PRT used in Pepperl and Fuch sensors
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Pepperl+Fuchs GB product story
Edited by the Engineeringtalk editorial team
Jun 16, 2009
Pepperl and Fuchs has refined its pulse-ranging technology (PRT) so that it can be used in sensors of all sizes for a range of industrial applications.
Unlike indirect measuring processes such as phase-correlation and analogue chip-based processes, the PRT technique measures distance directly.
The superiority of pulse-ranging technology is primarily due to the transmission of light pulses containing energy up to a thousand times more intense than sensors emitting permanent light beams.
A laser diode transmits short pulses of light, which are reflected back from the target object and detected by a light-sensitive receiver element; the time-of-flight measurement is then used to calculate distance.
Other methods of measurement can be substantially affected by environmental issues such as extraneous light, surface colour and quality, moving objectives and interference from other sensor systems, but PRT is immune to these influences.
The Pepperl and Fuchs portfolio includes several sensors with PRT.
The cost-effective VDM28 distance sensor is enclosed in a standard photoelectric sensor housing and has a measurement range of 8m, suitable for a range of tasks.
The VDM100 distance measurement device offers a maximum range of 300m, a repeat accuracy degree of <0.5mm and is ideal for rapid precision positioning.
The VDM70 has a maximum range of 250m and is suitable for the simple positioning of gantry cranes, lifters, elevator cars or for measurement tasks, while the VDM54 with a maximum range of 6m is optimised for collision-prevention applications on overhead conveyor systems.
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