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FBG Interrogation Method with High Resolution and Response Speed Based on a Reflective-Matched FBG Scheme.

Cui J, Hu Y, Feng K, Li J, Tan J - Sensors (Basel) (2015)

Bottom Line: To satisfy the measurement requirements of optical and electric signal processing, a well- designed acquisition circuit board is prepared, and experiments on the performance of the interrogation method are carried out.The experimental results indicate that the optical power resolution of the acquisition circuit border is better than 8 pW, and the stability of the interrogation method with the mechanical adjustment can reach 0.06%.Moreover, the nonlinearity of the interrogation method is 3.3% in the measurable range of 60 pm; the influence of temperature is significantly reduced to 9.5%; the wavelength resolution and response speed can achieve values of 0.3 pm and 500 kHz, respectively.

View Article: PubMed Central - PubMed

Affiliation: Institute of Ultra-precision Optoelectronic Instrument Engineering, Science Park, Harbin Institute of Technology, No. 2 Yikuang Street, Nangang District, Harbin 150080, China. cuijiwen@hit.edu.cn.

ABSTRACT
In this paper, a high resolution and response speed interrogation method based on a reflective-matched Fiber Bragg Grating (FBG) scheme is investigated in detail. The nonlinear problem of the reflective-matched FBG sensing interrogation scheme is solved by establishing and optimizing the mathematical model. A mechanical adjustment to optimize the interrogation method by tuning the central wavelength of the reference FBG to improve the stability and anti-temperature perturbation performance is investigated. To satisfy the measurement requirements of optical and electric signal processing, a well- designed acquisition circuit board is prepared, and experiments on the performance of the interrogation method are carried out. The experimental results indicate that the optical power resolution of the acquisition circuit border is better than 8 pW, and the stability of the interrogation method with the mechanical adjustment can reach 0.06%. Moreover, the nonlinearity of the interrogation method is 3.3% in the measurable range of 60 pm; the influence of temperature is significantly reduced to 9.5%; the wavelength resolution and response speed can achieve values of 0.3 pm and 500 kHz, respectively.

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Relation between the power ratio and the central wavelength difference between the reFBG and seFBG while the FWHM of the seFBG and reFBG are not equal: (a) full scale (b) most sensitive section with the nonlinearity of 1%.
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sensors-15-16516-f006: Relation between the power ratio and the central wavelength difference between the reFBG and seFBG while the FWHM of the seFBG and reFBG are not equal: (a) full scale (b) most sensitive section with the nonlinearity of 1%.

Mentions: The seFBG and reFBG’s spectra are usually different, even they have same grating parameters. The main difference between the seFBG and reFBG is their FWHM as a result of the fabrication errors or the spectral broadening introduced by the high frequency vibration of the seFBG in frequency response experiments. Figure 6a shows the relation between the central wavelength difference and the power ratio with different FWHMs of the seFBG and reFBGs’ spectra. It can be seen that the approximately linear section still exists without losing sensitivity, but the initial power ratio and measurable range increases and the optimal initial matching condition changes according to Figure 5b. The optimal initial matching condition is practical on the condition that the FWHMs of the seFBG and reFBG is not equal, and it can be driven from the steps of Equations (6) and (7) and given in a universal expression as:(9)/λ1−λ2/=Δλ12+Δλ228ln2


FBG Interrogation Method with High Resolution and Response Speed Based on a Reflective-Matched FBG Scheme.

Cui J, Hu Y, Feng K, Li J, Tan J - Sensors (Basel) (2015)

Relation between the power ratio and the central wavelength difference between the reFBG and seFBG while the FWHM of the seFBG and reFBG are not equal: (a) full scale (b) most sensitive section with the nonlinearity of 1%.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541891&req=5

sensors-15-16516-f006: Relation between the power ratio and the central wavelength difference between the reFBG and seFBG while the FWHM of the seFBG and reFBG are not equal: (a) full scale (b) most sensitive section with the nonlinearity of 1%.
Mentions: The seFBG and reFBG’s spectra are usually different, even they have same grating parameters. The main difference between the seFBG and reFBG is their FWHM as a result of the fabrication errors or the spectral broadening introduced by the high frequency vibration of the seFBG in frequency response experiments. Figure 6a shows the relation between the central wavelength difference and the power ratio with different FWHMs of the seFBG and reFBGs’ spectra. It can be seen that the approximately linear section still exists without losing sensitivity, but the initial power ratio and measurable range increases and the optimal initial matching condition changes according to Figure 5b. The optimal initial matching condition is practical on the condition that the FWHMs of the seFBG and reFBG is not equal, and it can be driven from the steps of Equations (6) and (7) and given in a universal expression as:(9)/λ1−λ2/=Δλ12+Δλ228ln2

Bottom Line: To satisfy the measurement requirements of optical and electric signal processing, a well- designed acquisition circuit board is prepared, and experiments on the performance of the interrogation method are carried out.The experimental results indicate that the optical power resolution of the acquisition circuit border is better than 8 pW, and the stability of the interrogation method with the mechanical adjustment can reach 0.06%.Moreover, the nonlinearity of the interrogation method is 3.3% in the measurable range of 60 pm; the influence of temperature is significantly reduced to 9.5%; the wavelength resolution and response speed can achieve values of 0.3 pm and 500 kHz, respectively.

View Article: PubMed Central - PubMed

Affiliation: Institute of Ultra-precision Optoelectronic Instrument Engineering, Science Park, Harbin Institute of Technology, No. 2 Yikuang Street, Nangang District, Harbin 150080, China. cuijiwen@hit.edu.cn.

ABSTRACT
In this paper, a high resolution and response speed interrogation method based on a reflective-matched Fiber Bragg Grating (FBG) scheme is investigated in detail. The nonlinear problem of the reflective-matched FBG sensing interrogation scheme is solved by establishing and optimizing the mathematical model. A mechanical adjustment to optimize the interrogation method by tuning the central wavelength of the reference FBG to improve the stability and anti-temperature perturbation performance is investigated. To satisfy the measurement requirements of optical and electric signal processing, a well- designed acquisition circuit board is prepared, and experiments on the performance of the interrogation method are carried out. The experimental results indicate that the optical power resolution of the acquisition circuit border is better than 8 pW, and the stability of the interrogation method with the mechanical adjustment can reach 0.06%. Moreover, the nonlinearity of the interrogation method is 3.3% in the measurable range of 60 pm; the influence of temperature is significantly reduced to 9.5%; the wavelength resolution and response speed can achieve values of 0.3 pm and 500 kHz, respectively.

Show MeSH