A novel FBG sensing signal demodulation system based on ARM7 and LabVIEW8.6 is proposed. Matching FBG
demodulation method is used to demodulate the luminous intensity signal. The screw attached to stepper motor is
controlled by ARM7 microprocessor to impel the cantilever and makes the matching FBG adhered on the cantilever to
scan the Bragg wavelengths offset of the sensing FBG. With the synthetics curve of the steps of the motor and Bragg
wavelengths of the sensing FBG, we can calculate the tiny offset of wavelength and realize the intention of FBG sensing
signal demodulation. After being processed by the weak signal processing circuit and AD convert circuit, the electrical
signal converted from the luminous intensity signal enters the MCU. The data coming from the ARM is filtered by the
LabVIEW and displayed on the PC. The maximal strain measuring range of 1100με and the measuring accuracy of ±1με
are archived in the experiment. The experiment shows that the result of strain tested and the theory one have a good
linear relationship.
A new fiber Bragg grating (FBG) sensing demodulation system based on Lab VIEW and the technology of fiber Bragg
grating sensing is designed. The system based on unbalanced M-Z interferometer demodulation technique translates the
FBG wavelength signal related with the strain in to phase signal and measures the change of the phase with a phase
measurement system based on Lab VIEW. With the characteristics of high resolution and wide measurement range, this
sensor system has the capability of measuring static strain as well as dynamic strain. Experimental shows that the result
of strain tested and theory one have a good linear relationship. The strain sensitivity of the experiment system is
1.2pm/με.
In this paper, a novel temperature stabilization technique for Fiber Bragg Grating is presented, named dual-arm adverse expanding technique. Experiment demonstrates, the Bragg wavelength shift of FBG treated with this technique is only 0.03nm in range from 12°C to 62°C. It is equivalent to 0.07 nm/100°C. Temperature stability of FBG treated is 14 times higher than that of bare one. The Bragg wavelength shift of FBG induced by temperature is eliminated mostly.
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