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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 11,
  • Issue 2,
  • pp. 020601-
  • (2013)

Refractive index sensor based on a step index multimode polymer optical fiber with a micro-hole created by a miniature numerical control machine

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Abstract

A compact in-fiber refractive index (RI) sensor based on a step index multimode polymer optical fiber with a micro-hole drilled by a miniature numerical control machine is presented. A good linear relationship between the transmission and RI over a large operating range from 1.335 to 1.475 and a sensitivity of 36 071.43 mV/RIU (RI unit) are found. The relationship between the transmission and the RI of the hole depends on the micro-hole's diameter and depth. The RI sensor developed in this letter is low-cost, easily fabricated, and capable of continuous measurement.

© 2013 Chinese Optics Letters

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