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-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 20 mm T (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.

ISR-603 Integrating Sphere Attachment (60 mm)

ISR-603 Integrating Sphere Attachment
  • Angle of incident light: 0°
  • Wavelength range: 220 to 2600 nm
  • Maximum size of reflection sample: 70 x 70 x 20 (W x H x T) mm
  • Cell holder for transmission sample: film holder, cuvette holder
  • For use with the UV-3600i Plus
 
Specular Reflectance Measurement is also possible (8° angle)​

ISR-1503 Integrating Sphere Attachment (150mm)

ISR-1503 Integrating Sphere Attachment
  • Angle of incident light: 0°
  • Wavelength range: 200 to 2500 nm
  • Maximum size of reflection sample: 150 x 165 x 10 (W x H x T) mm
  • Cell holder for transmission sample: Film holder
  • For use with the UV-3600i Plus
  • Specular Reflectance Measurement is also possible (8° angle)
 
Note: The optional cuvette attachment is required for transmission measurement of liquid samples. 

ISR-100 Fluorescence Integrating Sphere (100 mm)

ISR-100 Integrating Sphere Attachment
  • Angle of incident light: 0°
  • Wavelength range: 200 to 900 nm
  • Maximum size of reflection sample: 12.5 x 12.5 x 45 (W x D x H) mm
  • Maximum size of solid reflection sample: 35 – 58 mm (H), 3 – 12 mm (T)
  • For use with the RF-6000
  • Measurements: Fluorescence Quantum Yield, Fluorescence Quantum Efficiency

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