Low-cost, high sensitivity, signal processing-enhanced fiber Bragg grating sensing system for condition-based maintenance application

Daniele Tosi, Guido Perrone

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper presents a low-cost, high sensitivity fiber Bragg grating sensing system specifically designed to measure the amplitude of weak signals at audio frequencies. Low cost is obtained using for the optical part an intensity based interrogation scheme, with time and wavelength division multiplexing to create a sensor network that minimizes the expense per sensing point. Then, performances are dramatically improved using sequential signal processing techniques, which clear noise inside and outside the sensor, and provide an exceptionally performing spectral estimation. This way, the sensor gains 66 dB of signal-to-noise performance, and is able to measure vibrations as low as few picostrains, with a frequency resolution of 0.05 Hz. Example of application to multipoint condition-based maintenance application in industrial machineries is given. In this case, the proposed optical sensor is used to detect very weak signals buried into noise coming from ball bearings and rotating elements that are about to break, and can raise a warning alert well before critical damages occur.

Original languageEnglish
Pages (from-to)1415-1422
Number of pages8
JournalSensor Letters
Volume9
Issue number4
DOIs
Publication statusPublished - Aug 2011
Externally publishedYes

Fingerprint

Fiber Bragg gratings
Bragg gratings
maintenance
signal processing
Signal processing
Time division multiplexing
fibers
Ball bearings
sensitivity
sensors
Sensors
Optical sensors
Wavelength division multiplexing
Sensor networks
time division multiplexing
ball bearings
Costs
audio frequencies
warning
interrogation

Keywords

  • Condition-based maintenance
  • Digital signal processing
  • Fiber Bragg gratings
  • Optical fiber sensor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

Cite this

Low-cost, high sensitivity, signal processing-enhanced fiber Bragg grating sensing system for condition-based maintenance application. / Tosi, Daniele; Perrone, Guido.

In: Sensor Letters, Vol. 9, No. 4, 08.2011, p. 1415-1422.

Research output: Contribution to journalArticle

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