Patent ID: 11900630
Assignee: ZHEJIANG UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G  F | IPC F  G

Claim 0:
1. A method for detecting leakage of a water supply pipe based on ground-penetrating radar three-dimensional image attribute analysis, the method comprising:
step 1 of acquiring ground-penetrating radar original image data of a water supply pipe by longitudinal scanning;
step 2 of de-noising and filtering the acquired original image data;
step 3 of fitting, by interpolation, the image data that has been processed into a three-dimensional data body; and extracting multiple planar or stereo image attributes, and displaying the image attributes by a longitudinal profile, a transverse profile, a horizontal profile, an irregular profile and iso-surface; and
step 4 of identifying leakage positions and scale by multi-attribute comprehensive analysis,
wherein said acquiring ground-penetrating radar original image data in the step 1 comprises: selecting a ground-penetrating radar antenna and pipe axial survey lines according to a burial depth and a pipe diameter;
said acquiring ground-penetrating radar original image data comprises: selecting a ground-penetrating radar antenna and pipe axial survey lines; different pipe burial depths and pipe diameters correspond to ground-penetrating radar antennas with different center frequencies, a radar antenna model for the water supply pipe is calculated according to a pipe burial depth and a pipe diameter, and relations between a radar frequency, a horizontal resolution and a vertical resolution are shown in the following formulas:, Reflection
   ⁢
      
   coefficient
   ⁢
      
   R
  
  =
  
   
    
     
      ε
      1
     
    
    -
    
     
      ε
      2
     
    
   
   
    
     
      ε
      1
     
    
    +
    
     
      ε
      2
     
    
   
  
 

 
  
   Horizontal
   ⁢
      
   resolution
   ⁢
      
   
    R
    f
   
  
  =
  
   
    1
    4
   
   ⁢
   
    
     
      h
      ⁢
      λ
     
     2
    
   
  
 

 
  
   Vertical
   ⁢
      
   resolution
   ⁢
       
   
    R
    v
   
  
  =
  
   
    λ
    8
   
   -
   
    λ
    4
   
  
 

 
  
   Wave
   ⁢
      
   velocity
   ⁢
      
   v
  
  =
  
   
    c
    
     ε
    
   
   =
   
    λ
    ⁢
    f
   
  
 

 
  
   Time
   ⁢
      
   t
  
  =
  
   
    2
    ⁢
    h
   
   v
  
 

and
a position of a pipe axis is determined according to a position of a pipe orifice, and the antenna travels at a constant speed along the pipe axis from a starting pipe orifice to an ending pipe orifice, and then back to the starting pipe orifice;
during a process of the antenna traveling at the constant speed along the pipe axis from the starting pipe orifice to the ending pipe orifice, and then back to the starting pipe orifice, the ground-penetrating radar antenna continuously transmits pulse electromagnetic waves to the water supply pipe as a detection target, and electromagnetic wave signals received by the ground-penetrating radar antenna are used as the ground-penetrating radar original image data.