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Pepperl+Fuchs Blog

What Is a Multi-Ray Photoelectric Sensor?

Posted by Michael Turner on Thu, May 01, 2014

Multi-ray photoelectric sensors are similar to a basic photoelectric sensor, but with the addition of more light sources or light beams. Multi-ray simply means more than one light beam.

multi-beam photoelectric sensing

Is there a specific type or style of multi-ray photoelectric sensors?
Just like the basic, single beam photoelectric sensor, multi-ray photoelectric sensors can come in a large variety of sensing modes and housing styles. See the list below for a few examples:

Multi-Ray diffuse mode

Background suppression sensors - ML6, ML8, ML100
Distance measurement devices – R2100

Multi-Ray retroreflective mode

Retroreflective area sensors – RLG28

Multi-Ray thru-beam mode

Automation light grids – LGS, AL21
Slot light grids – RAL

What’s the advantage to using multi-ray photoelectric sensors?

Beam coverage

Multi-ray photoelectric sensors can offer numerous advantages. The addition of more light sources equates to a larger area of beam coverage. This is extremely helpful when the position of the object to be detected varies.

Photoelectric sensors beam coverage

Redundancy

More light beams can also improve detection reliability by adding redundancy. This is essential when detecting objects containing holes, grooves, or other surface irregularities.  For example, it is not uncommon for a printed circuit board (PCB) to contain many holes. Multiple beams provide a better degree of reliability by ignoring the various indentations, holes, and components on the PCB.

Multi-beam photoeyes

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Topics: Photoelectric Sensors

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