OPB891L51

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OPB891L51 Application Field and Working Principle

Photointerrupters are devices used to detect objects passing through a beam of light, and the OPB891L51 (or Optek part number OPB891L51) is a type of slot type photointerrupter with a transistor output. It is discussed in this article because of its wide range of applications and its useful working principles.

Applications

The OPB891L51 is used in a variety of different applications that rely on the detection of objects passing through a beam of light. Its extremely fast response time makes it ideal for applications that involve the tracking of objects moving at high speeds, such as in Robotics or Automation. It is also useful for applications in which a low power consumption is required, which include motion sensing applications and timer control systems. Finally, it is also used in security and anti-theft systems, as well as counters or other system-wide monitoring applications.

Working Principle

The OPB891L51 utilizes a slot type design, which utilizes a infrared LED and a light detector as its primary components. The infrared LED emits light into the slot, and when an object enters the slot, the light is disrupted, which is detected by the light detector. This detected change in the light level is then transferred to a transistor output. Depending on the configuration, the transistor can either be operated in either an NPN or PNP style.

For most applications, the OPB891L51 is connected to a rectifier in order to get a more precise indication of when the light has been disrupted. This has the added benefit of providing a faster response time, as not only does the light detector have to sense the light, but also has to detect if the current has been disrupted and trigger the response accordingly.

Additionally, the OPB891L51 is also designed to have a built in noise immunity feature, which works to filter out any noise or interference that may be present in the environment. This makes it ideal for installations into environments with a lot of electromagnetic interference, such as factories or industrial sites.

Conclusion

The OPB891L51 is an ideal choice for applications in which fast response time and reliability is essential. It is a type of slot type photointerrupter with a transistor output, which can be used in a variety of different applications, ranging from motion sensing to anti-theft systems. It utilizes a rectifier and a built in noise immunity feature in order for it to operate as effectively as possible, and is typically used in environments with a lot of electromagnetic interference or objects that move at high speeds.

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