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

Claim 7:
8. The air-coupled ultrasonic interferometric method according to claim 7, characterized in that: when the ultrasonic frequency changes, the wavelength and phase will change; the relationship between the difference between the phases before and after the change and the difference between the frequencies before and after the change is, Δ
    ⁢
    Φ
  
  =
  
    
      
        2
        ⁢
        
          
        
        ⁢
        π
        ⁢
        
          
        
        ⁢
        L
      
      c
    
    ⁢
    Δ
    ⁢
    
      f
      .