The work horse of object detection, proximity sensors are excellent at non-contact detection for a vareity of materials. With a very repeatable but somewhat small sensing range, they are excellent at verifying accurate placement of materials in production environments.

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Types of Proximity Sensors

Inductive Proximity Sensors

Inductive
Inductive proximity sensors excel at reliably detecting metal objects.

Capacitive Proximity Sensors

Capactive
Capactive sensors are an excellent choice for short range (a few inches) and repeatable object detection on non-metallic components like plastics, fluids, wood & paper.