The difference between the spectrophotometer and the colorimeter is based on its measurement principle. There are only two types, one is the tristimulus value type, and the other is the spectroscopic type. The three-stimulus value type instrument is mainly composed of three filters and silicon photocells as three sensors. The structure is relatively simple and the accuracy is not high. It is more suitable for measuring the color difference between different samples, so it is sometimes called a color difference meter. Spectroscopic instruments generally use diffraction gratings or foldback gratings to separate the light at a certain wavelength interval, and then use several sets of sensor arrays for light analysis. Spectroscopic instruments generally have higher accuracy and are more sensitive to color. In addition to measuring color difference, they are also more suitable for measuring the absolute color value of samples.
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