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Optical Label Sensor - LionEye2

Single-Ended Capacitive Label Sensor

Strength

Inexpensive

Weakness

Clear Labels, Speed

Scores

Performance: 3/5
Materials: 2/5
Ease of Use: 4/5
Cost: 5/5
Reliability: 5/5

Resources

Label Sensor User Manuals

Adjusting Label Sensors

Complete Technical Details on the LionEye2

Description

Ultrasonic label sensor field

Optical sensors use a beam of light, often infrared, which can penetrate the liner but is blocked by the label material.

Optical sensors work by placing a light source (usually infrared) under the web and a detector above the web that measures the brightness of light coming through. Changes in the opacity of the label compared to the liner between labels is used to detect the label edge.

The obvious problem with optical sensors is that they cannot detect transparent or clear labels, regardless of what the liner material is. Clear labels do not block any light, so the edge is not detectable by optical sensors.

Sometimes "eyemarks" are added to the liner - black bars between the labels. The cost of eyemarks is much greater than the cost of a sensor capable of sensing clear labels.

Optical sensors are perfectly accurate at low speeds. At higher speeds, their accuracy degrades a small amount.

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