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How to detect a small object at 800mm with fibers

Article No: KA-09173
Version: 1.0
Subject to change without notice
This article shows how to detect a small object at a distance of 800mm with throughbeam fibers.
Related Products
LL3-TX01 LIGHT GUIDE
WLL80P-22T6Y1DZA71Z1Z1

Table of Contents

For the test we used the IO-Link Standalone fiber amplifier 6076723 WLL80P-22T6Y1DZA71Z1Z1 with the through beam fiber LL3-TX01. 
The sensor heads were mounted on a linear rail at the same height. 
We need to make sure that the alignment is precise (same height and axis of the TX01 heads). A metal rod was guided well in the center. See below picture:
With a white paper, you´re able to see the blanking (shadow) that the rod is generating. For a reliable detection of the object, we need to make sure that the shading is covering the receiver head. In the picture below, you see the shading when the rod is close to the sender.


 You can control the shading of the receiver also with the white paper (receiver is placed behind the paper. The shadow lost it´s sharpness because of the distance to the sender). See below:
This method helps for a proper alignment. 

Also important: There should be no metal or other shiny/glossy objects in the background. They can lead to a optical short circuit. Usually this happens when the object is in the center of the sensor heads. Please note that this effect  usually only occurs when the light spot
get "in touch" with the background. 
 
 
The setup of the amplifier depends on the individual application circumstances. In this case, the sender power was set to the highest level, response time was 8 ms. 
Keywords:
fibers, small object, throughbeam , LL3-TX01, WLL80, fiber amplifier
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