Aiming at the problem that traditional fiber Bragg grating（ FBG） sensing signal spectrum peak seeking algorithm can not be applied to multi-peaks Fabry-Pérot（ F-P） interference sensing signal spectrum peak seeking

a multi-peaks F-P interference sensing signal spectrum wavelength peak seeking algorithm is proposed; a four eigenvalue method is used to collect sensing signal spectrum; a five-point sliding mean filtering method is used for signal spectrum processing; multi-peaks curve fitting and peak wavelength area segmentation are carried out by stepwise iterative Gauss fitting method; peak correction method is carried out to detect the peak wavelength. Through algorithm comparison test

average peak seeking error of direct peak seeking algorithm is 12. 1 pm

average peak seeking error of Monte Carlo peak seeking algorithm is 5. 2 pm

the average peak seeking error of Gaussian fitting peak seeking algorithm is 4. 1 pm

and the average peak seeking error of multi-peaks seeking algorithm is 1. 9 pm

the results show that the multi-peaks seeking algorithm has the lowest error and better effect of peak seeking.