Interrogation Project for Encoding Fiber Bragg Grating Sensor Array

The construction of the encoding fiber Bragg grating sensor array and the characteristic of its sensing signal are introduced. A new type of interrogator for encoding fiber Bragg grating sensor array, which has a comb structure and employs the logarithm of the output ratio between the adjacent two channels of arrayed waveguide grating to determine the measured wavelength,is proposed. The paper demonstrates the feasibility of this interrogation project in theory in the cases of background reflectance and the ideal case respectively and analyzes the error caused by the noise. This system is suitable for interrogating a large number of wavelength information, and can carry out a fast and simultaneous interrogation of multiple wavelengths without any mechanically moving parts.