Patent ID: 11874217
Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. The device according to claim 8, wherein said pyramids are arranged such that two pyramids, situated one following the other along a longitudinal axis (x), are spaced apart, along the longitudinal axis (x), by a distance di=xi+1−xi which is equal, at least within 20%, to the following quantity di,opt:, d
    
      i
      ,
      opt
    
  
  =
  
    H
    [
    
      
        1
        
          tan
          ⁢
          
            
          
          ⁢
          α
        
      
      +
      
        tan
        [
        
          α
          +
          
            
              sin
              
                -
                1
              
            
            [
            
              cos
              [
              
                
                  α
                  +
                  
                    
                      tan
                      
                        -
                        1
                      
                    
                    (
                    
                      
                        
                          W
                          ·
                          tan
                        
                        ⁢
                        
                          
                        
                        ⁢
                        α
                      
                      
                        
                          
                            x
                            i
                          
                          ⁢
                          tan
                          ⁢
                          
                            
                          
                          ⁢
                          α
                        
                        +
                        H
                      
                    
                    )
                  
                
                n
              
              ]
            
            ]
          
        
        ]
      
    
    ]
  

where
the coordinates xi and xi+1 denote the respective positions, along the longitudinal axis (x), of the two summits of said two pyramids,
the longitudinal axis (x), which is orthogonal to said transversal axis (y) and which is contained in the average plane of said inner face, has an origin which is situated upright a point of injection of said light radiation,
H is the depth of the pyramids, measured perpendicularly to the average plane of said inner face, and
W is the distance between the point of injection of the light radiation and the average plane of said inner face, measured perpendicularly to said average plane.