| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus, capable of precisely measuring the content of a dissolved substance in liquid and conducting the measurement easily, in an in-line of a process that uses the liquid. SOLUTION: The apparatus includes an optical section 1, which brings light R1 from a light source 31 to enter the boundary surface 32b of a prism 32 forming an interface with the liquid 35 and detects a reflectivity of reflection light R2 from the prism boundary surface 32b; and a data processing section 2, which computes the dissolved substance content in the liquid 35, based on a detection signal of the optical section 1. In the data processing section 2, an absorbance (reflection intensity) is computed, on the basis of a signal corresponding to a reflection amount of reflection light R3 which is output from a light receiving element 33 and then the dissolved substance content in the sample liquid (the liquid) is computed, on the basis of the computed absorbance and calibration curve formula. COPYRIGHT: (C)2011,JPO&INPIT
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