Ultrasonic scalpel head vibration energy efficiency evaluation method based on laser vibration measurement

The invention belongs to the field of vibration test technology and vibration signal analysis, and particularly relates to an ultrasonic scalpel head vibration energy efficiency evaluation method based on laser vibration measurement. According to the method, sampling parameters are set according to a given value fn of the vibration frequency of an ultrasonic knife head, and based on the set sampling parameters, a laser vibration meter is adopted to collect axial vibration signals of the knife head when the current ultrasonic knife works; performing power spectrum analysis on the collected vibration signals to obtain a power spectrogram; selecting a maximum frequency peak value near a given value of the vibration frequency fn of the ultrasonic tool bit in the power spectrogram, and recording horizontal and vertical coordinate values (fnmax, Pnmax) of the peak value; drawing a straight line of which the ordinate is Pnmax-3dB in the power spectrogram to obtain two frequency values f1 and f2 corresponding to the