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Application Note: Understanding the WLT280L Retro Reflex Sensor
We understand that there have been inquiries and concerns regarding the behavior of the WLT280L sensor, particularly in comparison to other retro reflex sensors such as GL6, WL4S, or WL12. We would like to provide clarification on the functionality of the WLT280L to address any confusion.
Background:
Retro reflex sensors typically operate by switching when an object interrupts the light beam projected by the sensor, resulting in a change in the received light. This is a common behavior exhibited by sensors like GL6, WL4S, or WL12.
WLT280L Distinctiveness:
The WLT280L, on the other hand, operates in a different manner. It is recognized as a Time-of-Flight (TOF) sensor, similar to the WTT280L, with the ability to detect objects up to 3-4 meters away. However, the uniqueness of the WLT280L lies in its capability to not just identify the presence of an object but to determine the distance of a reflector within the light beam.
Understanding the Operation:
Unlike traditional retro reflex sensors that switch upon beam interruption, the WLT280L remains active as long as it receives a signal back. It doesn't distinguish between a hand, a paper, or a reflector but rather focuses on the distance to the reflector. This is a crucial distinction - the sensor does not switch off when the light beam is interrupted; instead, it stays active as long as it continues to receive a signal.
Signal Adjustment:
During manufacturing, the WLT280L is precisely adjusted to the signal level of a reflector at a specific distance. Reflectors possess a significantly higher reflective characteristic than materials like white paper. As a result, the sensor is capable of detecting a wide range of objects within a short distance (< 2m), while still reliably detecting the reflector up to an impressive 18 meter.
Graphical Representation:
The graphical representation of the sensor's behavior differs from traditional retro reflex sensors. The manual includes a graph that reflects the sensor's ability to detect objects based on distance rather than beam interruption.
Conclusion:
In summary, the WLT280L is designed to provide distance information to a reflector rather than relying on beam interruption. This unique functionality makes it well-suited for applications where the precise distance to a reflector needs to be determined. When analyzing applications on the customer side, it's crucial to consider this distinctive feature to ensure accurate interpretation of the sensor's behavior.
We hope this application note clarifies any concerns and enhances your understanding of the WLT280L sensor. If you have further questions or require additional assistance, please feel free to contact our technical support team.
