We demonstrate the fabrication and the application of an in-fiber triangular filter (T-filter) based on a linearly chirped and apodized fiber Bragg grating (FBG).The theoretical analysis shows that this type of FBG T-...We demonstrate the fabrication and the application of an in-fiber triangular filter (T-filter) based on a linearly chirped and apodized fiber Bragg grating (FBG).The theoretical analysis shows that this type of FBG T-filter has a good response in the demodulation of a wavelength-matched FBG sensor.For the first time to our knowledge,such an FBG T-filter has been realized in our laboratory,and utilized to interrogate the signal of dynamic strain by a specially designed measurement scheme.Experimental results have proved that the system has a good performance in the measurement of dynamic strain.Because of its compactness and passiveness,such type of the device can be integrated as a portable demodulation module.展开更多
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,an...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.展开更多
基金This workis supported by the Science Foundation of Zhejiang Province ,China(R104154)
文摘We demonstrate the fabrication and the application of an in-fiber triangular filter (T-filter) based on a linearly chirped and apodized fiber Bragg grating (FBG).The theoretical analysis shows that this type of FBG T-filter has a good response in the demodulation of a wavelength-matched FBG sensor.For the first time to our knowledge,such an FBG T-filter has been realized in our laboratory,and utilized to interrogate the signal of dynamic strain by a specially designed measurement scheme.Experimental results have proved that the system has a good performance in the measurement of dynamic strain.Because of its compactness and passiveness,such type of the device can be integrated as a portable demodulation module.
文摘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.
