Patent ID: 11940276
Assignee: GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. The process of claim 10, wherein, in converting the fringe images into the interferometric phase map, the interferometric phase map f(xi, yj) is determined by, ϕ
    ⁡
    (
    
     
      x
      i
     
     ,
     
      y
      l
     
    
    )
   
   =
   
    
     
      tan
      
       -
       1
      
     
     [
     
      
       
        
         P
         2
        
        (
        
         
          x
          i
         
         ,
         
          y
          j
         
        
        )
       
       -
       
        
         P
         4
        
        (
        
         
          x
          i
         
         ,
         
          y
          i
         
        
        )
       
      
      
       
        
         P
         3
        
        (
        
         
          x
          i
         
         ,
         
          y
          j
         
        
        )
       
       -
       
        
         P
         1
        
        (
        
         
          x
          i
         
         ,
         
          y
          j
         
        
        )
       
      
     
     ]
    
    +
    
     n
     ⁢
     π
    
   
  
  ,
 

wherein xi, yj are pixels of the interferometric phase map; and P1, P2, P3, and P4 are respectively population ratios of a first fringe image, a second fringe image, a third fringe image, a fourth fringe image of the plurality of fringe images.