| 摘要 |
PROBLEM TO BE SOLVED: To provide a concentration measurement apparatus capable of accurately measuring concentrations of a measurement object.SOLUTION: A concentration measurement apparatus includes: a laser light source 22 for generating a laser beam as excitation light 23; a probe light generation unit 24 for generating, due to wavelength conversion of the excitation light 23, probe light beams 10 and 12 having an ON wavelength and an OFF wavelength for a measurement object S; an optical path branching unit 27 for branching a part of the probe light beams 10 and 12 as intensity reference light 15; a photodetector 26 for receiving the intensity reference light 15 and the probe light beams 10 and 12 which are transmitted by the measurement object S or reflected by the measurement object S on the same light receiving surface; and a concentration calculation unit 28 for specifying the probe light beams 10 and 12 on the basis of a difference between respective times at which the intensity reference light 15 and the probe light beams 10 and 12 arrive at the detector 26, and for calculating a concentration of the measurement object S on the basis of the intensity of the probe light beams 10 and 12. |
