| 摘要 |
PURPOSE:To improve measurement accuracy by removing the frequency component higher than the relaxation frequency of powder 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 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 made incident through a collimator 10 on a photodetector 11 and the output thereof is supplied via a low-pass filter 16 which removes the frequency component substantially higher than the relaxation frequency of the detected power spectral density to a data processing unit 14. The measurement with high accuracy is thus made possible without being affected by noise, etc. even if the particle concn. and the quantity of the measuring light are low. |
