| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical detection device that can suppress degradation of fiber optics.SOLUTION: An optical detection device 3 comprises: an annular diaphragm part 3a that shields light L11 to stop down the light L1 heading for a fiber optic 11; and a detection unit 32 that detects at least a part of the light L11 to be incident upon the diaphragm part 3a. The diaphragm part is formed so that an angle θ1 of incidence of light L12 to be incident upon the fiber optic after stopped down is smaller than a maximum angle θMAX of light reception for totally reflecting the light to be incident upon the fiber optic in a core 11a of the fiber optic. And, the optical detection device further comprises a computation unit 33b that computes an amount of light to be incident upon the fiber optic on the basis of an amount of light to be detected by the detection unit.SELECTED DRAWING: Figure 3 |
