OPB821

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OPB821 Application Field and Working Principle

Optical sensors provide reliable sensing of objects at distances that far exceed those of other sensing technologies. The use of light to sense an object provides added range and reliable output over a range of environmental conditions. Photointerrupters are one of the most common type of light sensors used in electronic systems, and they are used to detect the presence of an object or to sense the motion, position, or speed of an object. Among all types of photointerrupters, the slot-type photointerrupter, used in the OPB821 model from Optek Technology, is specifically designed for sensing rectangular objects or slots through a pre-determined slotted beam.

The OPB821 features a 3 pin through-hole mount and 0.2 inch (5.08 mm) lead spacing. It has a 0.55 inch (14.0 mm) slot size, 0.8 inch (20.32 mm) detection distance, and a 0.212 inch (5.4 mm) light emitting gap size. Designed for a voltage range of 5 to 24 volts DC, it has a maximum current of 40 mA and minimum switching of 2.5 mA. It also features fast response times of 3 to 4 ms and a maximum off state leakage current of 10 µA.

The working principle behind the OPB821 optical photointerrupter is based on the light source - an infrared emitting diode (IRED) and a phototransistor as the light detector which are housed inside the plastic package. A beam of infrared light is transmitted across a gap between the IRED and phototransistor, and any object passing through the slot is detected either by breaking the light beam or reflecting the light back. When the object passes through the slot, the IRED turns off while the phototransistor turns on and the outputs of the device changes state accordingly.

The OPB821 slot-type photointerrupter is ideal for applications in the industrial, consumer, automotive, and medical industries. It is useful in detecting bottles and boxes in packaging lines, for detecting shaft rotation and part presence in production lines, and for detecting packaging flaws. When used for controlling and monitoring device access, it is useful for different types of door and window switches, and for detecting card readers and ATM machines. It can also be used for positioning applications on numeric control machines.

The OPB821 slot-type photointerrupter offers reliable performance even when there is much dust or dirt in the air. As it is constructed using solid-state technology, it is resistant to many environmental factors such as vibration, shock, humidity, temperature variations and more. As it is designed to be used in a wide range of voltage ranges, it can be used in applications such as those requiring 12/24, 12, or 24 volts power supplies.

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