Design of an optical sensing interrogator using an edge filter scheme

In this paper the design and initial development of a Fiber Bragg Grating (FBG) sensor interrogation system are presented. It uses an edge filter, among other optical components, and measures the wavelength signals with a microcontroller. The system was designed for the 1550 nanometers band with an acquisition rate of 2.5 kHz. The performance of the interrogator was tested obtaining a stable voltage ratio when changing the input signal and a linear performance of this voltage ratio when a temperature of 20-70° C is induced into a FBG sensor connected to the system. These results demonstrate the feasibility of specific, low-cost interrogation systems with high acquisition rates.