Abstract
By using the linearity of the edge filter in a specific wavelength range of twin-core long period fiber grating(LPFG), a new method for measuring the strain of the fiber grating with high-precision and wide range measurement is proposed. Namely, proceeding from the demodulation principle of twin-core LPFG transmission spectrum and fiber Bragg grating(FBG) reflection spectrum, we designed a kind of high-precision twin-core LPFG demodulation system to demodulate strain sensing signal, which is based on the measurement of light intensity, and it is applicable to the static and dynamic measurement. And through the theoretical calculation and system simulation, the strain sensing signal can be achieved a 10nm range of linear demodulation, and the positive and negative strain can be detected, the linear fitting degree reached 99.58%, which is of good practical value.
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