800nm FBG sensing interrogation system based on tilted FBG

Abstract:

An 800 nm band fiber Bragg grating sensing interrogation system using tilted FBG as the core wavelength division component is presented. A charge coupled device (CCD) linear array is put on the focal plane of the lens to detect the light. TFBG is used to tap light out of the fiber core to fiber cladding. The sensing wavelength is 795 to 830 nm, with accuracy of 20 pm and scan speed 100Hz. Using FBG sensor, we achieve the temperature sensitivity of 1.8 °C and strain sensitivity of 18 μ ɛ. This work is suppoted by National Nature Science Foundation of China(60577018),the 863 National High Technology Prograrm of china (Grant No.2006AA01Z217),and the open Project foudation of key laboratory of Opto-eletronic Infr mation Science and Technology luinistry of Eolucation in Nankai university