OPB920AZ

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Optical sensors, such as photointerrupters, are essential components used in a wide range of automation applications. In particular, the OPB920AZ slot type transistor-output photo interrupter is a superb high-speed device that offers users reliable and accurate sensing performance for their automation needs. This article will take a close look at the OPB920AZ, giving an overview of its fields of application as well as its working principle.

Application Field

The OPB920AZ is an ideal opto-electronic device for use in automated controls and motion control systems. With its high-speed, reliable and accurate detection capabilities, it can be used to detect magnetic fields generated by permanent magnets which are placed in a particular sensing area. These magnetically activated fields trigger the photo interrupter to sense the passage of objects and switch on its output. This makes the OPB920AZ ideal for sensing the presence of objects, for example in material counting systems, home automation devices, optical scanners, stage lights, flow sensors and other types of automated control systems.

Working Principle

The OPB920AZ uses an active optical sensing mechanism to detect the passage of objects within its sensing area. The photo interrupter consists of an infrared LED light source as well as a complementary detector on either side of a slot-shaped aperture. When an object passes through the sensor, the LED emits an infrared signal which is then detected by the complementary detector on the other side. When the object is no longer present, the signal stops and the output is switched off.

The OPB920AZ also offers users an adjustable sensing area, allowing them to tailor the device’s sensitivity to suit their individual requirements. This is done by controlling the width of the slot-shaped aperture. When the aperture is made smaller, the optical field of view is reduced and the sensor becomes less sensitive to objects passing through it. Conversely, when the aperture is widened, it becomes more sensitive to objects passing through it.

The OPB920AZ also has a built-in hysteresis circuit which helps reduce electrical noise as well as eliminate false signals. This ensures the sensor is only triggered when a certain amount of signal is received, so that only genuine signals are detected. This helps ensure reliable and accurate sensing performance at all times.

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