Photoelectric Sensor

- Jul 16, 2020-

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In general, the photoelectric sensor is composed of three parts, which are divided into: transmitter, receiver and detection circuit.


The transmitter is aimed at the target to emit a light beam. The emitted light beam generally comes from a semiconductor light source, a light emitting diode (LED), a laser diode, and an infrared emitting diode. The beam is emitted uninterrupted, or the pulse width is changed. The receiver consists of photodiode, phototransistor and photocell. In front of the receiver, optical components such as lenses and apertures are installed. Behind it is the detection circuit, which can filter out the valid signal and apply the signal.

In addition, the structural elements of the photoelectric switch include an emitting plate and an optical fiber.


The triangular reflector is a launcher with a solid structure. It consists of a very small triangular pyramid reflective material, which can accurately return the light beam from the reflective plate, and has practical significance. It can change the emission angle in the range of 0 to 25 with the optical axis, so that the light beam is almost from one emission line, and after reflection, it returns from this reflection line.