Basic principle of photoelectric sensor

Photoelectric sensor emits visible light and infrared light through the transmitter, and then through the receiver to detect the light reflected by the detection object or blocked light changes, so as to obtain the output signal.

Principles and main types

It is illuminated by the light-emitting element of the transmitter and received by the light-receiving element of the receiver.

Diffuse Reflection

The light emitting element and light receiving element are built into a sensor
In the amplifier. Receive the reflected light from the detected object.

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Through Beam

Emitter/Receiver is in separation state. If at launch A detection object is placed between the transmitter/receiver, then the transmitter's
The light will be blocked.

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Retro Reflection

The light emitting element and light receiving element are built into a sensor .In the amplifier. Receive the reflected light from the detected object.The light from the light-emitting element is reflected through the reflector, and Receive through an optical receiving element.If you enter the detection object, it will be blocked

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Characteristic
Non-contact detection
Detection can be done without contact, so it will not scratch the detection object, nor damage.The sensor itself extends its service life and eliminates the need for maintenance.
Can detect a variety of objects
It can detect a variety of objects by the amount of surface reflection or shading
(Glass, metal, plastic, wood, liquid, etc.)
Detection distance length
High power photoelectric sensor for long distance detection.

TYPE

漫反射

Diffuse Reflection

The light is shone on the detected object, and the reflected light from the detected object is received for detection.
• Install only the sensor body, which does not take up space.
• No optical axis adjustment.
• Transparent bodies can also be detected if the reflectivity is high.
• Color discernment

对射

Through Beam

The object is detected by detecting the optical axis between the opposing transmitter and receiver.
• Long detection distance.
• High accuracy of detection position.
• Even if it is opaque, it can be directly detected regardless of shape, color or material.
• Resist lens dirt and dust.

回归反射型

Retro Reflection

The object is detected by detecting the light returned by the reflector after the sensor is emitted.
• As a single side reflector, it can be installed in small Spaces.
• Simple wiring, compared with reflective type, long distance detection.
• Optical axis adjustment is very easy.
• Even if it is opaque, it can be directly detected regardless of shape, color or material.

背景抑制型

Background suppression

The light spot is shone on the detected object and through the Angle difference of light reflected from the detected object Test.
• Less susceptible to background material with high reflectivity.
• Stability detection can be performed even if the color of the detected object and the reflectivity of the material are different.
• High precision detection of small objects.

激光

Laser Through Beam and Diffuse reflection

Light spot irradiation is carried out on the detected object, and the reflected light from the detected object is received for detection.
• Can detect small targets.
• Detectable markers.
• Can be detected from the gap of machinery, etc.
• The detection point is visible

光泽度

Reflective type for glossiness discrimination

The light spot is shone on the detected object, and the light is detected by the difference between specular reflection and diffuse reflection the difference in intensity.
• Available online.
• Not susceptible to color.
• Transptarent bodies can also be detected.

 Recommended Series

PST series     PSV series      PSE series      PSS series      PSM series

 


Post time: Jan-31-2023