| 摘要 |
PURPOSE:To improve an explosion-proof property, and also to execute a remote sensing by detecting the output light of one optical waveguide which is varied in accordance with the difference of a liquid refractive index of the optical waveguide having a prescribed gap filled with the liquid to be measured. CONSTITUTION:A liquid refractive index sensor head 1 is provided with a main optical waveguide and a sub-optical waveguide 3 and 4, and 3 and having prescribed gaps 6, 7, respectively. When this head 1 is immersed into the liquid to be measured and the gaps 6, 7 are filled with the liquid, and also light is made incident on the waveguide 3 through an optical fiber 8, light which is varied in accordance with a refractive index of the liquid is emitted from the waveguide 3 because the degree of coupling of the waveguides 3 and 4, and 3 and 5 are different in accordance with the refractive index. Subsequently, the emitted light from the waveguide 3 is detected remotely through an optical fiber 9 and the refractive index is measured. In such a way, an explosion-proof property of the liquid refractive index sensor head is improved, and also a remote sensing of the refractive index is executed. |
