| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
For an optical fiber current sensor utilizing very small birefringent glass having zero photoelastic constant (PEC) is essential to keep very low levels of the noise due to photoelastic effect. Since a rotation angle of linearly polarized light propagated in the fiber is in proportion to a magnetic field strength generated by a current. To date, high PbO containing silicate glass fiber is realized for the fiber typed current sensor. However, other glasses made by Pb-free composition should be found from a point view of environmental friendly materials.
We have developed very small birefringent zinc tin borophosphate glasses. The boro-phosphate composition line without Pb provides both very low PEC and improved water durability. Some glass compositions with nearly zero PEC (less than |0.01 × 10-12| Pa-1) are obtained. The structure revealed by micro-Raman and MAS-NMR spectroscopies and the possibility to make an optical fiber using the zero PEC composition are studied.
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