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Carl Zeiss - Active Scanning  

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Active Versus Passive Scanning for Multi-Point Measurement

The distinction between touch-trigger (single point) measurement and contact scanning is well known. And there are two types of contact scanning technologies: passive and active. Both record surface data based on the movement of a stylus connected to a scanning head. The difference is what goes on inside the scanning head. The more complex a measured surface becomes, the greater the advantage of an active scanning system.


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