| Summary: | 碩士 === 國立屏東科技大學 === 生物機電工程系所 === 99 === This study puts eyes on the CO2 laser stripping the part cladding of silica based optic fiber of core diameter 400 μm, making it the ability to sensing refractive index of the surrounding environment. However, in the machining process unsuitable treatments, it can be introduced some defects in optic fiber sensors. Therefore, optic fiber sensors fabricated by the CO2 laser machining should carry out a series of the quality analysis in order to investigate the consequences.
The result showed that size analysis of the fiber core after machining can be used in defect detection preliminary, and optical transmission defects qualitative analysis can help to observe the defect which the size analysis hard to see the difference. In order to detect defects rising in the fabrication more precisely and quantitatively, this study introduced the tensile test and the numerical aperture measurement.
After a series of quality inspection, we suggest a better CO2 laser machining parameters: vertical scanning pathway, 4 W power, and feeding rate 9.45 cm/s. Through these better parameters, we obtain optical fiber sensors which have residue core diameter about 400 μm, no obvious optical transmission defects, numerical aperture 0.52±0.019, the 0.886 Weibull modulus, and 1.186 Weibull shaped parameter.
Finally, we use the optical fiber sensor fabricated by above better parameters to measurement the different refractive index in the solution. Results show that the refractive-index resolution of 1.8×10-4 RIU (linear fitting R2 =0.954)was achieved for sucrose solutions with refractive indices in the range of 1.333 to 1.383. We also conduct the particle plasmon resonance sensing scheme based on the fabricated optical fiber. The result provided two more information: the better sensor resolution 5.73×10-5 RIU, and the better linearity R2 = 0.99986.
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