Patent ID: 11867562
Assignee: VISERA TECHNOLOGIES COMPANY LIMITED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. The optical device as claimed in claim 15, wherein emission of signals of the modulated sine wave light is synchronized with operation of a readout circuit, and the signals are read at various phase delays by the readout circuit and converted into digital signals via an A/D converter, and a photoluminescence lifetime of the photon conversion thin film is calculated using equations (II) and (III) and converted into a temperature map, wherein, Δϕ
     =
     
      arc
      ⁢
        
      tan
      ⁢
        
      
       (
       
        
         
          I
          0
         
         -
         
          I
          2
         
        
        
         
          I
          3
         
         -
         
          I
          1
         
        
       
       )
      
     
    
   
   
    
     (
     II
     )
    
   
  
 

in equation (II), I0 represents signal intensity at 0° phase delay, I1 represents signal intensity at 90° phase delay, I2 represents signal intensity at 180° phase delay, I3 represents signal intensity at 270° phase delay, and Δφ represents phase difference between the light source and photon emitted from the photon conversion thin film, and, τ
     =
     
      
       tan
       ⁢
         
       
        (
        
         Δ
         ⁢
         ϕ
        
        )
       
      
      
       2
       ⁢
       π
       ⁢
       v
      
     
    
   
   
    
     (
     III
     )
    
   
  
 

in equation (III), Δφ represents the phase difference between the light source and photon emitted from the photon conversion thin film, ν represents light source modulation frequency, and τ represents the photoluminescence lifetime.