| 摘要 |
PURPOSE:To improve measurement accuracy by detecting simultaneously the scattered light in plural directions by plural detecting means and determining power spectral density in the stage of measuring immune reaction by making use of the intensity fluctuation of scattered light by fine particles. CONSTITUTION:The immune reaction based on an antigen-antibody reaction is measured by making use of the intensity fluctuation of the scattered light by fine particles. A laser beam 2 from a light source 1 is made into a beam 4 by a semi-transparent mirror 3 in this stage. Said beam is condensed by a condenser lens 6 and is projected to a cell 7 in which the antigen-antibody reactive liquid contg. the fine particles 9 is contained. The scattered light thereof is detected simultaneously from two directions by collimators 10, 11 and is made incident on photodetectors 12, 13. The outputs thereof are supplied respec tively via low-pass filters 17, 19 to a data processing unit 15, by which the average value is determined. The influence of noise, etc. is thus eliminated and the measurement data of high reliability is obtd. even with a sample of a low concn. |
