A wavelength readout scheme for fiber Bragg grating(FBG) sensors based on all phase traversal FIR filter technique is proposed.The tunable Fabry-Perot(F-P) filter is scanned with the ramp voltage generated by the system internal digital clock.Combined with the virtual instrument,the wavelengths of FBGs are sampled with the data acquisition card in real time under the control of synchronous clock.The data sequence is filtered off-line by all phase filter with the help of Matlab.By comparing the r...