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Detecting Reflective Packages on a Conveyor

A food processor requires the presence verification of granola bars wrapped in reflective Mylar on a conveyor belt prior to final packaging/boxing.

Reflective packages are typically difficult for traditional photoelectric sensors to detect. The reflective nature of the packaging inherently interferes with the sensor.

A QS18 in Foreground Suppression mode is mounted above the conveyor surface (30-200 mm sensing range). Using the conveyor as a "background," the sensor is able to detect objects passing by that may otherwise elude detection due to the reflective nature of the packaging.

In addition, ambient noise created by fluorescent lighting or other sensors in close proximity to the QS18AF is less of a factor with improved "crosstalk" immunity.