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Modifying Light

ALLED / 2011-12-28

Once a light is selected, a number of methods can be employed to modify light output, thereby increasing the efficiency of the inspection. Options include the use of filters for isolating a specific wavelength, strobing to stop motion or increase intensity, and color mixing to heighten contrast.

 

The effectiveness of a light is partly determined by the sensitivity of the camera (CCD) to specific wavelengths. A CCD with peak reception between 620-700nm will register more output from a 660nm (red) light than from a 470nm (blue) light.

 

Using Filters

Among other things, filters eliminate unwanted light, isolate specific colors, or decrease glare.  The filters currently available offer a wide range of options for controlling or enhancing the quality of light that reaches the CCD.

 

Polarized Lighting: Polarizing filters are used to limit the amount of glare from an object. Light is projected through a polarizing filter, and then imaged by the camera through an "analyzer."  Adjusting the orientation of the analyzer allows the viewer to modify the direction of the light collected by the camera.

 

Band Pass Filters: Allowing only a narrow range of wavelengths through to the camera, Band Pass Filters are useful in settings where ambient light creates a variable inspection envrionment.  These filters remove all but a specific range of light, eliminating the need for a shroud around an inspection area. Band pass filters are also useful for isolating a single color or a range of colors within an inspection.

 

Cut off filters will similarly prevent light above or below a specific wavelength from being visible to the camera.
 

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