| 摘要 |
1281952 Photo-metric analysis of fluids E I DU PONT DE NEMOURS & CO 14 Aug 1969 [16 Aug 1968] 40671/69 Heading G1A [Also in Division G2] In an apparatus for the photo-metric analysis of a sample fluid contained in a deformable container 15, this container is formed into a sample cell containing the majority of the sample fluid by means B, so that the sample cell has a predetermined optical path length and a flat optical surface at each end thereof, the radiation from a source 29 such as a quartz iodine lamp which passes through the liquid being measured by a photo-cell 28. The container may be a straightforward sack with an opening at the top, Fig.1 (not shown) or may be of the kind shown in Fig. 2 comprising a transparent deformable pouch 15 and a non-deformable header 16. Liquid is introduced into the container through openings 19 and 20, alternatively opening 21 may be used so that the liquid flows through a separation column 22 before entering the pouch. Dimples 24-27 contain various reagents that may be mixed with the sample by rupturing the appropriate dimples. In use, jaws 37, 38 are closed, thereby sealing off the container by means of a sealing bar 41 and forcing the container into the shape of the cellforming region 42, excess fluid being forced into the relief chamber 43 along a channel 44. As the jaws are closing contact fluid, e.g. water is sprayed on the interface between the quartz windows 39, 40, thus filling any small cavities in the surface of the container. The filter wheel 34 contains a number of filters having different pass bands, and the light source intensity is maintained constant by feeding back the output from a regulating photo-cell 36 to the lamp power supply. A voltage clamping circuit is provided to limit the lamp supply voltage should the photo-cell 36 become obscured. Visual identification symbols 17 and identification marks 18 are provided on the header, these latter, marks being illuminated by a lamp 46 and read by an array of photo-diodes (not shown). A number of transparent deformable materials are specified for the pouch 15. |
