The powder standard white plate specified in this standard can be used directly for colorimetric and photometric measurements, and can also be used to calibrate working standards. The measurement of colorimetric and photometric values ​​is based on an ideal fully reflective diffuser. It is usually performed by comparing the sample with a standard white plate or a working standard white plate. A standard white plate with known spectral reflectance and tristimulus values ​​should be used for measurement. The standard white plate specified in this standard is pressed from powdered materials such as magnesium oxide or barium sulfate, and its absolute spectral reflectance is guaranteed by the performance of the manufacturing material and the pressing technology. GB/T 9087-1988 Powder standard white plate for colorimetric and photometric measurements GB/T9087-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB9087-1988
Powder Standard White Plate for Colorimetry and Photometry 1988-12-01
State Administration of Building Materials Industry
Page 1
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《Powder Standard White Plate for Colorimetry and Photometry》Material
9087-1988
1 Definition and Symbols
2 Technical Requirements
3 Production of Standard White Plate,
4 Instruments and Measurement Techniques| |tt||5 Certificates and Marks
6 Powder Packaging, Storage and Transportation
(Reference)
Appendix A Preparation Equipment and Operation Procedures of Powder Standard White Plate 11
Additional Notes:
Powder Standards for Chromaticity and Photometric Measurement
9087-1988
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The powder standard white plate specified in this standard can be used directly for chromaticity and photometric measurement, and can also be used to calibrate working calibration charts
The measurement of chromaticity and photometric is based on an ideal fully reflecting diffuser. It is usually carried out by comparing the sample with a standard white plate or a working standard white plate. The standard white plate with known spectral reflectance and tristimulus values ​​should be used for measurement. The standard white plate specified in this standard is made of powdered materials such as magnesium oxide or barium sulfate, and its absolute spectral reflectance is guaranteed by the performance of the material and the pressing technology. Chromaticity and light room
white plate of powder standard
9087-1988
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1 Definitions and symbols
1.1 Perfectly reflecting diffuser
The spectral reflectance of the entire visible light band is 1, and the brightness distribution is independent of direction. inoaec.coi
1.2 Spectral reflectance symbol: p (y)
The ratio of the reflected flux of the sample to the incident flux within the range of 2n under the irradiation of light with a wavelength of i (nm). 1.3 Spectral radiance factor symbol: β (y) The spectral reflectance factor detected when the sample is in a given principal direction and the solid angle is close to 0 under the irradiation of light with a wavelength of Y (nm).
Quantity of light
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2 Technical requirements
2.1 Magnesium oxide or sulfuric acid powder produced specifically for national physical standards is used as the material for making standard whiteboards. The spectral reflectance of both powders is above 95.0%. The reflectance extreme value difference si
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of the same batch of powder materials in the wavelength range of 380-780nm is not more than 3.0%.
2.2 The standard white plate specified in this standard is made of magnesium oxide or barium sulfate powder pressed in a metal sample box to form a circular plate with a thickness of more than 5mm and a diameter of not less than 25mm. 2.3 The surface of the pressed powder standard white plate should be flat, without texture, gloss, and stain. There should be no powder chips falling from the surface of the powder standard plate when it is vertical or inverted. The bulk density of the standard powders pressed with the same batch number should be the same. "White Plate"
Colorimetric and Photometric Measurement of Powder Standards
9087-1988
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3 Preparation of Standard White Plate
3.1 This standard specifies the use of a powder sample press to press the powder standard white plate. The preparation steps are shown in Appendix A. 3.2 Pressed powders must not be reused
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3.3 If magnesium oxide or sulfuric acid lock powders are agglomerated, they can be placed in a mortar that does not pollute the powders, ground and then used. 3.4 Since barium sulfate powder is very sticky, if it sticks to glass when pressing whiteboard, it can be dried in an oven at 105-110℃, placed in a desiccator, cooled to room temperature, and ground before use. 3.5 The pressed standard whiteboard should be stored in a desiccator away from light. If there is no pollution or damage, it can be used repeatedly. Powder Standard
Whiteboard
Colorimetric and Photometric Meters
9087-1988
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4.1 Instruments and Lighting Observation Conditions
4 Instruments and Measurement Techniques
4.1.1 The reflectance measurement specified in this standard must be performed using a spectrophotometer, which must meet the following conditions: 4.1.1.1 The wavelength range is 380-780nm. 4.1.1.2 The passband half width of the spectrophotometer should be within 5.0nm. 4.1.1.3 The photometric accuracy is within 0.5% at full scale within the photometric range. 4.1.1.4 The deviation between the nominal wavelength of the instrument and the actual wavelength does not exceed 0.5nm 4.1.1.5 The resolution of the spectrophotometer is not greater than 0.1%. 4.1.2 The optical geometric conditions of illumination and detection shall be in accordance with Chapter 5 of GB3918-83 "Standard Illuminants and Illumination Observation Conditions", which stipulates the use of 0/d or d/0. Note: For diffuse reflectance standard white plates, the spectral reflectance P (Y) and the spectral radiance factor β (Y) are equal in value. ? 4.2 Measurement of spectral reflectance and calculation of tristimulus values ​​4.2.1 The measurement of spectral reflectance shall be carried out in accordance with GB3979-83 "Measurement of Object Color". 4.2.2 The measurement wavelength range is 380780nm, and the wavelength interval is 5nm or 10nm. 4.2.3 The calculation of tristimulus values ​​X, Y, and Z shall be carried out in accordance with GB3979. 4.2.4 For the powder standard white plate specified in this standard, the reflectance of other wavelengths can be calculated by interpolation, and its uncertainty is within 0.1%.
