Patent ID: 11965821
Assignee: GUANGDONG OCEAN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The optical fiber sensing system for temperature and salinity synchronous measurement according to claim 1, wherein the interference spectra of the first interferometer, the second interferometer and the third interferometer are as follows:, I
       
        1
        ⁢
        2
       
      
      (
      λ
      )
     
     =
     
      
       I
       1
      
      +
      
       I
       2
      
      -
      
       2
       ⁢
       
        
         
          I
          1
         
         ⁢
         
          I
          2
         
        
       
       ⁢
       cos
       ⁢
       
        (
        
         
          4
          ⁢
          π
          ⁢
          
           n
           1
          
          ⁢
          
           L
           1
          
         
         λ
        
        )
       
      
     
    
   
  
  
   
    
     
      
       I
       
        3
        ⁢
        4
       
      
      (
      λ
      )
     
     =
     
      
       I
       3
      
      +
      
       I
       4
      
      -
      
       2
       ⁢
       
        
         
          I
          3
         
         ⁢
         
          I
          4
         
        
       
       ⁢
       cos
       ⁢
       
        (
        
         
          4
          ⁢
          π
          ⁢
          
           n
           2
          
          ⁢
          
           L
           2
          
         
         λ
        
        )
       
      
     
    
   
  
  
   
    
     
      
       I
       
        5
        ⁢
        6
       
      
      (
      λ
      )
     
     =
     
      
       I
       5
      
      +
      
       I
       6
      
      -
      
       2
       ⁢
       
        
         
          I
          5
         
         ⁢
         
          I
          6
         
        
       
       ⁢
       cos
       ⁢
       
        (
        
         
          4
          ⁢
          π
          ⁢
          
           n
           3
          
          ⁢
          
           L
           3
          
         
         λ
        
        ), wherein I12(λ) is the interference spectrum of the first interferometer; I34(λ) is the interference spectrum of the second interferometer; I56(λ) is the interference spectrum of the third interferometer; I1 and I2 are light intensities of two beams of the reflected light of the first interferometer, respectively; I3 and I4 are light intensities of two beams of the reflected light of the second interferometer, respectively; I5 and I6 are light intensities of the two beams of the reflected light of the third interferometer, respectively; L1, L2 and L3 are cavity lengths of the first interferometer, the second interferometer and the third interferometer, respectively; n1, n2 and n3 are refractive indices of intracavity media of the first interferometer, the second interferometer and the third interferometer, respectively; and A is a wavelength of incident light.