Choose Right Geometry to Fulfill Color Measurement Needs

Reviewed by Anurag Mishra (Sr. Technical Consultant)

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Understanding the optical geometry is a significant process that needs to be followed in manufacturing industries and research centers as it has a great impact on the color measurement results. It is necessary to understand how much of light need to illuminate on the sample to detect the sample color to determine the best geometry that fits your basic application requirement, The two common geometries that color measurement instruments utilizes to measure the actual color shade of the products are mentioned below:

  • 45°/0°: This popularly known as Unidirectional System of Illumination. This geometry illuminates the sample from an angle of 45 Degree and detects the reflection of light from 0 degrees. This type of geometrical angle is correlated with the visual perception of human beings and is used to measure the accurate appearance of the sample as they are colors are delicate to surface conditions. For example, The same color when painted with gloss surface appears darker in comparison to the same color of material with a matte 45°/0° geometry is utilized to maintain the color consistency and quality of their appearance and to assemble the color quality of the products with different textures and surface quality.
  • d/8°: This geometry is known as Diffused Illumination System with  Integrated Spherical object where d refers to the diffuse angle. This geometry illuminates the object equally from all the angles and directions and detects the reflected light from an angle of 8o. This geometry is capable enough in measuring the performance of an object in two modes i.e. SCE, specular component excluded or SCI, a specular component included. Both the modes are capable enough in measuring the true colors and quality of the samples and their appearance as well. This geometry is basically used for color formulation and to ensure the color consistency of samples having different textures.

Testronix offers a wide range of color measurement devices that works on these geometries to measure the colors of plastics such as TP 800 Spectrophotometer and other color testers. Spectrophotometers are widely used in plastic industries for best plastic color measurement. The instruments are designed by combining the advanced principle of LED precision spectroscopy. The portable device helps to separate the luminance according to the wavelength interval and comprises of groups of sensor that measures the accurate color of the sample accurately. The instrument helps to measure L x a x b value as well as delta E value of the product and also displays the spectral reflectance curve that easily explains the color matching parameters and calculates real factors of color formulas.

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