Limits...
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.

Show MeSH
Schematic diagram of seFBG vibration signal generator.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4541891&req=5

sensors-15-16516-f014: Schematic diagram of seFBG vibration signal generator.

Mentions: An experiment is conducted to verify the feasibility of the proposed method when applied to high speed interrogation. The seFBG is glued on a PZT circular vibrator along the direction of the thickness, and the location of the FBG is at the center of the wall as shown in Figure 14. The PZT circular vibrator applies a dynamic strain to the seFBG to simulate vibrations while it is driven by a sinusoidal signal at 100, 200, 300, 400 and 500 kHz, respectively, in multi-group experiments. The temporal responses of the system are firstly tested using a vibration of 200 kHz with a known peak-to-peak strain as shown in Figure 15a, and this interrogation method can clearly detect the ultrasonic waves and the peak-to-peak central wavelength shift is about 0.4 pm. Then, based on the Fourier transform analysis of power ratio sampling values, the frequency of power ratio can be obtained as shown in Figure 15b. The result indicates that the proposed interrogation can detect the vibration over a wide frequency range, even at 500 kHz, and higher frequency vibrations can be detected by using a high-performance DSP or other signal acquisition devices.


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)

Schematic diagram of seFBG vibration signal generator.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-16516-f014: Schematic diagram of seFBG vibration signal generator.
Mentions: An experiment is conducted to verify the feasibility of the proposed method when applied to high speed interrogation. The seFBG is glued on a PZT circular vibrator along the direction of the thickness, and the location of the FBG is at the center of the wall as shown in Figure 14. The PZT circular vibrator applies a dynamic strain to the seFBG to simulate vibrations while it is driven by a sinusoidal signal at 100, 200, 300, 400 and 500 kHz, respectively, in multi-group experiments. The temporal responses of the system are firstly tested using a vibration of 200 kHz with a known peak-to-peak strain as shown in Figure 15a, and this interrogation method can clearly detect the ultrasonic waves and the peak-to-peak central wavelength shift is about 0.4 pm. Then, based on the Fourier transform analysis of power ratio sampling values, the frequency of power ratio can be obtained as shown in Figure 15b. The result indicates that the proposed interrogation can detect the vibration over a wide frequency range, even at 500 kHz, and higher frequency vibrations can be detected by using a high-performance DSP or other signal acquisition devices.

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