Photoelectric sensor systems
Photoelectric sensors for every application
The principle of the diffuse reflection sensor is based on the light emitted by the transmitter being reflected by the target object and the receiver evaluating this reflected light. This enables reliable object detection without the need for auxiliary equipment such as a reflector or a separate receiver unit. The transmitter and receiver are contained in the same housing. With this type of sensor system, the registration range depends to a great extent on the reflection properties, shape, colour and material properties of the target object.
With these photoelectric position sensors the transmitter and receiver units are also contained in the same housing, but the beam of light is returned to the receiver by means of a reflector. autosen’s retro-reflective sensors are all equipped with a polarization filter and only work in combination with retro-reflectors (prismatic reflectors). The key advantage in this case is that only the incident light beam (rotated through 90° by the prismatic reflector) can pass through the light plane filter of the receiver. Based on this functional principle, it is even possible to recognise shiny object surfaces, as the reflected light is not mistakenly recognised by the receiver as light from the transmitter.
With through beam sensors, the transmitter and the receiver are contained in two separate housings which are positioned directly in line with each other on opposite sides of the target to set up the light barrier system. The transmitter sends a light signal that impinges the receiver on the opposite side. When an object interrupts the light beam, the receiver voltage drops and the switching function is triggered. This principle allows the user to detect opaque and reflective objects. It provides for broad registration ranges and a high level of excess gain. Through beam sensors are less susceptible to interference and therefore particularly suited for use in difficult conditions.
Laser sensors are used wherever small objects are to be registered or where the position detection has to be especially accurate. Laser light consists of light waves with the same wavelength and a common, fixed phase relationship (coherence). This means that the beam only diverges to a very small extent, which is one of the most important features of laser sensors.
The result: Thanks to the small divergence angle it is possible to achieve large ranges. The laser point that can also be seen clearly, even in daylight, makes system alignment simpler.
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