OPTICALLY MEASURING DEVICE.

摘要

A prism (3) is provided with an emitting surface (3a) which outputs fluorescence as a light signal transmitted through a slab waveguide (1) constituting one face of a reaction bath. An auxiliary inclined surface (3b) continuing the emitting surface (3a) and having an inclination opposite to the emitting surface (3a) is formed on the prism (3). The stray light of the fluorescence is emitted from the auxiliary surface (3b), and is prevented from entering a detector (7) which detects the fluorescence as a light signal.