Dynamic strain measurement using two wavelength-matched fiber Bragg grating sensors interrogated by a cascaded long-period fiber grating

Zou, Hongbo; Liang, Dakai; Zeng, Jie

doi:10.1016/j.optlaseng.2011.09.005

Cited by 30 publications

(7 citation statements)

References 17 publications

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“…The linear sensitivity is 1.19 mV/µε and the linear fitting degree was 0.99212. Compared with the two wavelength-matched fiber Bragg grating (FBG) sensors’ system proposed by Zou et al (2012) with a sensitivity of 0.098511 mV/µε, the sensitivity in our system is improved by a factor of 12.…”

Section: Voltage-based Demodulation Principle and Resultsmentioning

confidence: 97%

Voltage demodulation and vibration monitoring based on a polarization maintaining fiber loop mirror

Jiang

Liang

2016

Journal of Intelligent Material Systems and Structures

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Wavelength demodulation for a polarization maintaining fiber loop mirror sensor using an optical spectrum analyzer is not only expensive but also not suitable for vibration monitoring. In this work, we demonstrate a voltage-based polarization maintaining fiber loop mirror sensor demodulation principle. In our experiments, we observed that the light intensity from the output interference spectrum at a certain wavelength increased with increasing strain. To remove the expensive optical spectrum analyzer, we converted the light intensity signals into voltage signals using a photo-detector. The obtained demodulation linear sensitivity was 1.19 mV/µε. Compared with fiber Bragg grating sensors, the sensitivity in our system was improved greatly. Furthermore, the polarization maintaining fiber loop mirror was applied to vibration monitoring. A vibration exciter was attached underneath the specimen for use as a vibration source. A laser displacement sensor was used for comparison. The experimental results show that the polarization maintaining fiber loop mirror performs better at high frequencies than the laser displacement sensor, and that signals below 20 Hz measured by the polarization maintaining fiber loop mirror were distorted as a result of exceeding the measurement range. In addition, we have proposed further decreasing the distortion by reducing the polarization maintaining fiber length and fabricating a polarization maintaining fiber loop mirror sensor with a different dynamic measurement range by adjusting the polarization maintaining fiber length.

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Section: Voltage-based Demodulation Principle and Resultsmentioning

confidence: 97%

Voltage demodulation and vibration monitoring based on a polarization maintaining fiber loop mirror

Jiang

Liang

2016

Journal of Intelligent Material Systems and Structures

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“…Where λ is the wavelength of the spectrum. According to the edge filter principle, the output light power of the modulated spectrum by the PM-FLM using the narrow-band light source as input, which will be inputted into a photo-detector and be converted into the voltage signal, is the convolution of two inputs of R(λ) and H(λ) and is described as [20]…”

Section: Influence Of Light Source On the Strain Sensitivitymentioning

confidence: 99%

Influence of light source on the strain sensitivity of a polarisation maintaining fibre loop mirror based on voltage demodulation

Jiang

Zhang

2019

IET Optoelectronics

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“…where and correspond to the central wavelengths of chaotic spectra and FBG separately, and correspond to the reflectivity of TFBG and FBG at their central wavelengths, and are their full width at half maximum (FWHM) [20]. The output voltage 1 V of the chaotic fiber laser from PD-1 and the voltage 2 V of reflected signal by FBG from PD-2 may be obtained by the following integral:…”

Section: Demodulation Principle Of Sensing Systemmentioning

confidence: 99%

A novel demodulation scheme for high precision quasi-distributed sensing system based on chaotic fiber laser

Zhang

Yang

et al. 2015

Sensors and Actuators A: Physical

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Dynamic strain measurement using two wavelength-matched fiber Bragg grating sensors interrogated by a cascaded long-period fiber grating

Cited by 30 publications

References 17 publications

Voltage demodulation and vibration monitoring based on a polarization maintaining fiber loop mirror

Voltage demodulation and vibration monitoring based on a polarization maintaining fiber loop mirror

Influence of light source on the strain sensitivity of a polarisation maintaining fibre loop mirror based on voltage demodulation

A novel demodulation scheme for high precision quasi-distributed sensing system based on chaotic fiber laser

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