OPL801

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The OPL801 is an optically coupled photo detector specifically designed for the long wavelength infrared (LWIR) range of radiation. This photo detector operates on a single supply voltage, and provides a logic-level output when radiation in the LWIR range is detected. It is designed to accurately convert the optical radiation into an easily detected logic-level signal. This article will discuss the application field and working principle of the OPL801.

Application Field of the OPL801

The OPL801 is well-suited for use in a wide range of IR detection applications, such as industrial infrared gas detection, ranging, and surveillance. It is also used in security systems, home automation systems, and vehicle sensor systems. Its small package size and low current requirement make it an ideal choice for applications with limited space and power availability.

Working Principle of the OPL801

The OPL801 is a transmissive type optical sensor, which is sensitive to infrared radiation in the LWIR range. It consists of an infrared sensitive photodiode and an integrated logic circuit. In operation, the photodiode is illuminated by the infrared radiation from the target source, and generates a current proportional to the intensity of the radiation. The generated current is then converted to a logic signal by the integrated logic circuit, which provides a logic-level output indicating the presence or absence of the radiation.

The OPL801 has a built-in threshold voltage level that can be adjusted to provide stable detection operation over a wide range of radiation intensities. This threshold voltage level is set by using an external resistor connected to the Threshold pin, which controls the hysteresis of the photo detector. The adjustable threshold level allows the user to set the desired signal sensitivity for the application.

The OPL801 also provides low power operation, and can be operated from a single supply voltage, making it well-suited for applications with limited space and power availability. The OPL801 is an all-in-one device, eliminating the need for external components, and allowing for a simple and cost-effective solution for infrared detection.

In conclusion, the OPL801 is a versatile and cost-effective optically coupled photo detector, specifically designed for the long wavelength IR range. It offers a logic-level output that indicates the presence or absence of infrared radiation, and the adjustable threshold level allows the user to set the desired threshold sensitivity for their application. Its small package size and low power requirement make it an ideal choice for space and power-limited applications.

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