OPB865T55

Optical Sensors are devices that can detect and convert light radiation into electric signals, allowing machines to understand and process optical signals. The Photointerrupter, which is one of the main classes of Optical Sensors, is a device that uses an LED to project a beam of light which is interrupted when an object passes through the slot, causing a change in the output voltage of the device.

The OPB865T55 is an example of a Photointerrupter from the Slot Type category which has a Transistor Output. Specifically, the OPB865T55 is a reflective slot optically coupled through a gallium arsenide IRLED and a photosensor, which is mounted internally in an epoxy-filled, molded plastic housing. This slot optocoupler provides a compact solution for switching and sensing objects, such as a disc, tape, or belt, in motion detection applications.

The main application fields of the OPB865T55 are geared towards motion detection, due to the ability of sensing objects which are in rotational motion. The device measures the speed of the object passing through its slot and produces an output signal in the form of a switch closure, which is then used for displaying information or actuating in response to the application.

The OPB865T55 has a Transistor Output, which works in a different way from its complementary Phototransistor Output version. It utilizes an open-collector transistor output which is used to sink current and allow voltage or current output signals to be produced via a transistor switch. This makes the device ideal for direct interfacing with other electronic devices, such as encoders or TTL/CMOS logic circuits, as it eliminates the need for extra circuitry.

The working principle of the OPB865T55 is based on the principle of optical interruptions. When an object passes through the device’s slot, it interrupts the light beam, which causes a change in the output voltage. When the object is no longer present, the output voltage will return to its nominally off state. The output voltage will switch between its normally on and off states as the object passes through the slot, making it ideal for use in motion detection applications.

The OPB865T55 has a wide range of features, including low power consumption, high isolation voltage, and excellent response time. With its ability to directly interface with other electronic devices and compact form factor, the OPB865T55 is a highly efficient device for measuring the speed of an object in motion.