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Title: Multiplexable intrinsic Fabry-Pérot interferometers inscribed by femtosecond laser for vibration measurement in high temperature environments

Journal Article · · Sensors and Actuators. A, Physical
 [1];  [2];  [3];  [4];  [2]
  1. Univ. of Pittsburgh, PA (United States). Dept. of Electrical and Computer Engineering; Dalian Univ. of Technology (China). School of Optoelectronic Engineering and Instrumentation Science
  2. Univ. of Pittsburgh, PA (United States). Dept. of Electrical and Computer Engineering
  3. Peking Univ., Beijing (China). College of Chemistry and Molecular Engineering
  4. Dalian Univ. of Technology (China). School of Optoelectronic Engineering and Instrumentation Science
+ Show Author Affiliations

This article reports fabrication technique and demodulation algorithm developments to use multiplexable intrinsic Fabry-Pérot interferometer (IFPI) fiber sensor array for distributed vibration measurements at high temperatures. Using femtosecond laser direct writing scheme, IFPI array were fabricated through laser-induced Type II scattering points in single mode fiber cores. Reflection spectra of IFPI array were demodulated in real-time using modified Bunemen frequency analysis. The demodulation algorithm, which was implemented using a photodetector-array spectrometer, achieves 64-nε dynamic strain resolution at 1-kHz spectral acquisition rate and 2-kHz maximum vibration bandwidth. Performance and stabilities of IFPI sensor array were characterized from room temperatures to 800 °C. The static strain resolution was 0.6 με and the minimum detectable dynamic strain amplitude was 23 nε/√Hz at 800 °C. The multiplex performance was also tested by measuring dynamic strain in time domain through six IFPI sensor array fabricated in one fiber. This paper presents an integrated and low-cost sensing solution to perform distributed vibration measurements in harsh environments.

Research Organization:
Univ. of Pittsburgh, PA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0031175; NE0008686; LW-18IN060209
OSTI ID:
1849242
Alternate ID(s):
OSTI ID: 1809669
Journal Information:
Sensors and Actuators. A, Physical, Vol. 321, Issue C; ISSN 0924-4247
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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42 ENGINEERING
47 OTHER INSTRUMENTATION
Engineering
Instruments & Instrumentation
Femtosecond laser
Rayleigh enhancement
Dynamic strain
High temperature
Intrinsic Fabry-Pérot interferometers
Vibration