A method for filter demodulation based on erbium-doped superfluorescent fiber source(EDSFS)is studied,and the power spectrum shape of source is analyzed.Utilizing linear relation between the light power density and wavelength in the spectra,dynamic demodulation of fiber grating sensing signal is realized.The vibration measurement system is built by using high-precision differential transformer displacement sensors as a reference,the time-domain waveform and spectrum by two sensors output are compared and di...