How to Choose the Best Type of Sensor for Clear Object Detection
LED-Based Photoelectric Sensors
Additionally, because light emitted and received travels on a single narrow beam, these sensors can see through a small aperture, allowing them to be shielded for use in washdown and hygienic environments. Photoelectric sensors with polarizing filters will emit and detect light waves of a specific polarization, ignoring all other light waves. This further reduces the risk of false detection caused by reflected light. Learn more about polarized coaxial optics for detecting transparent objects.
Photoelectric sensors have faster response speeds, longer sensing ranges, and higher levels of precision than ultrasonic sensors. LED-based sensors are very effective for general use detecting larger object and largers gaps between objects (compared to laser-based sensors).
Laser-based sensors provide a highly visible laser spot for easy alignment, and a small laser spot ensures greater precision for detection of small objects. A laser-based sensor that does not require a reflector allows for more flexible mounting as well as reduced inventory and maintenance costs.
Ultrasonic sensors are immune to target color, reflectivity, and transparency, which simplifies product changeover and reduces downtime. Additionally, they are unaffected by area light conditions and perform well in dirty and wet environments.
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Clear object detection sensors are sensitive to variations in light and benefit from polarized coaxial optical design to reduce false detection from reflected light.