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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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Experiment setup and result of the mechanical adjustment: (a) schematic diagram of the mechanical adjustment; (b) experimental results of the stability of the power ratio with reFBG stretched by the mechanical adjustment; (c) experimental results of the stability of the overlapping optical power.
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sensors-15-16516-f009: Experiment setup and result of the mechanical adjustment: (a) schematic diagram of the mechanical adjustment; (b) experimental results of the stability of the power ratio with reFBG stretched by the mechanical adjustment; (c) experimental results of the stability of the overlapping optical power.

Mentions: As shown in Figure 9a, the mechanical adjustment system to satisfy the optimal initial matching condition consists of a cylindrical stage, oil groove, and translation stage. The dimensions of the mechanical adjustment system are 7 cm × 5 cm × 1.5 cm, which is small enough to ensure the reFBG and seFBG are close in the environment of a clean room with the same temperature gradient. One end of the fiber comprising the reFBG is twined around the cylindrical stage, and the other end is compacted on the translation stage through the oil groove. A pulling force is applied on the reFBG by adjusting the translation stage.


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)

Experiment setup and result of the mechanical adjustment: (a) schematic diagram of the mechanical adjustment; (b) experimental results of the stability of the power ratio with reFBG stretched by the mechanical adjustment; (c) experimental results of the stability of the overlapping optical power.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-16516-f009: Experiment setup and result of the mechanical adjustment: (a) schematic diagram of the mechanical adjustment; (b) experimental results of the stability of the power ratio with reFBG stretched by the mechanical adjustment; (c) experimental results of the stability of the overlapping optical power.
Mentions: As shown in Figure 9a, the mechanical adjustment system to satisfy the optimal initial matching condition consists of a cylindrical stage, oil groove, and translation stage. The dimensions of the mechanical adjustment system are 7 cm × 5 cm × 1.5 cm, which is small enough to ensure the reFBG and seFBG are close in the environment of a clean room with the same temperature gradient. One end of the fiber comprising the reFBG is twined around the cylindrical stage, and the other end is compacted on the translation stage through the oil groove. A pulling force is applied on the reFBG by adjusting the translation stage.

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