Vibrating wire sensor adaptive frequency sweep excitation method and system based on frequency spectrum feedback

The invention provides a vibrating wire sensor self-adaptive frequency sweeping excitation method and system based on frequency spectrum feedback, and relates to the technical field of engineering monitoring. Three stages of pre-sweep frequency excitation, segmented sweep frequency excitation and compound sweep frequency excitation are designed according to influence factors of excitation waveform, excitation step length, excitation range, excitation times and the like involved in a low-voltage sweep frequency excitation mode. The method comprises the following steps: firstly, primarily judging the quality of instruments through a pre-sweep frequency excitation stage, and screening instruments with poor quality to carry out sectional sweep frequency excitation; after entering a segmented frequency sweep excitation stage, obtaining the most reliable natural vibration signal frequency value by comparing the frequency domain amplitude spectrum conditions of the echo signal in different segmented excitation inter