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What are the principles and main categories of photoelectric sensors?

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What are the principles and main categories of photoelectric sensors?
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  • Categories:home-industry
  • Author:
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  • Time of issue:2023-03-13 17:39
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(Summary description)The photoelectric sensor includes groove photoelectric sensor, through-beam photoelectric sensor, reflector-type photoelectric sensor and diffuse reflective photoelectric switch.

What are the principles and main categories of photoelectric sensors?
Top

(Summary description)The photoelectric sensor includes groove photoelectric sensor, through-beam photoelectric sensor, reflector-type photoelectric sensor and diffuse reflective photoelectric switch.

  • Categories:home-industry
  • Author:
  • Origin:
  • Time of issue:2023-03-13 17:39
  • Views:
Information

A photoelectric sensor is a sensor device that detects light signals and converts them into electrical signals. It can be used to detect light intensity, illuminance, radiation temperature measurement, gas composition analysis, etc. Detect part diameter, surface roughness, strain, displacement, etc. Non-electricity can be indirectly converted into changes in the amount of light. Because photoelectric sensors have many characteristics such as high performance, fast response, and non-contact, they have important applications in the fields of industrial automation devices and robots. Especially in recent years, the emergence of image sensors has opened up a new chapter for the further development of photoelectric sensors.

 

How Photoelectric Sensors Work

The photoelectric sensor is mainly composed of three parts: transmitter, receiver and detection circuit. Among them, the transmitter is used to align the target light beams emitted by semiconductor light sources, light-emitting diodes, laser diodes, infrared-emitting diodes, etc. The receiver can be divided into photodiodes, phototransistors, photocells, etc. There are also optical components such as lenses and apertures in front of the receiver, which are mainly used to receive the target beam and convert the received optical signal into an electrical signal. The detection circuit is used to detect the received electrical signal and filter out the effective signal, which is passed to the next module for practical application of the electrical signal.

 

Classification of photoelectric sensors

(1) Groove photoelectric sensor

It is a slot photoelectric that mounts an optical transmitter and a receiver face-to-face on both sides of a slot. The emitter can emit infrared light or visible light, and the light receiver can receive the light under unobstructed conditions. But when the object to be detected passes through the slot, the light is blocked, and the photoelectric switch acts. Output a switch control signal to cut off or connect the load current to complete the control action. The detection distance of the slot switch is generally only a few centimeters due to the limitation of the overall structure.

 

 

(PMK50T groove photoelectric sensor)

 

(2) Through-beam photoelectric sensor

If the emitter and receiver are separated, the detection distance can be increased. A photoelectric switch consisting of an emitter and a receiver is called a split photoelectric switch, or a 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 passing path of the detection object, and when the detection object passes through to block the light path, the light receiver will act and output a switch control signal.

 

(PM18 series proximity sensor )

 

 

(3) Reflector-type photoelectric switch

Put the light emitter and light receiver into the same device, install a reflector in front of it and use the reflection principle to complete the photoelectric control function, which is called reflector reflective (or mirror reflective) photoelectric switch. Normally, the light emitted by the emitter is reflected by the light panel and received by the receiver. Once the light path is blocked by the detection object and the light receiver cannot receive light, the photoelectric switch will act and output a switch control signal.

 

(PF50R series photoelectric sensor)

 

(4) Diffuse reflective photoelectric switch

It also has an emitter and a receiver in the detection head, but there is no reflector in front. Under normal circumstances, the light receiver emitted by the emitter cannot be found. When the detection object passes through and blocks the light, and part of the light is reflected back, the light receiver receives the light signal and outputs a switch signal.

 

(PF21B series photoelectric sensor)

 

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