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Optical Sensors - Phototransistors

OP755C is a type of optical sensor belonging to the category of phototransistors. It is applied to many fields due to its advantages such as fast response speed, high sensitivity and wide temperature range. In this article, we will discuss the application fields and working principles of OP755C.

Application Fields of OP755C

OP755C is widely used in many fields, such as consumer electronics, industrial automation, medical equipment, automotive electronics and etc. InConsumer electronics, it is used as a switch in optoelectronic keyboards, remote control and toy guns, where it can control the response speed of other circuits or detect the optical signals. In industrial automation, it is usually supposed to detect the presence or absence of objects, or detect the degree and size of objects. In automotive electronics, it can be used in the detection of warning indicators or warning lights, and even speed or spark detection, which can make the entire control system works safer and more efficient.

Working Principle of OP755C

OP755C phototransistor is a type of photosensitive device based on the photoelectric effect. Its working principle is that when infrared light is shined onto the cathode, the voltage of the device will increase, then electrons will be emitted, forming a current under the action of an external electric field. The current signal of the device can be used to control the output of the device.

In terms of structure, OP755C is composed of an emitter, a base and a collector, like other transistors. The collector is semiconductive silicon, of which the top part is illuminated by infrared light. When light illuminates the top of the collector, electrons and holes will be generated, thus making the device conducting. The resistor is connected between the base and the emitter, which can limit the current in the circuit and make the device achieve saturation or open.

In conclusion, OP755C optical sensor, belonging to the category of phototransistors, has advantages of fast response speed, high sensitivity and wide temperature range, and it has been widely used in various fields, such as consumer electronics, industrial automation and automotive electronics, and its working principle is based on the photoelectric effect.

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