OPB940W55Z

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Optical sensors are devices that detect the presence or absence of light which allows for the measurement of displacement and position as well as speed and distance. Photointerrupters are an example of an optical sensor, and in particular, the Slot Type Logic Output is a popular type. The OPB940W55Z is an example of one of these devices and this article will discuss its application fields and working principles.

Application Field

The OPB940W55Z is a slot type logic output photointerrupter. It is designed to be used for pulse signals applications where movement or displacement measurement is required. These devices consist of an infrared LED and an NPN silicon photo transistor whose characteristics, such as the photo current, vary according to the amount of incident light that hits the sensor. In particular, the OPB940W55Z is designed to sense a slot of varying width, and output a logic level at the detector output depending on this width.

The OPB940W55Z is suitable for applications where a long life and reliable operation is essential, such as in motor control systems or semiconductor processing equipment. It can also be used in filing systems, medical imaging systems, and any other applications where a compact and precise slot sensing solution is needed.

Working Principle

The OPB940W55Z is a NPN siliconDarlington output type photointerrupter. It consists of an infrared LED and NPN silicon photo transistor. The output is a logic level, which switches between LOW (typically 0.3 volts) and HIGH (typically 0.8 - 3.3 volts) depending on the width of the sensed slot. It must be powered with a voltage between 2.8 and 18 volts DC.

The device works by emitting infrared light from the LED at the centre of the slot. The light is reflected off the walls of the slot and sensed by the photo transistor. Depending on the width of the slot, different amounts of light will be transmitted and different amounts of photo current will be generated. This photo current is then used to switch the output between LOW and HIGH. When the slot is wider, the output will be HIGH, and when it is narrow, it will be LOW.

The OPB940W55Z has a built-in LED driver circuit that enables stable operation and a long life. The device alsofeatures an opentransistor output that can be interfaced directly with 5 V TTL logic circuits. It is designed to sense a slot from 0.2mm to 8mm wide.

Conclusion

The OPB940W55Z is an example of a slot type logic output photointerrupter. These devices are designed to output a logic level depending on the widths of the sensed slots, and are suitable for applications where long life and reliable operation is essential. The OPB940W55Z works by emitting infrared light from the LED at the centre of the slot, and using the reflected light sensed by the photo transistor to switch the output between LOWand HIGH.

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