Abstract: An irradiation optical system configured to irradiate an object with first light includes: a light source including a surface emitting element emitting the first light from a light emitting surface; a light shaping member on which the first light emitted from the light source is incident via a light incidence surface and which shapes the incident first light using a light passing hole and emits the shaped first light; and a first lens configured to form an image of the first light emitted from the light shaping member on the object. A distance between the light emitting surface of the surface emitting element and the light incidence surface of the light shaping member is equal to or less than 26 times a size.

Abstract: An optical measurement device includes an irradiation optical system, a detection optical system, and a cancel circuit. In a fluorescence detection process, a sample is designated as an irradiation target, the sample is irradiated with irradiation light, measurement target light including fluorescence generated from the sample irradiated with the irradiation light and light scattered from the sample irradiated with the irradiation light is detected as detection light, a signal component corresponding to the scattered light is removed from a measurement signal corresponding to the measurement target light in consideration of a result of performing a calibration process during a preliminary process. In the preliminary process, the calibration process for removing a signal component corresponding to the scattered light from the measurement signal is performed on the basis of a calibration signal having a higher signal intensity than a signal corresponding to the scattered light in the measurement signal.

Abstract: In an optical measurement device, in a first process, a reference member is irradiated with excitation light, light for a calibration process including scattered light associated with the excitation light from a reference member is detected as detection light, a calibration signal corresponding to the light for the calibration process is designated as a detection signal, and a calibration process for removing a signal component corresponding to the scattered light from the detection signal in a second process is performed. Also, in the optical measurement device, in the second process, a sample is irradiated with the excitation light, measurement target light including fluorescence generated from the sample and light scattered from the sample irradiated with the excitation light is detected as detection light, and a signal component corresponding to the scattered light from a measurement signal.

Abstract: An optical measurement device includes a light detection element for detecting detection light including fluorescence generated from an immuno-chromatography test piece irradiated with excitation light and scattered light caused by the excitation light and having a phase equivalent to that of the excitation light, and a cancel circuit for processing a detection signal corresponding to the detection light. The cancel circuit removes a signal component corresponding to the scattered light from the detection signal on the basis of a phase difference between the fluorescence and the scattered light.