Patent ID: 11963760
Assignee: RICOH COMPANY, LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 19:
20. A measuring method comprising:
emitting light to make the light including a wavelength equal to or greater than 7 μm and equal to or less than 12 μm incident on a total reflection plane that an object to be measured contacts;
detecting light intensity of the light reflected by the total reflection plane,
outputting absorbance data related to absorbance in the object to be measured, based on the light intensity detected by a sensor; and
outputting live-subject information that is information about a live subject, based on the absorbance data,
wherein an equation, arc
   ⁢
   
    sin
    ⁡
    (
    
     
      n
      ⁢
      2
     
     
      n
      ⁢
      1
     
    
    )
   
  
  <
  
   θ
   ⁢
   c
  
  <
  
   
    arc
    ⁢
    
     sin
     ⁡
     (
     
      
       n
       ⁢
       2
      
      
       n
       ⁢
       1
      
     
     )
    
   
   +
   
    5.
       
    [
    DEG
    ]
   
  
 

is satisfied, where
n1 denotes a refractive index of a base material of a total internal reflection prism for the light,
n2 denotes a refractive index of the object to be measured and n2 takes a value 1.32 or 1.44, and
θc denotes an incident angle of a center of light flux emitted from a light source.