Measurement of environmental parameters of temperature and strain at the same time with a uniform fiber Bragg grating

Document Type : Original Article

Authors

1 PhD student, Imam Hossein University, Tehran, Iran.

2 Assistant Professor, Imam Hossein (AS) University, Tehran, Iran

3 PhD student, Iran University of Science and Technology, Tehran, Iran

Abstract

Today, a wide variety of methods have been proposed to measure temperature and strain at the same time with the help of FBG sensors, all of which can be divided into two general categories. Methods that use two or more uniform or non-uniform FBGs for the measurement, and methods that use only one non-uniform FBG for this purpose. In this paper, unlike all the methods proposed so far, for the measurement of temperature and strain at the same time, the use of only one uniform FBG is proposed, which will occupy the least amount of spectral range of the broadband source. In this method, a mechanical tool called a cantilever is used to convert uniform strain to non-uniform strain during FBG. With this method, the peak power of reflection spectrum of the Bragg grating will be sensitive to changes in the applied strain to the grating while not reacting to temperature changes. As a result, the strain will be determined by changes in reflection peak power and temperature by changes in reflection Bragg wavelength. According to the simulation results, the sensitivity of this sensor to the temperature is 14.21 / pm/℃ and to the strain was 0.68136 pm/με.

Keywords

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Applied Electromagnetics
Volume 11, Issue 2 - Serial Number 27
September 2023
Pages 11-16

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History

  • Receive Date: 19 May 2023
  • Revise Date: 07 August 2023
  • Accept Date: 12 September 2023
  • Publish Date: 07 November 2023

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