公开(公告)号：JPS63163258A

公开(公告)日：1988-07-06

申请号：JP31295786

申请日：1986-12-26

Applicant: TOA ELECTRONICS

Inventor： KUSHISHITAMACHI RYUSUKE ,  AKASAKA KINICHI

IPC: G01N21/49 ,  G01N21/15

Abstract: PURPOSE:To eliminate the influence of an air bubble which enters sample liquid inevitably and to take a measurement stably at all times by blowing air to a light-irradiated area on the surface of the sample liquid through the opening of a flow cell. CONSTITUTION:A light confinement path 6 is formed in the flow cell 1 by extending an internal wall part corresponding to the path of light externally and cylindrically. An air blowing nozzle 9 of about 2mm in diameter is fitted at height of about 5cm from the liquid surface of the sample water 3 above the flow cell 1 and on the opposite side from a light emitting device 7. Further, the angle theta between the air blowing nozzle 9 and sample water 3 is set to about 35 deg.. Further, an air pump 10 is connected to the air blowing nozzle 9 and an air pressure governor choke 11 is provided between the both. Then when a measurement is taken, air is blown to the liquid surface part of the sample water 3 where light is projected from the nozzle 9, so even if there is an air bubble in the sample water, it is moved to a peripheral side and never reaches the light irradiated area. Therefore, there is no scatter by an air bubble and the measurement is performed stably at all times.