Make sense of lens specs: understand lens specifications before you design a vision system.(INSPECTION)

From: Test & Measurement World | Date: September 1, 2005| Author: | Copyright information

In a machine-vision system, a camera lens serves one purpose: It gathers light and focuses an image on the camera's sensor. Thus, vision-system designers must treat lenses as key elements in inspection equipment. If cameras cannot gather light and properly "see" what engineers need to inspect, they cannot provide good inspection results. The following sections explain specifications found in lens data sheets and relate them to image-acquisition needs.

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WAVELENGTH RANGE. The wavelengths of light that a camera must detect determine which type of lens ...

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