OPB875T11

Optical Sensors - Photointerrupters - Slot Type - Transistor Output

The OPB875T11 is a slot-type transistor output photointerrupter manufactured by Optek Technology Inc. A photointerrupter consists of an emitter and a detector that are separated by a chasm called a slot. Where there is no obstruction between the emitter and detector, as in the OPB875T11, infrared light is emitted from the emitter and detected by the detector.

Application Field

A primary application of the OPB875T11 is in the sensing and detection of objects or as part of a larger system. Commonly used to sense the presence or absence of an object, the OPB875T11 can tell if a person or object has moved close to or away from it. With the ability to detect objects accurately without making physical contact, this photointerrupter is perfect for use when you need a reliable presence or absence detection sensor. It is also useful for sensing the presence of an object for use in automated systems and robotics.

Additionally, the OPB875T11 can be used for counting applications. When a rotary dial passes close by, the OPB875T11 can detect it and provide a signal that can be used to register and count the revolutions. This is popularly used in machines such as rev counters, encoders, and counting scales, etc.

Working Principle

When the emitter and detector of the OPB875T11 are connected together, the emitter emits infrared light which is then detected by the detector. As long as nothing is blocking the space between the emitter and detector, the infrared light will be uninterrupted and the transistor output on the OPB875T11 will remain “OFF.” When the gap is blocked, the transistor output will switch “ON” and the logic-level output available will change its state.

The OPB875T11 has a 980nm spectral bandwidth which allows it to detect objects accurately in a wide range of operating temperatures. Its high immunity to ambient light makes it very efficient even in brightly lit environments. It has a stable current transfer ratio of 400% allowing it to construct repeatable events. Furthermore, the OPB875T11 requires a supply voltage between 3 and 24 Volts, and its response time is between 0.5 and 2.0milliseconds.

Conclusion

The OPB875T11 from Optek Technology Inc. is a slot-type transistor output photointerrupter which can be used for a variety of sensing and detection applications. Its wide spectral bandwidth and high immunity to ambient light make it a highly reliable and efficient device. This photointerrupter is well suited for applications in presence or absence detection, counting, and object sensing.