Laser triangulation measurement for machine vision
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Firstsight Vision product story
Edited by the Manufacturingtalk editorial team
Jun 7, 2007
Firstsight Vision has developed a laser tool for measuring the height of objects in machine vision applications using triangulation.
Firstsight Vision has developed a set of tools designed primarily to measure the height of objects in machine vision applications using laser beam triangulation.
These laser measurement tools form part of the latest Sherlock 7 machine vision software from ipd and further extend its comprehensive range of capabilities for automated inspection applications.
The tools can also be applied to the inspection of any component that has a bright or dark line-like structure, even if it is not generated by a laser.
The tools are laser height, laser caliper, laser line and laser points.
The laser height algorithm measures the height profile of an object along a laser line using laser triangulation.
An extremely simple set up routine requires only the measurement of three known heights.
Unlike other systems, the geometry of the laser-object camera does not need to be measured.
The new approach can be 5-10 times more accurate than existing "laser approximation" methods.
In addition, the algorithm can suppress reflections from shiny components such as those made from metal.
The other laser tools allow various parameters of the laser line (or other straight lines) to be determined.
The laser caliper measures the line width and edge positions to allow the centre of the line to be calculated accurately.
The laser line tool fits a line to a nearly horizontal or vertical line using a least squares fit, having first removed any data points far outside the norm.
Both of these tools are particularly useful on noisy (or "speckled") lines.
The laser points tool gives the side and centre positions of the line.
The versatile Sherlock automated quality inspection tool offers the flexibility to adapt to changing inspection needs and can be used in mono, colour and multi-camera applications.
In addition to the options of ipd's integrated compact vision appliances, or NetSight II compact vision system, Sherlock is compatible with a range of cameras using a PC/framegrabber platform.
It is compatible with analogue, CameraLink (area or linescan), FireWire and Gigabit Ethernet cameras.
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Tel +44 1252 780 000
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A compact machine vision system has all the processing power in a rugged enclosure and allows small cameras to be used, while the unit itself can be readily integrated into factory environments.
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