Three types of Omron Photoelectric Sensors

As the world becomes more advanced technologies, the knowledge of these new advanced technologies are important in order to help with your daily or working life. These new devices can either make your life or company easier. Sensors are one of the devices that are important for manufacturing companies. Sensors come in many types and functions. One of them is Omron photoelectric sensors. Photoelectric sensor is a device that receives light and analyses the disparity of the light level of the light source. An output, signal converter, amplifier, and light source are well equipped in the sensor.

Three Types of Photoelectric Sensors

1. Thru-Beam

Thru-beam sensing is the action of using two different devices to either break or make a beam. Another name for this is the opposed mode. Thru-beam sensing works by having one senso to become the light emitter while the other one becomes the receiver. Therefore, when an object disturbs the light beam, the thru-beam sensor will be able to notice the object. 

There are various uses for thru-beam sensors such as detecting tiny objects, detecting the levels of filled liquids inside of the containers, detecting the accurate location of an object and many more.

Some benefits of using a thru-beam sensor is that it has the widest range of sensing an object and also is the most accurate type of photoelectric sensor, compared to the other two. They are also good to be used in unclean surroundings. However, as explained earlier, thru-beam sensors need two separate devices to be installed when using.

2. Retroreflective

Different from thru-beam sensing, both the source of light and receiver are from the same machine in retroreflective sensing. A reflector is needed as retroreflective sensing requires one to work together. The reflector will reflect the light emitted by the sensor back. If an object interrupts the reflected light, the sensor will be able to identify the object’s presence. 

There is also another version of retroreflective sensing called polarized retroreflective sensing. A polarized optical block is needed for this sensing as it aims to decrease certain weakness that appears from shiny surfaces of objects. 

Uses of retroreflective sensors are varied such as detecting big objects, detecting any shiny products that are made out of glass or plastics, and many more. 

This sensor, compared to thru-beam sensors, are far more cheaper. Unfortunately, it’s accuracy is a little bit less than thru-beam sensors. However, retroreflective sensors are better when dealt with any products that are transparent and clear. 

3. Diffused 

The diffuse, or optical proximity sensing, is the same as retroreflective sensing where the receiver and light source are from the same device.  When the target reflects the light beam back towards the receiver, diffused sensors will be able to detect that object. Diffused sensors are very compact, hence they are a better option for automation related.

Examples of how diffused sensors can be used are like detecting many objects all together, having the ability to detect specific characteristics of objects, detecting any risk of the object and many more.

Just like retroreflective sensors, diffused sensors are affordable. It is also the simplest to install, compared to the other two. However, there are some disadvantages of these sensors such as they are not that accurate when used to detect position and are affected by certain outside factors (colours, angles, environments and textures).