OPB380N51

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Optical sensors are devices that use light to detect the presence or absence of a target or to measure the intensity of light. Photointerrupters are sensors that detect the interruption of light. They are typically limited range sensors which use transistor output signals. An example of this type of sensor is the OPB380N51, which is a slotted type photointerrupter. This article will explain the application fields and working principle of the OPB380N51.

Application Fields

The OPB380N51 is typically used in applications such as electronic equipment, printed circuit boards, disk drivers, and automated systems. The device is particularly suitable for the detection of rotational speeds and linear speeds, as well as cutting, positioning, and measuring applications. Additionally, the OPB380N51 can be used for safety applications which need to detect the presence or absence of a physical object such as in the detection of a person or object near hazardous machinery.

Working Principle

The OPB380N51 uses a slotted type design and utilizes an infrared LED emitter and an NPN phototransistor as the two detecting components. A slot type aperture is between the emitter and the phototransistor. When the slot is not blocked, light passes through the slot and is picked up by the phototransistor, which then sends a transistor output signal. When some objects or light obstructs the slot, the phototransistor stops sending the output signal. The principle of this process is based on light obstructing or not obstructing the slot aperture.

The OPB380N51 features a quick response time of 25 µs and a range of up to 5 mm. Additionally, the device is small and easy to install. It requires a DC voltage of 6V to 10V for its operation. This versatile device can also be paired with a timer counter to form a pulse generator which can be used for counting applications.

Conclusion

The OPB380N51 slotted type photointerrupter with transistor output is a versatile device used in many applications such as electronic equipment, printed circuit boards, disk drivers, automated systems, and safety applications. The principle of operation relies on the obstruction or not obstruction of the infrared LED emitter and the NPN phototransistor with a slot type aperture. The device is also small and features a response time of 25 µs and a range of 5 mm.

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