| 摘要 |
PROBLEM TO BE SOLVED: To provide a concentration measuring device with high accuracy.SOLUTION: A concentration measuring device includes: a twin-cell in which a measurement cell and a reference cell are provided adjacent to each other; an incidence connector for making light emitted from a first light guide member for guiding light source light to enter the measurement cell or the reference cell; an emission connector for receiving light that transmits the measurement cell or the reference cell so as to be allowed to enter a second light guide member; a moving device for moving the incidence connector and the emission connector as a pair along a direction connecting the measurement cell and the reference cell, and switching an optical path arriving at the second light guide member from the first light guide member between the first optical path transmitting the measurement cell and the second optical path transmitting the reference cell; a light reception part for obtaining a signal by receiving light from the second light guide member; and a calculation part for recording a calibration curve showing a relationship between the signal and the concentration of each component, recording a compensation amount owing to a difference between the first optical path and the second optical path, and, for liquid including the component in which concentration is measured, calculating the concentration of each component by compensating a concentration obtained by the calibration curve based on the compensation amount. |
