CONCENTRATION MEASURING DEVICE

• Main Authors: NISHINO KOJI, NAGASE MASAAKI, YAKUSHIJIN TADAYUKI, IKEDA NOBUKAZU, HIRAO YOSHIYUKI, YAMAJI MICHIO, TANAKA KAZUTERU
• Format: Patent
• Language: English; Japanese
• Published: 02.11.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To provide a concentration measuring device with improved measurement accuracy.SOLUTION: The concentration measuring device comprises a measurement cell 4, a light source 1, a photodetector 7, and an arithmetic portion 8 for calculating absorbance and concentration of a fluid to be measured on the basis of an output of the photodetector. The measurement cell includes a cell body, a window portion fixed to the cell body so as to contact a flow path, and a reflective member disposed opposite to the window portion across the flow path. The window portion is fixed to the cell body by a window holding member via a gasket. A surface of the window portion is arranged so as to be inclined at an inclination angle of 1° or greater and 5° or less with respect to a surface orthogonal to the central axis of the flow path. The window holding member is formed so that a lower surface for pressing the window portion is non-parallel to an upper surface facing the lower surface. A collimator is fixed on the upper surface of the window holding member so that the central axis of the collimator connected to the light source is parallel to the central axis of the flow path.SELECTED DRAWING: Figure 2 【課題】 測定精度が向上した濃度測定装置を提供する。【解決手段】 測定セル４と、光源１と、光検出器７と、光検出器の出力に基づいて被測定流体の吸光度および濃度を演算する演算部８とを有し、測定セルは、セル本体と、流路に接するようにセル本体に固定される窓部と、流路を挟んで窓部に対向配置された反射部材とを有し、窓部は、セル本体に、ガスケットを介して窓押さえ部材によって固定されており、窓部の面は、流路の中心軸に直交する面に対して、１°以上５°以下の傾斜角で傾くように配置されており、窓押さえ部材は、窓部を押さえる下面と、下面と対向する上面とが非平行に形成されており、光源に接続されたコリメータの中心軸が流路の中心軸と平行になるように窓押さえ部材の上面にコリメータが固定されている。【選択図】図２