Unclad plastic optical fiber temperature sensor with a balloon-like structure
An unclad plastic optical fiber (POF) temperature sensor with high sensitivity is experimentally demonstrated in this work. The working principle of this developed unclad POF sensor is based on intensity-modulated technique. In general, position and length of the unclad region in this developed s...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2022
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8284/1/24p%20NAZRAH%20ILYANA%20SULAIMAN.pdf http://eprints.uthm.edu.my/8284/2/NAZRAH%20ILYANA%20SULAIMAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8284/3/NAZRAH%20ILYANA%20SULAIMAN%20WATERMARK.pdf http://eprints.uthm.edu.my/8284/ |
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| Summary: | An unclad plastic optical fiber (POF) temperature sensor with high sensitivity is
experimentally demonstrated in this work. The working principle of this developed
unclad POF sensor is based on intensity-modulated technique. In general, position and
length of the unclad region in this developed sensor has influenced the output light
intensity, thus, influencing the sensor performance. In this work, we fixed the location
of the unclad region at the middle of the sensor head. As for the length of the unclad
region, optical intensity measurement was carried out. It was observed that the
increment of length in the unclad region contributed to the increase of intensity losses.
Therefore, the unclad length of 1.0 cm was considered as the optimal value due to its
higher linearity and optical loss performances and was used in the bending analysis for
balloon-like bent POF sensor. The sensor was realized by combining macro bending
and the unclad region in the fabrication of its sensor head. The POF sensor was bent
to a balloon-like structure to introduce the effect of macro bending. For optimization
of the sensor performances, the sensor bending radius was varied. Experimental results
suggest that performances of the POF sensor are optimized when the bending radius is
fixed at 55 mm. With this amount of bending radius, temperature sensitivity up to 22.2
x10-3 °C -1 was achieved in the range from 40 °C to 80 °C with the linearity of 0.99
and resolution of 0.45 °C. This technique improves the POF temperature sensitivity in
comparison to previous developments. |
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