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Related Concept Videos

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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
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High Sensitivity Refractometer Based on a Tapered-Single Mode-No Core-Single Mode Fiber Structure.

Wenlei Yang1, Shuo Zhang2, Tao Geng3

  • 1Key Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin 150001, China. yangwenlei@hrbeu.edu.cn.

Sensors (Basel, Switzerland)
|April 13, 2019
PubMed
Summary

A new tapered-single mode-no core-single mode (TSNS) fiber refractometer was developed for precise refractive index measurements. This device shows high sensitivity and stable performance, with results validated by simulations.

Keywords:
Fiber optics sensorno core fiberrefractive index sensor

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Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Interferometry

Background:

  • Refractometers are crucial for measuring liquid properties.
  • Fiber optic sensors offer advantages in remote and harsh environment sensing.
  • Multimode interference (MMI) in optical fibers enables sensitive detection methods.

Purpose of the Study:

  • To propose and investigate a novel tapered-single mode-no core-single mode (TSNS) fiber refractometer.
  • To analyze the impact of TSNS structure parameters on refractive index sensitivity.
  • To evaluate the sensor's performance, including sensitivity and temperature stability.

Main Methods:

  • Fabrication of a TSNS fiber structure.
  • Utilizing multimode interference for sensing.
  • Experimental investigation of varying TSNS lengths and diameters.
  • Measurement of refractive index sensitivity and temperature sensitivity.

Main Results:

  • The TSNS fiber refractometer demonstrated a high contrast ratio (>15 dB) and uniform interference fringes.
  • Maximum refractive index (RI) sensitivity reached 1517.28 nm/RIU at n=1.417.
  • Low-temperature sensitivity was observed (<10 pm/ºC).
  • Experimental and simulation results showed good agreement.

Conclusions:

  • The proposed TSNS fiber refractometer is a promising device for accurate refractive index sensing.
  • The sensor exhibits high sensitivity and excellent temperature stability.
  • The findings validate the potential of MMI-based fiber sensors for various applications.