Strain multipoint measurements based on chirped Bragg grating sensors

In this paper, we propose the novel system of multipoint measurement. The sensors of measurements are chirped Bragg grating and the interrogation of sensors is sub-carrier phase. The wavelength division multiplexing technique is used for addressing a network of FBG sensors and the time-division multiplexing technique is used for multipoint measurements. In the system, the modulation frequency of 200 MHz is adopted. The range of dectetion is from 0 to 900 mu epsilon and the resolution is 12 mu epsilon. The time of the sensor response is about Ins.