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Employing a fiber Fabry-Perot (FFP) interferometer has been considered as a triangle notch filter to demodulate the wavelength of fiber Bragg grating (FBG) sensor.The single parameter of strain has been demodulated,and the cross-sensitivity influence of temperature has been eliminated.The principle of this method is simple and easy to be implemented,and has been used to design a 30 t fiber grating weightbridge successfully.The maximal temperature drift error of the weightbridge is 4 με,which means that the full scale error is 8‰. The result reveals that the accuracy is high enough to be used in measurement.
Employing a fiber Fabry-Perot (FFP) interferometer has been considered as a triangle notch filter to demodulate the wavelength of fiber Bragg grating (FBG) sensor. The single parameter of strain has been demodulated, and the cross-sensitivity influence of temperature has been The principle of this method is simple and easy to be implemented, and has been used to design a 30 t fiber grating weightbridge successfully. maximal temperature drift error of the weightbridge is 4 με, which means that the full scale error is 8 ‰. The result reveals that the accuracy is high enough to be used in measurement.