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Fabrication quality analysis of a fiber optic refractive index sensor created by CO2 laser machining.

Chen CH, Yeh BK, Tang JL, Wu WT - Sensors (Basel) (2013)

Bottom Line: Finally, we used the optical fiber sensor fabricated using the improved parameters to measure the refractive indices of various solutions.The results show that a refractive-index resolution of 1.8 × 10(-4) RIU (linear fitting R2 = 0.954) was achieved for sucrose solutions with refractive indices ranging between 1.333 and 1.383.The results provided additional information, specifically, a superior sensor resolution of 5.73 × 10(-5) RIU, and greater linearity at R2 = 0.999.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, National Chung Cheng University, Chiayi 621, Taiwan. saesozj@yahoo.com.tw

ABSTRACT
This study investigates the CO2 laser-stripped partial cladding of silica-based optic fibers with a core diameter of 400 μm, which enables them to sense the refractive index of the surrounding environment. However, inappropriate treatments during the machining process can generate a number of defects in the optic fiber sensors. Therefore, the quality of optic fiber sensors fabricated using CO2 laser machining must be analyzed. The results show that analysis of the fiber core size after machining can provide preliminary defect detection, and qualitative analysis of the optical transmission defects can be used to identify imperfections that are difficult to observe through size analysis. To more precisely and quantitatively detect fabrication defects, we included a tensile test and numerical aperture measurements in this study. After a series of quality inspections, we proposed improvements to the existing CO2 laser machining parameters, namely, a vertical scanning pathway, 4 W of power, and a feed rate of 9.45 cm/s. Using these improved parameters, we created optical fiber sensors with a core diameter of approximately 400 μm, no obvious optical transmission defects, a numerical aperture of 0.52 ± 0.019, a 0.886 Weibull modulus, and a 1.186 Weibull-shaped parameter. Finally, we used the optical fiber sensor fabricated using the improved parameters to measure the refractive indices of various solutions. The results show that a refractive-index resolution of 1.8 × 10(-4) RIU (linear fitting R2 = 0.954) was achieved for sucrose solutions with refractive indices ranging between 1.333 and 1.383. We also adopted the particle plasmon resonance sensing scheme using the fabricated optical fibers. The results provided additional information, specifically, a superior sensor resolution of 5.73 × 10(-5) RIU, and greater linearity at R2 = 0.999.

No MeSH data available.


Related in: MedlinePlus

Schematic of optical fiber defects: (a) non-uniform changes in property; and (b) uniform changes in property.
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f6-sensors-13-04067: Schematic of optical fiber defects: (a) non-uniform changes in property; and (b) uniform changes in property.

Mentions: The surface of the fiber core is altered, as shown in Figure 6.


Fabrication quality analysis of a fiber optic refractive index sensor created by CO2 laser machining.

Chen CH, Yeh BK, Tang JL, Wu WT - Sensors (Basel) (2013)

Schematic of optical fiber defects: (a) non-uniform changes in property; and (b) uniform changes in property.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3673071&req=5

f6-sensors-13-04067: Schematic of optical fiber defects: (a) non-uniform changes in property; and (b) uniform changes in property.
Mentions: The surface of the fiber core is altered, as shown in Figure 6.

Bottom Line: Finally, we used the optical fiber sensor fabricated using the improved parameters to measure the refractive indices of various solutions.The results show that a refractive-index resolution of 1.8 × 10(-4) RIU (linear fitting R2 = 0.954) was achieved for sucrose solutions with refractive indices ranging between 1.333 and 1.383.The results provided additional information, specifically, a superior sensor resolution of 5.73 × 10(-5) RIU, and greater linearity at R2 = 0.999.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, National Chung Cheng University, Chiayi 621, Taiwan. saesozj@yahoo.com.tw

ABSTRACT
This study investigates the CO2 laser-stripped partial cladding of silica-based optic fibers with a core diameter of 400 μm, which enables them to sense the refractive index of the surrounding environment. However, inappropriate treatments during the machining process can generate a number of defects in the optic fiber sensors. Therefore, the quality of optic fiber sensors fabricated using CO2 laser machining must be analyzed. The results show that analysis of the fiber core size after machining can provide preliminary defect detection, and qualitative analysis of the optical transmission defects can be used to identify imperfections that are difficult to observe through size analysis. To more precisely and quantitatively detect fabrication defects, we included a tensile test and numerical aperture measurements in this study. After a series of quality inspections, we proposed improvements to the existing CO2 laser machining parameters, namely, a vertical scanning pathway, 4 W of power, and a feed rate of 9.45 cm/s. Using these improved parameters, we created optical fiber sensors with a core diameter of approximately 400 μm, no obvious optical transmission defects, a numerical aperture of 0.52 ± 0.019, a 0.886 Weibull modulus, and a 1.186 Weibull-shaped parameter. Finally, we used the optical fiber sensor fabricated using the improved parameters to measure the refractive indices of various solutions. The results show that a refractive-index resolution of 1.8 × 10(-4) RIU (linear fitting R2 = 0.954) was achieved for sucrose solutions with refractive indices ranging between 1.333 and 1.383. We also adopted the particle plasmon resonance sensing scheme using the fabricated optical fibers. The results provided additional information, specifically, a superior sensor resolution of 5.73 × 10(-5) RIU, and greater linearity at R2 = 0.999.

No MeSH data available.


Related in: MedlinePlus