Abstract: The concept, main content, solutions, latest research advances of dynamic monitor and diagnosis with distributed fiber Bragg grating (FBG) in mechanical systems at home and abroad are discussed thoroughly. Based on the introduction of the concepts and missions of mechanical system, and the high-performance distributed FBG sensor, the principle and method of the high speed reflected demodulation, the principle and method of distributed sensing and dynamic monitoring, the recognition principle and method of mechanical damage based on distributed measurement data for mechanical system are presented. And also the integration principle and system design method of dynamic monitoring and diagnosis are proposed. Research achievements of the research group in the past 10 years and research advances at home and abroad of fiber sensing technology are summarized for significant mechanical equipment monitoring and diagnosis field.

Key words: Dynamic monitoring, Fault diagnosis, Fiber sensor, Mechanical damage