Patent ID: 11874113
Assignee: ZHEJIANG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A method for detecting an angular velocity by using the bidirectional microwave-over-fiber resonant system based on the circulator structure according to claim 1, comprising steps of:
Step 1: working light in the clockwise direction passing through the clockwise ring resonant cavity and the clockwise regenerative mode-locked structure, so as to obtain a stable output at a frequency f1 by the third microwave power divider (47);
working light in the counterclockwise direction passing through the counterclockwise ring resonant cavity and the counterclockwise regenerative mode-locked structure, so as to obtain a stable output at a frequency f2 by the second microwave power divider (46);
Step 2: generating opposite Sagnac effects in the sensing ring interferometer structure (29) by the working light in the clockwise direction and the working light in the counterclockwise direction, and detecting a frequency difference between the frequency f1 and the frequency f2 obtained in step 1 as a beat frequency, by the frequency difference detection unit (48), wherein the frequency difference is recorded as Δf;
Step 3: obtaining a rotational angular velocity Ωr by a following formula:, Ω
      r
    
    =
    
      
        
          λ
          ⁢
          
            
          
          ⁢
          L
        
        
          4
          ⁢
          S
        
      
      ⁢
      
        
          Δ
          ⁢
          
            
          
          ⁢
          f
        
        
          
            G
            1
          
          +
          
            G
            2
          
        
      
    
  
  ,

wherein S is an area enclosed by the fiber sensing ring in the sensing ring interferometer structure, λ is a wavelength corresponding to the frequency f1 or the frequency f2, and L is a total fiber length of the fiber sensing ring; G1 is a gain generated due to sensing to the Sagnac effect of two paths with perpendicular polarization states after the working light in the clockwise direction enters the fiber sensing ring; and G2 is a gain generated due to sensing to the Sagnac effect of two paths with perpendicular polarization states after the working light in the counterclockwise direction enters the fiber sensing ring.