Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 12, Pages 4179-4185Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3030897
Keywords
Optical fiber sensors; Refractive index; Optical fiber testing; Optical fiber theory; Mirrors; Sensitivity; Angular spectrum; glucose solution; handheld refractometer; tapered fiber
Funding
- Ministry of Science and Technology, Taiwan [105-2627B-001-001]
- Thematic Project of Academia Sinica [AS-106-TP-A03]
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP17H03229]
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This work introduces a sensitive handheld refractometer using a tapered fiber tip and multimode fiber, which is capable of measuring the refractive index of surrounding solutions to determine properties of various liquids. The sensor demonstrates high resolution under specific conditions and can handle hand-held vibrations and environmental disturbances.
This work presents a sensitive handheld refractometer using a tapered fiber tip, a multimode fiber, and a tiny mirror. The taper fiber tip was made using a modified wet etching method. The angular intensity distribution of the transmission light from the tapered fiber is sensitive to the refractive index of the surrounding solution. The low angular wave was reflected and collected by a multimode fiber. By setting a small collection angle and 10-mm distance between the fibers and the mirror, the maximum intensity sensitivity reaches up to 7.8 x 10(5)%/RIU (refractive index unit). The sensor resolution of the sensor probe can achieve 8.7 x 10(-5) RIU under 0.25% laser intensity stability. The simple handheld refractometer can be used to determine the properties of various liquids. For the glucose solution measurement under handheld condition, 0 to 50 degrees Bx can be distinguished by monitoring the intensity change. Considering the hand vibration and environmental disturbance, the sensor resolution was 1.22 degrees Bx.
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