Classification Of Photoelectric Sensors

The photoelectric sensor is a sensor that uses a photoelectric element as a detection element. First, the measured changes are converted into changes in optical signals, and then the optical signals are further converted into electrical signals by means of photoelectric elements. So what are the different types of photoelectric sensors, let's take a look together.

1. Reflective plate type photoelectric switch

The light emitter and the light receiver are installed in the same device, and a reflective plate is installed in front of it. The photoelectric switch called the reflective plate reflection type (or mirror reflection type) is used to complete the photoelectric control function by the reflection principle. Under normal circumstances, the light emitted by the light emitter is reflected back by the reflector and received by the light receiver; once the light path is blocked by the detection object and the light is not received by the light receiver, the photoelectric switch acts and outputs a switch control signal.

2. Diffuse reflection type photoelectric switch

Its detection head is also equipped with a light emitter and a light receiver, but there is no reflector in front. Under normal circumstances, the light receiver emitted by the light emitter cannot be found. When the detection object passes through, it blocks the light and reflects the light part back. The receiver receives the light signal and outputs a switching signal.

3. Groove photoelectric sensor

It is a slot-shaped photoelectric that installs a light emitter and a receiver face to face on both sides of a slot. The light emitter can emit infrared light or visible light, and the light receiver can receive light under the condition of no resistance. However, when the detected object passes through the slot, the light is blocked and the photoelectric switch operates. Output a switch control signal to cut off or switch on the load current, thus completing a control action.

4. Opposite type photoelectric sensor

The photoelectric switch composed of a light emitter and a light receiver is called a split-beam photoelectric switch, referred to as a split-beam photoelectric switch for short. Its detection distance can reach several meters or even tens of meters. When in use, the light emitter and the light receiver are respectively installed on both sides of the detection object passing path. When the detection object passes, the light path is blocked, and the light receiver acts to output a switch control signal.