beam passes through the sample contained in the two regions in succession. - The sample is analysed photometrically, so that the analysis of the sample is effected on those portions of the sample which have different thicknesses by reason of being received in the two regions.