HOA1877-002

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Optical Sensors, and more specifically Photointerrupters, have been an integral part of modern automation for years. There is an ever increasing demand for reliable, low cost, and easy to use Photointerrupters, which can provide reliable and accurate detection of a target object. The HOA1877-002 Optical Sensor is designed to meet this need. This section will explain the application field and working principle of the HOA1877-002 Slot Type Transistor Output Photointerrupter.

The HOA1877-002 is a slot type optical sensor with a transistor output. The sensor uses a highly sensitive slot type optical receiver and permanently energized infrared light emitting diode transmitter. This allows for accurate detection of a target object within a range of 4.5 – 20 mm. The device can be used for the detection of small objects, as well as larger objects up to 20mm in thickness. The HOA1877-002 is also designed to be used in harsh environments, featuring tolerance to vibrations, dust, and temperature changes.

The HOA1877-002 is simple to use and requires minimal external components. The device is connected to a power supply such that a source voltage of 6 - 24V is supplied to the device. The voltage supplied to the device should ensure that the maximum power rating is not exceeded as specified in the datasheet. The output of the device is a currents sink, which can be interpreted as a logic high or low. When an object is detected, the output will switch to a logic low and when the target object is no longer present, the output will switch back to a high.

The working principle of the HOA1877-002 is best explained by illustrating the operation of the device in a schematic way. The Slot Type Transistor Output Photointerrupter, as illustrated in Figure 1, consists of a transmitter (T) and a receiver (R) which are positioned within a slot. The Transmitter is a permanently energized infrared light emitting diode (LED) and the Receiver is a highly sensitive optical transistor. The two components are oriented in such a way that when no object is present the light emitted from the transmitter will be received by the receiver. However, if an object is inserted into the slot, the infrared light will be blocked, which will cut off the signal to the receiver and cause it to switch to a low state. As soon as the object has been removed, the infrared light will re-activate the receiver and it will switch back to a high state.

In summary, the HOA1877-002 Slot Type Transistor Output Photointerrupter is designed to provide reliable and accurate detection of a target object. The device is simple to use and requires minimal external components and can be used in a variety of applications to detect the presence of an object. The working principle of the device is also clearly outlined, making it easy to understand how the device functions.

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