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

Claim 6:
7. The sewer pipe inflow and infiltration diagnosis method based on the distributed fiber-optic temperature measurement system according to claim 6, wherein the probability distribution proportion of the preset background noise value is expressed as follows:, P
   φ
  
  =
  
   
    (
    
     k
     
      k
      
       t
       ⁢
       o
       ⁢
       t
       ⁢
       a
       ⁢
       l
      
     
    
    )
   
   ×
   1
   ⁢
   0
   ⁢
   0
   ⁢
   %
  
 

wherein, k denotes a number of times that an element in a temperature difference matrix Γ(t,l−1) appears within (−φ,φ), Γ(t,l−1)=T(t,l)—T(t,l−1); ktotal denotes a total number of positive and negative temperature differences between the two adjacent temperature measurement points in a pipe space during the observation period, ktotal=m×(n−1); m denotes a number of rows in the water temperature matrix T(t,l); and n denotes a number of columns in the water temperature matrix T(t,l).