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Twin-beam sensor detects challenging objects

25 September 2012

Difficult shapes, flat or transparent objects that have previously defied reliable detection can now be more clearly seen with the MultiLine photoelectric sensor from Sick UK.

The MultiLine is said to ensure a stable and continuous detection signal from the leading to the trailing edge of a product, even when surfaces are glossy, flat, or contoured.

The sensor uses twin light-beam technology to ensure consistent detection of difficult objects which are often not detected by single beam sensors. Glossy or dark surfaces, low profiles without obvious starts or finishes, textures, uneven and contoured outlines, can all be detected by reliably eliminating false signals.

The design of the sensor can reduce the risk of machine downtime by eliminating false signals, leading to improved productivity. “By using two parallel light lines arranged vertically, to continuously detect objects, the SICK MultiLine avoids the fluctuations and loss of signal caused by reflective or transparent objects when only one spot is available.” said Phil Dyas industrial sensor product specialist for SICK (UK).

The detection phase starts when both lines detect the object and detection stops when both no longer signal the object, from leading edge to leaving edge. No complex software is required to reduce and suppress false signals.

Greater object throughput is also possible, as objects can be placed on the belt with smaller gaps between them, improving productivity. Additionally, changeover between lines is speeded with less downtime, as the sensor repositioning is usually not required to achieve detection when changing to products with different profiles.

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