| 摘要 |
PURPOSE:To find a refractive index by peeling part of the clad of a waveguide which has core/clad waveguide structure, and bringing some material into contact with the part and measuring variation in the quantity of waveguide light. CONSTITUTION:A fixed base 1 is cubic and a groove part 5 where an optical fiber 2 is embedded is formed arcuately. The optical fiber 2 is curved arcuately and fixed along this groove part 5, and a projecting clad 4 is ground away to expose a core 3, thus forming a ground surface 6. A light source 7 and a processing part 8 are connected mutually by an optical fiber 10 and measurement light is guided to a refractive index measuring sensor 9. Liquid whose refractive index is already known is brought into contact with the ground surface 6 and the correlation of the quantity of variation of waveguide light to variation in the refractive index is stored in the processing part 8. Then a body to be measured whose refractive index is unknown is made contact the refractive index measuring sensor 9 and the processing part 8 calculates the refractive index of the body to be measured from the quantity of variation of the waveguide light. |
