OPB315L Sensors, Transducers

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Optical Sensors Photointerrupters Slot Type Transistor Output devices such as the OPB315L are used in a variety of applications, including motion sensing, object detection, and light intensity measurement. Utilizing a transistor output, these devices measure changes in optical signal level when a reflective or opaque object passes through the light path. The universal availability and ease of use of these devices make them an ideal choice for many different sensing applications.

The working principle of a transistor output type optical sensor like the OPB315L is relatively simple. In a typical configuration, an infrared light emitting diode (LED) and a photosensitive transistor optically configured as an open-collector are placed opposite each other within a housing. When an opaque or reflective object passes within the path of the light between the LED and the transistor, the resulting change in the output level of the photosensitive transistor triggers a switching action. The resulting output state is inversely proportional to the state of the light path interrupting object - when an object is present, the output of the transistor will go low, and when an object is removed, the transistor will return to a "high" output state.

This simple arrangement makes the transistor output type of photointerrupter ideal for a variety of applications, including motion sensing, object detection, and light intensity measurement. In motion sensing applications, the device acts as an indicator that an object has successfully passed through a light path. By properly positioning the photointerrupter in the vicinity of moving objects, the opposite state of the transistor output can thus be used to determine when an object has moved past a given location. The transistor output type of photointerrupter can also be effectively used to detect the presence or absence of objects in predetermined locations, and to measure changes in ambient light intensity.

The OPB315L integrated circuit incorporates a high-efficiency infrared LED and photosensitive transistor output into a miniature lightproof housing. This device features an active-low output signal, meaning the output state will go low when an object is present in the optical path. In addition, a wide supply voltage range (2.4 - 24VDC) and a low operating current (2.5mA) make this device ideal for most any application.

In conclusion, the OPB315L transistor output type of photointerrupter is an ideal choice for a variety of different applications, due to its wide available supply voltage and low current draw. This device can accurately measure changes in optical signal level when a reflective or opaque object passes through the light path, making it an effective solution for motion sensing, object detection, and light intensity measurement.

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