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Chroma and Light
Whiteboard)
9087-1988
5 Certificate and Mark
5.1 The certificate shall be issued by a unit authorized by the state. 5.2 The certificate shall at least list the reflectance standard values ​​at wavelengths of 380, 400, 420, 450, 457, 500, 550, 600, 700 and 780nm, 2° field C illuminant and 10° field D65, and the three stimulus values ​​X, Y, Z of the illuminant. 5.3 Mark
The two powders of this standard must be clearly marked with the special mark GSBA67, and indicate the number, batch number, test number, test date and test conditions.
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9087-1988
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6 Powder Packaging, Purchase, Storage and Transportation
6.1 The packaging bottle must be sealed, with a label and certificate attached, and the bottle is covered with a plastic bag to prevent moisture. 6.2 Be careful to prevent moisture during storage and transportation. ww.
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Powder Rental
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9087-1988
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Appendix A Equipment and Operation Procedures for Making Powder Standard Whiteboard (Reference) There are many types of powder standard whiteboard presses. This standard recommends the use of HY-3 constant pressure powder press (patent number: CN86205498). This press has a simple structure and is easy to operate, and can meet the requirements of pressing powder standard whiteboards. A.1 The structure of the HY-3 type constant pressure powder sample press is shown in Figure 1. (Figure omitted) A.2 The working surface of the glass plate (4) facing the pressed powder is a rough surface (it has been ground with W103031/2 diamond sand with a particle size of less than 5μ and etched with dilute hydrofluoric acid). A.3 Operation steps:
A.3.1 Place the rough surface of the clean glass plate (4) on the sample box (1) and press it with the pressure cover (5) to tighten it. Turn it 180° and place it on the table with the mouth facing up; A.3.2 Add the powder sample to be pressed into the sample box, preferably full. Let it fall freely 20 times at about 1cm above the table to allow the powder sample to fill the sample box. A.3.3 Place the pressing block (2) on top of the powder, then screw the sample press nut onto the sample box, rotate it clockwise for 2 to 3 turns, and then rotate the handle (7) clockwise to apply pressure on the sample through the screw. When the pressure reaches a certain value, the handle will slide. When a sound is heard, it means that the pressure is automatically stopped. During the pressing process, the two joints of the handle must not be loose. A.3.4 Rotate the handle counterclockwise for 2 to 3 turns, then rotate counterclockwise to remove the sample press nut (6) and take out the pressing block. Screw the bottom cover (8) onto the sample box to press the powder sample and tighten it. A.3.5 Turn the sample box 180°, press the cover (5) down, and take out the glass plate (4). This completes the pressing of the powder standard white plate.
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Powder Standards for Chromaticity and Glossiness Measurement
9087-1988
Additional Notes:
This standard was proposed by the National Whiteness Standard Sample Standardization Technical Working Group and is under the jurisdiction of the Standardization Institute of the State Administration of Building Materials Industry.
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This standard was drafted by the Standardization Institute of the State Building Materials Industry Bureau, China Institute of Metrology, Zhejiang University, and Beijing Chemical Plant.
Drafters of this standard: Wang Jixian, Teng Xiujin, Chen Kezhong, Li Jianmei
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9087-1988
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