A highly sensitive two-dimensional inclinometer based on two etched chirped-fiber-grating arrays

Hung Ying Chang, Yu Chung Chang, Wen Fung Liu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We present a novel two-dimensional fiber-optic inclinometer with high sensitivity by crisscrossing two etched chirped fiber Bragg gratings (CFBG) arrays. Each array is composed of two symmetrically-arranged CFBGs. By etching away most of the claddings of the CFBGs to expose the evanescent wave, the reflection spectra are highly sensitive to the surrounding index change. When we immerse only part of the CFBG in liquid, the effective index difference induces a superposition peak in the refection spectrum. By interrogating the peak wavelengths of the CFBGs, we can deduce the tilt angle and direction simultaneously. The inclinometer has a resolution of 0.003° in tilt angle measurement and 0.00187 rad in tilt direction measurement. Due to the unique sensing mechanism, the sensor is temperature insensitive. This sensor can be useful in long term continuous monitoring of inclination or in real-time feedback control of tilt angles, especially in harsh environments with violent temperature variation.

Original languageEnglish
Article number2922
JournalSensors (Switzerland)
Volume17
Issue number12
DOIs
Publication statusPublished - 2017 Dec 15

Fingerprint

Fiber Bragg gratings
gratings
Temperature
fibers
Fibers
Real time control
Temperature sensors
Angle measurement
Fiber optics
Bragg gratings
Feedback control
Etching
Wavelength
Monitoring
evanescent waves
Sensors
Liquids
temperature sensors
feedback control
inclination

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

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A highly sensitive two-dimensional inclinometer based on two etched chirped-fiber-grating arrays. / Chang, Hung Ying; Chang, Yu Chung; Liu, Wen Fung.

In: Sensors (Switzerland), Vol. 17, No. 12, 2922, 15.12.2017.

Research output: Contribution to journalArticle

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