| 摘要 |
An analyzer for relative (percent etc.) measurement of amounts of certain substances, especially protein, water and/or oil in powdered, pulp-like or other non-rigid foodstuffs, is made to alternatingly irradiate a sample and a reference with collimated monochromatic IR-light. Both the sample and the reference are irradiated several times with light of various wavelengths in sequence. Photocells in an open spherical chamber, a so-called Ulbricht ball, receive from the sample and from the reference reflected diffuse light and convert it to electrical signals. In the beam path there is a window which allows said wavelengths to pass and which is in direct contact with the sample, which is thus not provided with a casing or own covering glass or the like. The sample is placed in a sample holder, which is formed by the window, possibly with a wall portion around said window, and a wall directly opposite to the window. The sample holder is completely closed when used but has an opening at one edge and a fixed or spring-biased bottom on the opposite edge. Between the wall and the window there is thus a space for filling with the sample through the opening in a direction transverse to the axis of the window. Said wall, and the frame of the analyzer itself with the window, can be separated from each other, so that said space is completely opened, and can be "flour-tight"0 sealed against each other. The analyzer can thus be used in such a position that the light beam is horizontal and strikes a vertical surface on the sample at a right angle. |
