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Optical Sensors - Phototransistors

Optical sensors are used for a wide range of applications, including industrial, automotive, medical and home automation. Among these, phototransistors are especially popular because they offer a relatively low cost, high sensitivity and a wide dynamic range. The OP508FB is one such phototransistor, and is particularly suited for applications where a response time is needed. In this article, we will discuss its application field and working principle.

Application Field

The OP508FB is designed for speed sensing, position detection, proximity sensing and optical switching applications. It is a popular choice for industrial applications since it can be used to detect just about any movement, be it in a switch or in a rotating shaft. Its low power consumption also makes it suitable for battery operated systems.

The phototransistor is also commonly used as an analog light sensor. It can be used to measure a variety of light levels, from UV radiation to infrared. Additionally, the phototransistor is commonly used in medical applications. It can detect X-ray exposure and is often used for radiation detection. It is also used for spectrometry, a technique used to measure light absorption and emission levels.

Working Principle

The OP508FB is a bipolar-type silicon phototransistor. It consists of a base, an emitter and a collector. The device is sensitive to light because of a thin layer of polysilicon on the base. When light passes through the polysilicon, it creates electron-hole pairs in the layer, generating a current in the device.

The light creates a small voltage between the base and the collector. When the voltage gets too high, a large amount of current passes through the device, creating a signal that can be used to detect light. The current can be manipulated by adjusting the base-collector voltage. This allows the device to sense a wide range of light intensities.

The OP508FB offers a wide range of response times, from fast-switching to slower speed-sensing. The response time of the device depends on the strength of the light and the amount of current passing through the device. The device can sense the difference in light levels even when the intensity of the light is low or very short. This makes it very suitable for applications where it needs to measure small changes in light level.

Conclusion

The OP508FB is a popular phototransistor for light sensing applications. Its low cost, high sensitivity and wide dynamic range make it suitable for industrial, automotive, medical and home automation applications. It is also notable for its ability to detect small changes in light intensity, making it suitable for applications where a response time is needed. This article has provided an overview of the OP508FB and its application field and working principle.

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