Cut Sheet

V8-T5-36 Volume 8—Sensing Solutions CA08100010E—July 2015 www.eaton.com
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5.3
Photoelectric Sensors
IntelliView Series Sensors
Overview—Color and Contrast Sensing Models
Color Sensors
●
Can be programmed to
recognize three different
colors independently
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Capable of sensing targets
5–45 mm away from the
sensor face
●
Rectangular plastic
package features a four-
digit display, two
programming buttons and
output status LEDs
●
Optional serial connection
(RS485) allows for remote
communications
●
Standard M12 8-pin micro-
connector (mating cable
available on Page
V8-T5-28)
Contrast Sensors
●
Ideal for detecting different
colored or grayscale
contrasts, such as
registration marks
●
Capable of sensing targets
out to 10 mm from the
sensor face
●
Simple three-step setup
routine for quick
installation or optional “fine
setup routine” for more
complicated applications
●
Complementary outputs
can function in either light
operate or dark operate
modes
●
Standard M12 4-pin micro-
connector (mating cable
available on Page
V8-T5-29)
Color Sensing Basics
Color sensors work by using a “chromaticity” detection algorithm. Chromaticity is determined by
two characteristics: hue and saturation. Hue is determined by the reflected light’s wavelength,
while saturation indicates the pureness percentage (with white representing 0%). Eaton’s color
sensor goes one step further and provides an optional “chromaticity plus intensity” algorithm. This
mode provides a higher sensitivity to tone variations and is recommended for detection of different
colors on the same type of material. It will also better distinguish between gray tones.
The color of a target is determined by the color components of the reflected source light. The
target color is identified by analyzing the red (R), green (G) and blue (B) channels of reflected light.
For example, yellow can be identified by the following reflections: R=50%, G=50%, B=0%; orange
can be identified by R=75%, G=25%, B=0%; pink by R=50%, G=0%, B=0%. The RGB
combinations are practically limitless. Applications for color sensors are common in many
industries, ranging from quality and process control, to automatic material handling for
identification, to orientation and selection of objects according to their color.
Contrast Sensing Basics
Contrast sensors (also defined as color mark readers, according to their most popular application)
go beyond simple presence/absence detection to distinguish two surfaces according to the
contrast produced by their difference in reflectivity. For example, a dark reference mark (low
reflectivity) can be detected by comparing it against the contrast of the lighter surface (high
reflectivity). A white LED light source is used for general purpose contrast sensing, enabling
detection of the very slightest of contrast variations—even those that share the same general
material and color. Contrast sensors are frequently used in automated packaging applications for
registration mark detection to automate the folding, cutting and sorting phases.