| 摘要 |
<p>PURPOSE:To obtain an optical fiber sensor excellent in linearity, reproducibility and stability by allowing a detecting body whose coefficient of thermal expansion is larger than that of clad to closely adhere to the outer circumferential surface of multi core optical fiber. CONSTITUTION:A detection tube 4 is allowed to closely adhere to the outer circumference of the multi core optical fiber 3. The detection tube 4 is formed of the material whose coefficient of thermal expansion is larger than that of the clad 1 of the multi core optical fiber 3. When the circumferential temperature of the optical fiber sensor rises, the multi core optical fiber 3 is stretched to be always straight because of the large coefficient of expansion of the detection tube 4. Then, the multi core optical fiber 3 is not bent even if the temperature changes. The detection tube 4 is allowed to closely adhere to the clad 1 with epoxy-based adhesive 7. With such a constitution the optical fiber sensor whose characteristic is excellent in the linearity, reproducibility and stability is obtained.</p> |
