Optical fiber sensor technology is more and more widely applied in the health monitoring testing of the major projects and infrastructure, because its sensing elements possess characteristics like the small size, high durability, absolute measurement and distributed monitoring. With the development of the optical fiber communication technology, several different kinds of passive devices appear continuously. Fiber Bragg Grating (FBG for short) develops continuingly and speedily in the field of optical fiber communication and sensing technology, owing to its good properties, such as low insertion loss, wavelength absolute coding, being independence on polarization, the flexible adjustment of wavelength and bandwidth and easily connect to fiber. But Fiber Bragg Grating is sensitive about two parameters — the changing temperature and the outside strain. Therefore, cross sensitivity becomes the hot issue. This paper will introduce the temperature compensation technology of the strain monitoring system for a quasi-distributed Fiber Bragg Grating.

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