Abstract:

In view of the weak signal of the Fiber Bragg Grating (FBG) sensor,a low noisy photoelectric signal pre-processing circuit is designed which has the functions of current-voltage conversion,multi-level amplifier and filter.Simulation and experiment indicate that it is capable of great gain,high signal-to-noise ratio (SNR),high sensitivity to satisfy the requirements of the FBG sensing system and to achieve the measurement of the weak nano watt (nW) optical signal.

Key words: FBG sensor;F-P tunable filter;signal preprocessing