4.7 Article

Sensitive Handheld Refractometer by Using Combination of a Tapered Fiber Tip and a Multimode Fiber

期刊

JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 12, 页码 4179-4185

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3030897

关键词

Optical fiber sensors; Refractive index; Optical fiber testing; Optical fiber theory; Mirrors; Sensitivity; Angular spectrum; glucose solution; handheld refractometer; tapered fiber

资金

  1. Ministry of Science and Technology, Taiwan [105-2627B-001-001]
  2. Thematic Project of Academia Sinica [AS-106-TP-A03]
  3. Japan Society for the Promotion of Science (JSPS) KAKENHI [JP17H03229]

向作者/读者索取更多资源

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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