Measuring Principle - MICRO-EPSILON colorSENSOR CFO Series Operating Instructions Manual

Functional Principle, Technical Data
2.2
The measuring system for relative color measurement/inspection consists of an evaluation unit – the CFO
controller – and a CFS sensor. The sensor is connected to the controller via an optical fiber.
Interfaces
Fig. 1 Measuring principle
The specimen is illuminated with homogeneous, white light from an LED. A CFS sensor is used to project a
point of illumination onto the surface to be inspected. The light is reflected diffusely at a specified angle and
transmitted by the same sensor to a perceptive True Color receiver (XYZ) where it is analyzed.
The three wavelength ranges, i.e.
- X = long wave,
- Y = medium wave and
- Z = short wave light portions
from the specimen are used to determine the diffuse color reflections and thereby transformed into a selected
color space. These color values are calculated according to the procedure described in DIN 5033.
The transformed values (colors), are stored in the controller and continuously compared to the current color.
When the colors are all within the entered tolerance range, a recognition signal is sent to the digital switching
outputs and the keypad indicators. This process allows storage of multiple colors in various color spaces.
In the same manner, the color values and the recognized color are output as data protocol via the available
interfaces as required.
colorSENSOR CFO

Measuring Principle

Optical fiber
Sensor
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