Patent ID: 11920986
Assignee: TONGJI UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  F  Y | IPC F  G

Claim 3:
4. The sewer pipe inflow and infiltration diagnosis method based on the distributed fiber-optic temperature measurement system according to claim 3, wherein the positive background noise value and the negative background noise value are expressed as follows:, a
     =
     
      
       ❘
       "\[LeftBracketingBar]"
      
      
       
        T
        _
       
       -
       
        T
        max
       
      
      
       ❘
       "\[RightBracketingBar]"
      
     
    
   
  
  
   
    
     b
     =
     
      -
      
       
        ❘
        "\[LeftBracketingBar]"
       
       
        
         T
         _
        
        -
        
         T
         min
        
       
       
        ❘
        "\[RightBracketingBar]"
       
      
     
    
   
  
 

wherein, T denotes an average measured temperature during an observation period; Tmax denotes a maximum measured temperature during the observation period; and Tmin denotes a minimum measured temperature during the observation period.