LANBAO's retroreflective photoelectric sensors are highly regarded for their diverse models and broad range of applications. Our product line encompasses polarized filter sensors, transparent object detection sensors, foreground suppression sensors, and area detection sensors. Compared to diffuse reflection sensors, retroreflective sensors offer a larger detection range and trigger detection when an object interrupts the light beam between the sensor and the reflector.
In this issue, we will answer your common questions about retroreflective photoelectric sensors and reflectors. By understanding the working principles and application scenarios of these sensors, we can help you select the right product for your specific application.
A retroreflective photoelectric sensor functions by emitting a light beam that is reflected back to the sensor by a reflector. Any object obstructing this light path causes a change in the received light intensity, triggering the sensor's output.
Retroreflective photoelectric sensors often struggle to detect highly reflective objects. To overcome this challenge, we propose utilizing sensors with polarization filters and corner cube reflectors. By distinguishing between the polarization of light reflected from the reflector and the target, reliable detection of highly reflective surfaces can be achieved.
Retroreflective photoelectric sensors can detect subtle changes in light intensity, making them ideal for detecting transparent objects like glass bottles. As a transparent object passes through the sensor's beam, the sensor detects the change in light and triggers an output signal. Many sensors allow adjustment of the percentage of light change, making them suitable for colored or semi-transparent materials. Lambo designates retroreflective photoelectric sensors designed for transparent object detection with the letter "G," such as the PSE-G series, PSS-G series, and PSM-G series.
By incorporating an optical aperture in front of both the emitter and receiver, foreground suppression limits the sensor's effective detection range. This ensures that only light directly reflected back to the receiver is detected, creating a defined detection zone and preventing reflective or glossy targets from being misinterpreted as the reflector. This feature is particularly useful when detecting objects with packaging films, as it prevents the packaging from causing false triggering.
The choice of retroreflective sensor reflector depends on the specific model of the sensor.
Plastic-housed corner cube retroreflectors are suitable for all sensor types, including those with polarization filters.
For detecting highly reflective objects, it's recommended to use a retroreflective sensor with a polarization filter paired with a corner cube retroreflector. When using a sensor with a laser light source and a short sensing distance, a micro-structured corner cube retroreflector is recommended due to its small spot size.
Every retroreflective sensor's datasheet specifies a reference reflector. All technical parameters, including the maximum operating range, are based on this reflector. Using a smaller reflector will reduce the sensor's operating range.
Post time: Jan-14-2025