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The design principle of the whiteness meter is complicated, and it is difficult for laymen to understand. The whiteness measuring instrument uses an integrating sphere to measure the absolute spectral diffuse reflectance. The light emitted by the tungsten halogen lamp is converted into a blue-violet light by the condenser and the filter, and enters the integrating sphere. After the light is diffusely reflected on the inner wall of the integrating sphere, the light is irradiated. The test mouth of the sample, the light reflected by the sample by the condenser, light bar filter group after the silicon photocell received, converted into electrical signals. Another silicon photocell receives the base signal inside the sphere. The two electrical signals are respectively amplified, mixed, and the result of the measurement is digitally displayed.
The whiteness measuring instrument adopts d/o illumination observation geometry (ISO2469). The diameter of the diffuser ball is φ150mm, and a light absorber is provided to eliminate the influence of the specular reflection light of the sample. The spectral power distribution of the R457 brightness optical system has a peak wavelength of 457 nm and a full width at half maximum of 44 nm. The RY optical system conforms to GB3979-83: Object Color Measurement Method. . The arithmetic mean of a series of measurements can be determined multiple times and given. With power-off protection, zero adjustment, alignment, and standard volume data, even if power is lost for a long period of time, it protects data from loss.
The main application industry of whiteness measuring instrument is the determination of the whiteness of various objects such as paper, cotton, chemical fiber, textiles, plastics, ceramics, starch, salt, etc. It is also possible to measure the optical properties such as the opacity of thin-sheet materials, and analyze the sample materials. Whether it contains fluorescent brighteners, and can measure the fluorescent whiteness produced by fluorescence emission, that is, the degree of whitening.