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

Claim 5:
6. The optical fiber sensing system for temperature and salinity synchronous measurement according to claim 1, wherein the first interference spectra envelope is:, {
  
   
    
     
      
       
        I
        
         
          e
          ⁢
          n
         
         -
         
          1
          ⁢
          2
         
        
       
       (
       λ
       )
      
      =
      
       
        E
        
         1
         ⁢
         2
        
       
       ⁢
       
        cos
        ⁡
        (
        
         
          4
          ⁢
          π
          ⁢
          
           n
           1
          
          ⁢
          
           L
           1
          
         
         
          
           M
           
            1
            ⁢
            2
           
          
          ⁢
          λ
         
        
        )
       
      
     
    
   
   
    
     
      
       M
       
        1
        ⁢
        2
       
      
      =
      
       
        
         FSR
         1
        
        
         
          ❘
          "\[LeftBracketingBar]"
         
         
          
           FSR
           1
          
          -
          
           FSR
           2
          
         
         
          ❘
          "\[RightBracketingBar]"
         
        
       
       =
       
        
         
          n
          1
         
         ⁢
         
          L
          1
         
        
        
         
          ❘
          "\[LeftBracketingBar]"
         
         
          
           
            n
            1
           
           ⁢
           
            L
            1
           
          
          -
          
           
            n
            2
           
           ⁢
           
            L
            2
           
          
         
         
          ❘
          "\[RightBracketingBar]", wherein Ien-12(λ) is the first interference spectra envelope, E12 is an amplitude of the interference spectra envelope, and M12 is a magnification of a vernier effect between the first interferometer and the second interferometer; and
the second interference spectra envelope is:, {
  
   
    
     
      
       
        I
        
         
          e
          ⁢
          n
         
         -
         
          1
          ⁢
          3
         
        
       
       (
       λ
       )
      
      =
      
       
        E
        
         1
         ⁢
         3
        
       
       ⁢
       
        cos
        ⁡
        (
        
         
          4
          ⁢
          π
          ⁢
          
           n
           1
          
          ⁢
          
           L
           1
          
         
         
          
           M
           
            1
            ⁢
            3
           
          
          ⁢
          λ
         
        
        )
       
      
     
    
   
   
    
     
      
       M
       
        1
        ⁢
        3
       
      
      =
      
       
        
         FSR
         1
        
        
         
          ❘
          "\[LeftBracketingBar]"
         
         
          
           FSR
           1
          
          -
          
           FSR
           3
          
         
         
          ❘
          "\[RightBracketingBar]"
         
        
       
       =
       
        
         
          n
          1
         
         ⁢
         
          L
          1
         
        
        
         
          ❘
          "\[LeftBracketingBar]"
         
         
          
           
            n
            1
           
           ⁢
           
            L
            1
           
          
          -
          
           
            n
            3
           
           ⁢
           
            L
            3
           
          
         
         
          ❘
          "\[RightBracketingBar]", wherein Ien-13(λ) is the second interference spectra envelope, and E13 is the amplitude of the interference spectra envelope; and M13 is a magnification of the vernier effect between the first interferometer and the third interferometer, and wherein FSR1, FSR2 and FSR3 represent a free spectral region of the first, second and third interferometers, respectively.