Comparison of different peak detection algorithms with regards to spectrometic fiber Bragg grating interrogation systems

Tunable laser thin film interrogation

“…Another peak corresponds to the sum of both resonators. By applying a subpixel algorithm like a centroid algorithm [18], the accuracy is pushed below the resolution, provided by the FFT. All measurements, shown in this contribution, employ a three-element-centroid algorithm.…”

Poly-harmonic Analysis of Raman and Mandelstam-Brillouin Scatterings and Bragg Reflection Spectra

“…As is known, the spectral dependence of the transmission band of FBG-PS has almost Lorentzian profile [2,29]. If we assume that the spectral line width of the laser emission lines is negligibly small (~ several KHz), the spectral dependence of the transmission band of FBG-PS can be represented as follows:…”

“…To realize them it is essential to solve equations set (25) for indexes, varying not only amplitude modulation index but also the value of phase commutation θ. Using the oscillation S(t)=S 0 |sinΩt| we will get the following equations for amplitudes of spectral components [8]: (29) where S k are the partial amplitudes, E n are the equations for Fourier indexes of its spectrum, m k are partial indexes of amplitude modulation. Such approach of looking for forming oscillations will also allowed to take into account influence of real devices modulation characteristics nonlinearities on spectral distribution of output radiation, which are used to realize amplitude-phase conversion.…”

Theoretical Assessment of an All-Optical Temporal Low-Pass Filter for Dynamic Fiber Bragg Grating Signals

“…of the sensor is given by the center of gravity (COG) of the spectral sensor signature [16]. From a reflection spectrum I(λ), the Bragg wavelength is given by where I(λ) is the spectral intensity of the FBG peak.…”