Patent ID: 11885607
Assignee: DR. JOHANNES HEIDENHAIN GMBH
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. The device according to claim 8, wherein the coarse position signal is determined according to the relationship:, L
    G
   
   =
   
    
     c
     
      2
      ⁢
      π
      *
      
       f
       PM
      
     
    
    *
    a
    ⁢
    
     sin
     ⁡
     (
     
      
       A
       
        λ
        ⁢
        i
       
      
      
       2
       ⁢
       
        A
        
         λ
         ⁢
         iPM
        
       
        
      
     
     )
    
   
  
  ,
 

in which LG represents the coarse position signal, c represents the speed of light in a measuring medium, fPM represents a modulation frequency, Aλi represents the position phase amplitude for the three wavelengths (i=1, 2, 3), and AλiPM represents the light phase amplitude for the three wavelengths (i=1, 2, 3).