SPECTROPHOTOMETRIC ANALYSIS

摘要

A method of and apparatus for spectrophotometrically analysing a tablet by NIR transmission measurements includes a tablet holder 1 having a recess 5 within which a tablet 20 is located. A probe 40 is applied to the tablet 20 to direct an NIR beam 45 to and through the tablet for sensing at a detector 32 from which measurements characteristics of the tablet are analysed. The recess 5 accommodates the tablet 20 as a close, possibly complementary fit. The tablet is clamped in the recess 5 by a spring loaded rod 8 to ensure that the tablet is located and retained at a predetermined position in the recess 5 relative to an aperture 7 through which the transmitted beam is directed to the detector 32. Preferably the tablet 20 is subjected to clamping forces applied by two spring loaded clamping rods disposed substantially perpendicularly relative to each other in the tablet holder. The effect of clamping the tablet in the tablet holder permits reproducible analysis measurements to be achieved from which may be determined the acceptability or otherwise of the characteristics of tablets as manufactured commercially. The invention also provides for the structure of a tablet holder.