Patent ID: 11921254
Assignee: SOREQ NUCLEAR RESEARCH CENTER
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. The seismic surveying system according to claim 1, wherein said processor further determines a distance between said imager and each of said plurality of laser spots, wherein said distance between said imager and a laser spot is determined from shift of a speckle pattern corresponding to said laser spot, said shift of a speckle pattern caused by a known angular displacement of a laser beam corresponding to said laser spot, and
Wherein said distance is determined according to:, S
  ≅
  
   
    M
    P
   
   ·
   α
   ·
   
    (
    
     
      Z
      ·
      
       
        L
        -
        R
       
       
        L
        -
        Z
       
      
     
     +
     R
    
    )
   
  
 

where S is a speckle pattern shift in units of pixels, M is a magnification of said imager, P is a size of a pixel, α is an angle between directions of said multibeam laser source, Z is a range from a waist of said beam to a rotation axis of said multibeam laser source, L is distance between said imager and said instantaneous area of interest, and R is a range between said imager and a focal plane of said imager.