MINIATURE PHOTOELECTRIC SWITCHES (industrial sensor)
 | Photoelectric Proximity Switches With Foreground Suppression (FGS)
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 | Photoelectric Proximity Switches With Background Suppression (BGS)
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 | Through-Beam Photoelectric Switches
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 | Photoelectric Proximity Switches
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 | Photoelectric Reflex Switches
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The first thing that you’ve got is a through beam sensor, and a through beam sensor is basically an emitter and a receiver and they basically just look right at each other, and so if you break the beam there’s an output, or there may be an output whenever the beam sees each other. So that’s one way to look at it.
There’s also what’s called retroflective and that’ll be where you use a reflector and a sensor, and the sensor basically sees its light source bounce off the reflector and come back to the receiver that’s in the same housing.
The third type is diffuse reflective which requires no sensor so the lights just going to bounce off the object and come back into the receiver itself.
The differences between the three typically are gonna affect your sensing distance and also it can really hinge on the reflectivity of the object that your trying to sense. So really you just need to take a look at your application, the mounting location of the sensor, how far away you can be or how close you can be to the object your trying to sense, can really help determine which one of those 3 are going to be the best for you.
Also what you’ll find is there’s different light sources inside of the sensor and that can affect the sensing distance, it can also affect the stability of the signal, and also in certain environments where there can also be contaminants in the air or light pollution, external light pollution that affects the receiver, you might need a different light source to mitigate some of those. Your typical light sources that you’re going to find in todays market are gonna be led lights, infrared lights, laser lights, and every now and then you’ll run into an application that calls for an ultraviolet light inside of a sensor. And again that’s just gonna affect the sensing distance, the stability, things of that nature.
And so like I said it’s not rocket science, just make sure that you test. I can’t stress enough how many times people think that they know that a sensor will work at an application, they never tested it, and then we get a call saying they need to return the model for a different one because for some reason it didn’t work for one reason or another that would have been easy to test. The actually, even Omron manufactures a checker. So this is basically a DC power supply that you can wire a sensor into and there a little light output that tells you when the output of a sensor turns on and you can even turn on a little buzzer so it’s really handy to be able to hook up a sensor, go out on your line and just start testing stuff and see when you get your output and make sure its stable.
So again if you have any questions, you need help with this, there’s always new sensors coming out, all kinds of new technology that makes them more powerful, gives them extended range, and that’s something Innovative IDM can really help you with because it’s our job to know that kind of stuff and be able to help you with any applications that come up. We also have sensor specialist we can bring in if necessary, you can also find a lot of this information on our website which is innovativeidm.com go to our knowledge center, you can find white papers for our different types of sensor applications and best practices.
Credit to Jeff Rogers, Innovative IDM
LED Display System Design &
manufacturer
CUSTRONICS
Engineered & Assembly in Malaysia
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https://www.custronics.com
Jim Loo
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