System and method for measuring and tracking resonance frequency

The invention relates to a system and method for measuring and tracking the resonance frequency. The system mainly comprises a computer, a multifunctional data collecting card, a direct numerical frequency synthesizer and a sensor interface circuit. Compared with a traditional phase-locked loop circuit, a phase shifter is eliminated, interference of unnecessary units to signals is reduced, and the accuracy of the signals is improved. According to the system and method, measuring and tracking of the resonance frequency are simplified, the resonance frequency and changes of the resonance frequency can be conveniently observed in real time and automatically stored in a storage device, and the detection process is completely and automatically completed through the system without intervention of a technical person.