Optical measurement device and optical measurement method

An optical measurement device for measuring optical characteristics of a measurement target object, the optical measurement device comprising:

• an irradiation optical system configured to irradiate an irradiation target with irradiation light;
• a photodetection unit configured to detect detection light caused by the irradiation light;
• and
• a signal processing unit,
• wherein a fluorescence detection process and a preliminary process to be performed before the fluorescence detection process are performed,
• wherein, in the fluorescence detection process,
• the irradiation optical system designates the measurement target object as the irradiation target and irradiates the measurement target object with the irradiation light,
• the photodetection unit detects measurement target light as the detection light, the measurement target light including fluorescence generated from the measurement target object irradiated with the irradiation light and light scattered from the measurement target object irradiated with the irradiation light, and
• the signal processing unit removes a signal component corresponding to the scattered light in a calibration process during the preliminary process from a measurement signal corresponding to the measurement target light, and
• wherein, in the preliminary process, the signal processing unit performs the calibration process for removing the signal component corresponding to the scattered light from the measurement signal on the basis of a calibration signal, which is a signal related to the irradiation light or the scattered light associated with the irradiation light detected in the photodetection unit and has a higher signal intensity than a signal corresponding to the scattered light in the measurement signal.