| abstract |
PROBLEM TO BE SOLVED: To provide a capsule type optical sensor that is small and can detect a plurality of near-infrared fluorescence. A capsule-type optical sensor including an illuminating unit and a detecting unit, wherein the illuminating unit includes light emitting elements 2 and 3 that generate light having an arbitrary narrow wavelength band belonging to a range of 600 to 2000 nm. Has a photoelectric conversion element 7 and a tunable filter disposed in front of the light receiving surface of the photoelectric conversion element 7. [Selection] Figure 1 |