Classification of SICK photoelectric sensors and their working methods SICK photoelectric sensors have an optical transmitter and a receiver mounted face-to-face on one side of a slot to form a slot-shaped optoelectronic. The light emitter emits infrared light or visible light, and the light receiver can receive light in the unimpeded condition. However, when the detected object passes through the slot, the light is blocked, the photoelectric switch is activated, a switch control signal is output, and the load current is cut off or switched on, thereby completing one control action. The detection distance of the trough switch is generally only a few centimeters due to the limitation of the overall structure.
(2) On-beam photoelectric sensor, if the light emitter and the light receiver are separated, the detection distance can be increased. One light emitter and one light receiver constitute a split-type photoelectric switch, which is abbreviated as an on-beam photoelectric switch. . The detection distance of the shoot-type photoelectric switch can reach several meters or even tens of meters. When using a photoelectric switch, the light emitter and the light receiver are respectively mounted on both sides of the path through which the object passes, and the light path is blocked when the detected object passes through. The light receiver outputs a switch control signal when it passes through.
(3) The reflector-type photoelectric switch inserts the light emitter and the light receiver into the same device. A reflector is installed at the front, and the photoelectric control function is accomplished by using the principle of reflection, which is called a reflector reflection type (or mirror reflection type). Photoelectric switch. Under normal circumstances, the light source emitted by the light reflector is reflected back by the reflector and then received by the light receiver; once the detected object blocks the light path and the light receiver does not receive light, the photoelectric switch activates and outputs a switch control signal.
(4) Diffusion-reflective photoelectric switch The diffuser-reflective photoelectric switch also has a light emitter and a light receiver in its detection head, but there is no reflector in front of the diffuse reflection photoelectric switch. The light emitter emitted by the light emitter is normally not found. In the detection, when the detection object passes the light is blocked, and the light part is reflected back, the light receiver receives the light signal and outputs a switch signal.
What are the causes of no signal output The first thing to consider is the wiring or configuration problem. For the shoot-type photoelectric sensor must be combined by the light emitter and receiver, both ends need to supply power; and the retro-reflective type must be used in combination with the sensor probe and the retro-reflective panel; at the same time, the user must provide a stable power supply to the sensor. For DC power supply, the positive and negative poles must be confirmed. If the positive and negative poles are connected incorrectly, the output signal will not be generated.
The above reason analysis is based on the consideration of the photoelectric sensor. In addition, we also need to consider the problem of detecting the position of the object. If the detected object is not in the detection area, such detection is futile. The detection object must be in a range that the sensor can detect, that is, within the range that the photoelectricity can sense. Secondly, it is necessary to consider whether the optical axis of the sensor is aligned or not. The optical axis of the emitter and receiver sections of the injection type must be aligned. The corresponding retroreflective probe section and the optical axis of the reflector must be aligned. It is also necessary to consider whether the detection object conforms to the criteria of the standard detection object or the minimum detection object. The detection object cannot be smaller than the minimum detection object, so as to avoid the result that the reflection type cannot detect the transparent object, such as reflection type. There is a requirement to detect the color of the object, the darker the color, the closer the detection distance.
Do you understand the classification and working methods of SICK photoelectric sensors?
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