An optimized strain demodulation method for PZT driven fiber Fabry–Perot tunable filter

Sheng, Wenjuan; Peng, Gang-Ding; Liu, Yang; Yang, Ning

doi:10.1016/j.optcom.2015.03.042

Cited by 24 publications

(7 citation statements)

References 18 publications

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“…One of the commonly used FBG interrogator types is based on the FFP filter [1,2]. However, the nonlinearity, the path dependence, and the ambient temperature dependence of the FFP filter are issues that remain to be solved [17][18][19][20]. For dealing with these issues, we propose an FFP filter-based FBG interrogator with a peak detection process unit and a calibration process unit, as shown in Fig.…”

Section: Ffp Filter-based Fbg Interrogator With Calibration Process Unitmentioning

confidence: 99%

“…Lo et al [17] introduced an FBG interrogation system with an FFP filter that used a single A-thermal FBG and four A-thermal FBGs as the reference for the thermal effects. Sheng et al [18] proposed a strain-demodulation method based on an FFP filter using a parallel-processing mode to drive the piezoelectrical transducer (PZT) continuously for eliminating the hysteresis effect of the FFP filter. Liu et al [19] investigated PZTdriven FFP tunable filter nonlinearity modelling using the polynomial fit.…”

Section: Introductionmentioning

confidence: 99%

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Improved FBG interrogator considering FFP filter nonlinearity and investigation into performance limit

Jeong

Choi

Pan

2020

IET Science, Measurement & Technology

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Section: Ffp Filter-based Fbg Interrogator With Calibration Process Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved FBG interrogator considering FFP filter nonlinearity and investigation into performance limit

Jeong

Choi

Pan

2020

IET Science, Measurement & Technology

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“…The key to FBG sensing is to interrogate the Bragg wavelength accurately. A variety of FBG interrogation schemes have been developed, such as tunable Fabry-Perot (F-P) filter method [3], [4], optical interferometer method [5], coherent ultrashort pulsed light source [6], spectrum analysis method [7], and so on. The commercial devices, such as the Micron Optics si255, have achieved a ∼1 pm wavelength stability [8].…”

Section: Introductionmentioning

confidence: 99%

A Method of HCN Gas Spectrum Denoising and Baseline Removal Used for FBG Interrogation

et al. 2020

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Hydrogen cyanide (HCN) gas based fiber Bragg grating (FBG) interrogation is a promising approach in thermal cycling environment. However, the HCN spectrum suffers from strong noise and baseline wander induced by the interrogation system, which limits the measurement stability and reliability. In this paper, we propose an integrated method for spectral denoising and baseline removal to improve the interrogation performance. The method combines the classical empirical mode decomposition (EMD) with the recently developed convolution window (CW) filtering. After the HCN spectrum is decomposed by EMD, the noise and baseline components are extracted from the intrinsic mode functions via a ''multiband'' filtering approach. Verification experiments are performed using HCN gas cells with different absorption spectra. The results show that the proposed method is able to remove both noise and baseline with minimum signal distortion. Compared with other methods, the optimal interrogation stability with 25 Torr HCN gas cell is improved from ±1.43 pm to ±0.87 pm. For the 100 Torr HCN gas cell, the optimal interrogation stability is improved from ±1.75 pm to ±0.99 pm. In addition, the proposed method also improves the reliability of the interrogation system in the case of large light attenuation.

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“…The FBG demodulation method based on tunable Fabry-Perot (F-P) filter is a reliable demodulation method with high accuracy, which has been widely employed in various fields [3], [4]. The F-P filter is driven by a triangle signal according to the inverse piezoelectric effect, and generates output light with scanning wavelength [5]- [7]. However, the operating environment will suffer from severe temperature variation in some application areas, such as highland, desert or space.…”

Section: Introductionmentioning

confidence: 99%

The Correction of Nonlinearity in Wavelength Scanning Based on Long-OPD Interferometer for Fiber Bragg Grating Demodulation in Environment With Variable Temperature

et al. 2020

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Fabry-Perot (F-P) filter based fiber Bragg grating (FBG) demodulation has been widely applied in many areas. However, the F-P filter suffers from random fluctuation in wavelength scanning when the ambient temperature changes severely, which reduces the demodulation accuracy inevitably. In this paper, a demodulation method based on an etalon and a fiber-optic Michelson interferometer is proposed to improve the demodulation accuracy in an environment with variable temperature. The experiment is carried out by constructing an interferometer with long-optical path difference (OPD). When the environment temperature increases from 20°C to 60°C in 30 minutes, the results show that the error of the proposed method is reduced from ± 20.39 pm to ± 6.89 pm. The standard deviation is 3.11 pm, which is reduced by 43.92% compared with the etalon-based demodulation method.

show abstract

An optimized strain demodulation method for PZT driven fiber Fabry–Perot tunable filter

Cited by 24 publications

References 18 publications

Improved FBG interrogator considering FFP filter nonlinearity and investigation into performance limit

Improved FBG interrogator considering FFP filter nonlinearity and investigation into performance limit

A Method of HCN Gas Spectrum Denoising and Baseline Removal Used for FBG Interrogation

The Correction of Nonlinearity in Wavelength Scanning Based on Long-OPD Interferometer for Fiber Bragg Grating Demodulation in Environment With Variable Temperature

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