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A compact fiber bending sensor has been presented by superimposing a uniform fiber Bragg grating (FBG) into a tilted fiber Bragg grating (TFBG). The reflection of FBG is modulated by the same bandwidth of the cladding modes of TFBG, which is sensitive to the bending of fiber. By monitoring the differential Bragg reflection between FBG and TFBG, the sensor is insensitive to ambient temperature changes...
Based on the optical time-domain reflectometry technology and temperature effects of spontaneous Raman back-scattering, the distributed fiber optical temperature measurement system is established. The structure and working principles of the system have been discussed. A circulated demodulation method is proposed. The spatial resolution, temperature resolution and time resolution of the system have...
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