Geometric conditions for LED illumination observation

Nowadays, many of the precision colorimeter market use LED combination as the illumination source to form the illumination path. For all products of Sanken, this kind of light source system is adopted. The use of LED blue excitation as a light source can make the illumination system relatively stable and is not easily interfered by external factors.

The measuring system of the precision colorimeter is very important. The angle at which the product is illumined at the angle and the angle at which it is refracted is related to the final evaluation of the color of the product. Therefore, it is almost necessary to understand the illumination of the precision colorimeter. It helps us to better use and analyze the data results of precision colorimeter.

We all know that for a precision color difference meter lighting system can be said to be the core technology, generally a precision color difference meter consists of lighting system, sensor, integrating sphere, etc., it can be said that each part is the focus. Here we talk about the geometric conditions of illumination observation. We know that the color data measured by the precision chromatic aberration meter is different, so we must understand the different effects of different illumination observation angles.

The above figures are the most observation angles that our precision colorimeter uses at the most, and there is no more explanation here. The schematic gives a geometrical view of the four standard illumination viewing angles. To measure its reflection factor.

According to the color difference calculation of common precision colorimeter, XYZ system colorimetry

Absolute tristimulus values: XL, YL, ZL, Y, X, L

Tricolor values: X, Y, Z


Y=100YL/YLP=100L, L


The angle P is the value of the complete diffuser, Y is the brightness factor, and the percent chromaticity coordinates: X, Y, Z





Commonly used variables: X, Y, Z, L

X, Y, Y, L

X, Y, L

Characteristics of X, Y chromaticity diagram

There is no negative value, the curve is the line trajectory

SE·X=1/3 Y=1/3

Brightness changes, X, Y are unchanged

White, gray, W value is the same, orange and brown can be drawn at the same point 0, additive color mixture includes C1 and C2, C1 is located on the line connecting C1 and C2.

All colors are located in the spectral line trajectory and the purple trajectory.

The additive color mixture of the red, green, and blue primary colors only matches the color of the triangular regions formed by the primary colors RGB three and chromaticity.

The color outside the triangle needs a negative value of one or two colors.

The precision color difference meter uses the optical geometric calculation method of the illumination and the observation angle to calculate the unique corresponding point on the curve line trajectory to calculate the color value. Using this formula to use and analyze precision colorimeter becomes a feasible behavior. It can be said that this formula is the theoretical basis for the existence of precision colorimeter.

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