OPB847L51

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Optical sensors are components that allow for the detection and conversion of light energy to electrical energy, enabling electronic devices to use the light in various scenarios. The OPB847L51, a slot type photointerrupter with a transistor output, is one such example of an optical sensing device. This article will review the application field of the device and the working principles behind it.

Application Field

The OPB847L51 is a general purpose, slot type photointerrupter fit for various applications in robotics, industrial production, communication, motor control, etc. Its main feature is that it can efficiently sense signals from objects that pass through a slot starting from a minimum width of 1mm. This makes it suitable for precise detection of the presence or absence of small objects such as metal particles, coins, and barcodes. Furthermore, it has both high speed and high sensitivity, allowing it to accurately detect the presence of a number of objects quickly and efficiently.

Working Principle

The underlying principle behind the OPB847L51\'s detection is based on an optical transduction process. It consists of an infrared light-emitting diode (LED) and an integrated phototransistor. The LED emits light rays in the slot, which is then detected by the phototransistor when an object passes between the two. The reflected light signal generates a voltage drop in the phototransistor, causing the transistor\'s resistance to decrease. The change in resistance leads to an increase in the current flowing into the collector of the phototransistor, which in turn triggers an output signal.

The controlled current flowing through the phototransistor changes four basic parameters: the intensity of light that passes through, the speed at which the object travels across the slot, the light-receiving angle, and the light-sensing distance. In particular, it is important that the light emitting diode and the phototransistor are arranged in an appropriate way to maximize the sensing capabilities. This ensures that the device is able to accurately detect a wide variety of objects.

Conclusion

The OPB847L51 is a slot type photointerrupter with a transistor output that is designed for use in various applications. It is based on an optical transduction process that provides efficient detection of small objects, and is able to do so with both high speed and high sensitivity. The arrangement of its components is essential for optimal performance, and it utilizes four basic parameters for precise detection. With its versatility and performance, it is an excellent choice of sensor for a variety of applications.

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