Piezoelectric crystal plate resonant frequency measurement method

The invention belongs to the field of aeronautical material performance test, and relates to a piezoelectric crystal plate resonant frequency measurement method. According to the method, a short-term high-voltage pulse method is adopted to excite a piezoelectric crystal plate, the piezoelectric crystal plate generates response vibration, a high voltage pulse is used as wideband excitation, the piezoelectric crystal plate responds selectively to vibration, and the vibrational frequency of the piezoelectric crystal plate is the resonant frequency of the piezoelectric crystal plate. According to the method, a pure time domain algorithm is adopted, the method is direct and simple and convenient, is small in interference factor, and high in accuracy. The piezoelectric crystal plate in a certain shape corresponds to more than one resonant frequency. For example, a round crystal plate has a high-frequency thickness mold vibration resonant frequency and a low-frequency radial mold resonant frequency. The method can totally measure the resonant frequency of mold vibration in different directions.