Oil concentration measuring apparatus and oil concentration measuring method

摘要

Provided is an oil concentration measuring device and method that can measure the concentration of oil over a wide concentration range, and can be applied to the continuous measurement of oil concentration. For a liquid to be measured containing a known oil component, an absorbance spectrum in a predetermined wavelength band where light absorption is observed is measured (S2, S3). If the predetermined standard is satisfied, the predetermined spectrum in the predetermined wavelength band is measured. Obtain the oil concentration value based on the absorbance at the wavelength and the first calibration curve indicating the relationship between the concentration of the component and the absorbance at the predetermined wavelength (S4, S51). Based on the wavelength at which the absorbance becomes a predetermined absorbance in the absorbance spectrum in the predetermined wavelength band, and the second calibration curve indicating the relationship between the concentration of the component and the wavelength at the predetermined absorbance, the concentration value of the oil is determined. Obtain (S4, S52).