Patent ID: 11960030
Assignee: HEFEI INSTITUTES OF PHYSICAL SCIENCE, CHINESE ACADEMY OF SCIENCES
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 3:
4. The device for real-time measuring the spectrum of airborne hyperspectral imaging LiDAR according to claim 1 wherein the step S1 is as follows:
(a). the formula of return signal power PR (λ, z) according to the hyperspectral LiDAR equation is as follows:, P
            R
          
          ⁡
          
            (
            
              λ
              ,
              z
            
            )
          
        
        =
        
          
            ρ
            0
          
          ⁢
          
            η
            ⁡
            
              (
              λ
              )
            
          
          ⁢
          
            
              Δλβ
              0
            
            ⁡
            
              (
              λ
              )
            
          
          ⁢
          
            
              D
              R
              2
            
            
              8
              ⁢
              
                z
                2
              
            
          
          ⁢
          
            
              
                ɛ
                ⁡
                
                  (
                  λ
                  )
                
              
              ⁡
              
                [
                
                  
                    T
                    atm
                  
                  ⁡
                  
                    (
                    
                      λ
                      ,
                      0
                      ,
                      z
                    
                    )
                  
                
                ]
              
            
            2
          
        
      
    
    
      
        (
        1
        )
      
    
  

(b). the capture card in the processor (15) captures the signal intensity of the reference light (13) through sequential control, and the power spectrum of the reference light (13) detected by the detector is:, P
            Ref
          
          ⁡
          
            (
            λ
            )
          
        
        =
        
          
            ρ
            0
          
          ⁢
          
            η
            ⁡
            
              (
              λ
              )
            
          
          ⁢
          
            Δλɛ
            ⁡
            
              (
              λ
              )
            
          
          ⁢
          
            R
            ⁡
            
              (
              λ
              )
            
          
        
      
    
    
      
        (
        2
        )
      
    
  

R (λ) is the optical efficiency of the reference light during introduction;
In addition, the optical power received by the detector can be further expressed as:, P
            Ref
          
          ⁡
          
            (
            λ
            )
          
        
        =
        
          
            
              I
              Ref
            
            ⁡
            
              (
              λ
              )
            
          
          R
        
      
    
    
      
        (
        3
        )
      
    
  

IRef (λ) is the electrical signal intensity of the reference light (13) in the corresponding channel of the radar system, and R is the responsivity of the detector in the corresponding channel of the radar system;
(c). a corner reflector is adopted to introduce part of the laser light scanning the ground object target (12) through a rotating mirror (14) to the receiving module, at this time the laser power spectrum received by the detector in the radar system is:, P
            Cor
          
          ⁡
          
            (
            λ
            )
          
        
        =
        
          
            
              ρ
              0
            
            ⁢
            
              η
              ⁡
              
                (
                λ
                )
              
            
            ⁢
            
              Δλɛ
              ⁡
              
                (
                λ
                )
              
            
            ⁢
            
              Q
              ⁡
              
                (
                λ
                )
              
            
          
          =
          
            
              
                I
                Cor
              
              ⁡
              
                (
                λ
                )
              
            
            R
          
        
      
    
    
      
        (
        4
        )
      
    
  

Q(λ) is the optical efficiency reflected by the corner reflector that can be accurately detected.