Photoelectric Sensor Fast Guide: 6 Key Issues Analysis

The photoelectric sensor is a sensor for non -contact detection objects. It realizes the detection function by receiving the light value issued by the transmitted end.Optical sensors are also called photoelectric switches.

When choosing an optoelectronics sensor, we need to consider the following questions:

1. Detection distance: The detection distance of photoelectric sensor refers to the distance from the transmitted end to the receiving end.For radio -sensors, the detection distance is equal to the distance between the transmitted end and the receiver; for the return of the reflected reflex and the diffusion reflective type, the detection distance is equal to the distance between the transmitted end to the reflector or the target.
2. Light source type: The main light source types of photoelectric sensors include LED light sources and laser light sources.The LED light source has the advantages of small size, long life, and high efficiency, but the light spots are large, and the beams are prone to divergence. The laser light source light spots are small, and the light beams are not easy to diverge.
3. The gap: The difference means that the measured object never starts the signal output, and slowly moves close to the sensor until there is a signal output position, the position of the point is the position of the movement;Slowly move away from the sensor until the location of the signal output is not the position of the reset point.The difference between the difference between the position and the position of the movement point should be equal to the difference.
4. Optical action mode: The photovoltaic mode of photoelectric sensor includes normally closed mode and frequent opening mode.The normal -closed mode refers to the output signal without an object, and the output signal is stopped when there is an object. The frequent opening mode means that the output signal is stopped when there is no object, and the output signal when there is an object.
5. Switch output mode: The transistors in the photoelectric sensor generally have two output types: NPN and PNP.The NPN output type refers to the current from the setting of the electrode to the transmitting pole, which is often used in the co -positive voltage and output negative voltage; the PNP output type refers to the current from the transmitting polar flow to the collector, which is often used for co -negative voltage and output positive voltage.
6. How to choose the appropriate photoelectric sensor: When selecting the optoelectronics sensor, we need to consider the following factors: First, we need to confirm the material, size, and shape of the measured material in order to choose the appropriate sensor type; second, we need to according to the detection needs according to the detection needs, Detecting the environment, safety space and other factors to choose the appropriate detection type; in the end, we also need to consider the movement speed, environmental temperature, environmental humidity, oil pollution, and dust of the measured material to ensure that the sensor can work normally and work normallyObtain accurate test results.

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