Diffuse Reflectance Measurement

Diffuse Reflectance Measurement
 

Since light cannot penetrate opaque (solid) samples, it is reflected on the surface of the samples. As shown in the figure, incident light reflected symmetrically with respect to the normal line is called "specular reflection," while incident light scattered in different directions is called "diffuse reflection."

 
Measurement of Diffuse Reflection Not Including Specular Reflection  Using an Integrating Sphere
 
 
 
Measurement of Diffuse Reflection Including Specular Reflection Using an Integrating Sphere
 
 
 
Reflection Spectrum of Paint Film
 
 

With integrating spheres, measurement is performed by placing the sample in front of the incident light window, and concentrating the light reflected from the sample on the detector using a sphere with a barium sulfate-coated inside. The obtained value becomes the reflectance (relative reflectance) with respect to the reflectance of the reference standard white board, which is taken to be 100%.
When light is directed at the sample at an angle of 0°, specular reflected light exits the integrating sphere and is not detected. As a result, only diffuse reflected light is measured. Models of integrating spheres with different angles of incidence are available, enabling measurement of both specular and diffuse reflected light in instances such as these.

 

ISR-240A Integrating Sphere Attachment

ISR-240A Integrating Sphere Attachment
 
  • Angle of incident light: 0°
  • Wavelength range: 240 to 800 nm
  • Maximum size of reflection sample:40 mm W x 70 mm H x 10 mm T or 70 mm W x 70 mm H x 5 mm T
  • Cell holder for transmission sample:with holder for 10 mm square cell (excluding cell), 2 sample plates for BaSO4 standard white board, 2 plates for powder samples
  • For UV-2450/2550/3600
 

ISR-2200 Integrating Sphere Attachment

ISR-2200 Integrating Sphere Attachment

Diffuse and spectral reflection can be measured without using special attachments by combining a 0°/8° incident integrating sphere with the S/R exchange function of the spectrophotometer. Since the size of the flux of the reflection measuring unit can be altered, micro samples of with a minimum flux size of 2 x 3 mm can be measured. The flux size of the transmission measuring unit also can be closed down to about 3 x 3 mm.

 
  • Angle of incident light: 0°/8°
  • Wavelength range: 220 to 850 nm
  • Maximum size of reflection sample: 70 mm W x 70 mm H x 20 mm T (0° angle of incidence side), 70 mm W x 70 mm H x 12 mm T (8° angle of incidence side)
  • Cell holder for transmission sample: with holder for 10 mm square cell (excluding cell), 2 sample plates for BaSO4 standard white board, 2 plates for powder samples
  • For UV-2450/2550/3600

ISR-3100 Integrating Sphere Attachment

ISR-3100 Integrating Sphere Attachment
 
  • Angle of incident light: 0°/8°
  • Wavelength range: 220 to 2600 nm
  • Maximum size of reflection sample: about 100 mm dia. x 15 mm T
  • Cell holder for transmission sample: with holder for 10 mm square cell (excluding cell), 2 sample plates for BaSO4 standard white board, 2 plates for powder samples
  • For UV-3600
 

ISR-2600/ISR-2600Plus Integrating Sphere Attachment

 
  • Angle of incident light: 0°/8°
  • Measurement wavelength range: ISR-2600 220 to 850 nm, ISR-2600Plus 220 to 1400nm
  • Maximum size of reflection sample: 70 mm W x 70 mm H x 20T mm (0° angle of incidence side), 70 mm W x 70 mm H x 12 mm T (8° angle of incidence side)
  • For UV-2600
 

Note: ISR-2600 can be used with UV-2700.

 

LISR-3100 150mm dia. Integrating Sphere Attachment

LISR-3100 150mm dia. Integrating Sphere Attachment

This attachment is used to measure the transmission and reflectance spectra of solid samples, such as powder, paper and cloth. Stable measurement is possible regardless of the state of the sample surface.

 
  • Angle of incident light: 7°
  • Wavelength range: 240 to 2400 nm
  • Maximum size of reflection sample:about 150 mm W x 170 mm H x 30 mm T
  • For UV-3600

For Research Use Only. Not for use in diagnostic procedures.

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