Patent ID: 11892541
Assignee: SUZHOU PHASERISE TECHNOLOGY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The air-coupled ultrasonic interferometric method according to claim 2, characterized in that: the ultrasonic wave is used for frequency sweep detection, then a two-dimensional diagram is made with a sweeping angular frequency as the abscissa and the integral of the absolute value of a time-domain signal allowing interference to occur as the ordinate, and then a sine wave change curve presented in the two-dimensional diagram is fitted with the sine wave function regression algorithm; the span of the frequency sweep is inversely related to the error of the fitting data; the period of the fitted sine wave function is the difference 2η(f2−f1) between the angular frequencies corresponding to two adjacent phase periods, and the acoustic phase difference ΔΦ is 2π at this time.