This device is a whiteness test method for paper pulp and paperboard by combining an integrating sphere spectroscope of ISO method JIS P8148 "Diffuse illumination → 0 degree light reception".
(1) Integrating sphere spectrophotometer body
(2) Control and data processing unit
- WINDOWS specification personal computer
- Liquid crystal color display/color printer
- Measurement method: JIS P8148 reflected light D-0° method, transmission 0°-0 method
- Measurement method: Spectral method using a diffraction grating (grating)
Visible light 400-700nm Measurement of 31 wavelengths with 10nm intervals
- Measurement area: reflection measurement 25mmΦ, transmission measurement 25mmΦ
- Lighting conditions: Integrating sphere (150 mmΦ) method Diffuse lighting → 0 degree light reception (D-0 degree method)
- Light source: Halogen lamp 12V100W 2,000H
- Detection element: Silicon photodiode array 31-channel type
Measurement item
ISO 457R "Whiteness" (by C light 2 degree field of view)
WB=0.847Z (JIS P8123)
WH=100[(100−L) 2 +(a 2 +b 2 )] 1/2
W1 = 3.388-3Y (measurement of whiteness including fluorescence)
Measurement of opacity and yellowness
Tristimulus values X, Y, Z・x-y・L*a*b*・⊿L*⊿a*⊿b*⊿E
Spectral reflectance, spectral transmittance, spectral curve