Using the transfer matrix method, the influence of fiber Bragg gratings' (FBG) characteristics on the optical wavelength discriminator characteristics was analyzed. The wavelength discriminator forms FBG and cooperates with the identical FBG sensor. The calculation was made for uniform and chirped FBGs. The comparison of the discriminators processing range measurement was analyzed. Presented results are crucial while choosing parameters of FBG used in constructing optical wavelength discriminators for strain and pressure sensor.
This paper presents theoretical analysis of impulsive strain processing by fiber Bragg Grating (FBG) with linearly
changeable period. Tensile and compression excitations acting along the longitudinal fiber axis are studied. The
prepared calculation is based on the piecewise-uniform period assumption for chirped grating. Then the obtained
reflected spectrum is analyzed by calculating its centroid frequency. This allows it to calculate rise time error as a
function of length of distortion leading edge and grating length which allows it to establish influence of grating length
on processing accuracy.
The article presents the influence of the length of fiber Bragg grating with linear changeable period on processing accuracy of impulsive excitations acting along the longitudinal fiber axis. Using transfer matrix method the power reflectivity spectrums caused by impulsive strains are obtained. On this basis, assuming that grating's output signal is of centroidal frequency, the mean square error was evaluated as a function of the ratio of the length of the grating to the length of impulse, for different shapes of impulsive strains.
The article contains the analysis of influence of the length of a uniform fiber Bragg grating on the accuracy of transducing an impulsive strain. Using the matrix description of the grating, derived from the coupled mode theory, the waveforms were calculated of the power spectrum of the beam reflected by the grating, caused by the strain impulse propagating along it. On the basis of the introduced centroidal frequency of the grating, the mean square transducing error of the grating was calculated, as a function of the ratio of its length to the strain length, for rectangular, triangular, half-sinusoidal and trapezoidal strain impulses. This error was also calculated depending on full width at half maximum.
The goal is to model the behaviour of an apodized fibre Bragg grating (FBG) under impulsive strain of rectangular
shape. The transfer matrix method has been applied in this analysis. The changes induced in a spectrum of FBG are
calculated based on the piecewise-uniform period assumption for chirped gratings. The result demonstrates changing
spectrum of a FBG during processing impulsive quantities with different amplitudes.
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