What is the Principle of Colorimeter?

From:Linshang Time:2020/06/12 10:00:00 Browse:100

What does chromatic aberration mean? How to explain the color difference of the product? Color is an observer's subjective evaluation. Even if it is the same color, everyone's evaluation of the color is different. If you want to accurately evaluate the color difference of the product, you need to pass a unified standard for testing.

1. What does chromatic aberration mean?

Simply put, color difference refers to the difference in color. There are many factors for this difference. According to the optical principles of imaging, the chromatic aberration can be divided into seven geometric aberrations, such as spherical aberration, coma, astigmatism, field curvature, distortion, positional chromatic aberration and magnification chromatic aberration.

In daily life, we often say that the color difference refers to the phenomenon of inconsistent colors when the human eye observes the product. For example, in the textile industry, fabrics of the same color are dyed differently in different batches; or in the printing industry, the color difference between printed products and standard samples provided by customers.

In industry and commerce, accurate assessment of product color difference is a very important part. However, various factors such as the light source, the viewing angle and the observer's own conditions during visual color measurement may cause differences in color evaluation. In order to achieve a unified standard for color difference assessment, the International Commission on Illumination (CIE) has recommended a series of measurement standards. The basis of modern color difference evaluation is to use a colorimeter or a spectrophotometer to evaluate the color difference of the product through accurate numerical values according to the standard color difference formula provided by CIE.

2. How to explain the color difference?

In the process of industrial production, the problem of products color difference is very common. In order to adapt to the increasingly fierce market competition environment, manufacturers must strictly control the color difference of products and make a reasonable explanation for the problem of color difference, so as to ensure the product quality.

3. Principle of colorimeter

With the continuous development of science and technology, various types of color difference verification instruments are now increasingly developed, which can effectively help companies achieve color difference management and control. The colorimeter can accurately assess the degree of color difference between two products. It automatically compares the color difference between the sample and the tested product. Then outputs the three sets of CIE-LAB data and the four groups of ΔE, ΔL, Δa, Δb after colorimetry color difference data.

The principle of its application is to measure the tristimulus value xyz of the sample through integration. Then calculate the chromaticity coordinates and other parameters of the sample. Usually the filter is used to cover the detector. The relative spectral sensitivity S(λ) of the detector is corrected to the spectral tristimulus values x(λ), y(λ), z(λ) recommended by CIE. When such three photodetectors are used to receive light stimuli, the tristimulus values X, Y, Z of the sample can be measured with one integration. The filter needs to meet the Luther condition to accurately match the light detector.

Tags: colorimeter
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