OPB812L55

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OPB812L55 is an optical sensor from the slot type photointerrupters family with a transistor output. This sensor includes an infrared emitter and a phototransistor that are positioned opposite one another, forming a 90° light gap. By reflecting a beam of light from one element to another, the OPB812L55 can detect the disruption or continuity of the light beam. When the light is interrupted, the transistor output status changes.

Applications

The OPB812L55 optical sensor is mainly used in motor control, feedback systems, counting and positioning systems, automotive and industrial applications. This sensor is suited for integration in motion detector systems or robot position and limiter control systems. Additionally it can be used to detect fail-safe overload conditions in automatic production lines and autoloaders, as well as objects that may interrupt the light path in scalable manufacturing industry.

Working Principle

The OPB812L55 is composed of two main components: an infrared LED light source and a phototransistor. When the light beam is left uninterrupted, the phototransistor remains non-conductive, thus maintaining the output voltage state in the ‘OFF’ position. On the other hand, whenever the light gap is blocked by an object, the phototransistor switches to the ‘ON’ position, thus changing the output voltage state.

The OPB812L55 employs an optical source that emits focused light towards the phototransistor, creating a light gap between the two. This gap is large enough to allow small objects to cross it without contacting one of the components. The optical gap is spanned by an internal cone lens that helps to ensure a consistent input level across the full sensing range, even when the object is close to the phototransistor.

To further protect the sensor from potential malfunctions, the OPB812L55 incorporates several features. This includes a LED quenching system that maintains a consistent LED forward voltage and a light pipe that rejects unwanted UV light. Furthermore, the OPB812L55 is designed to resist noise interference from outside sources, such as electromotive forces or mechanical vibrations.

Conclusion

The OPB812L55 optical sensor is an ideal solution for automated control systems. It offers a reliable and easy to implement mechanism to detect when an object disrupts the light gap between the sensor\'s emitter and phototransistor. Furthermore, its protective features ensure a safe and consistent operation.

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