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Lighting Equipment Questions

Question Asked:

Could someone explain more about ‘Sheet Lighting’? I believe that it uses a structured light, but does it employ a line scan or area imager? Can it be done with an area imager (sensor)? Can someone tell me how to do this?

2 Answers

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Markus Tarin - President and CEO
moviMED
m [dot] tarin [at] movimed.com
(949) 699-6600

Hi Bill! The type of lighting you will need for your imaging application depends on several factors, such as the surface structure of your parts and what you would like to inspect. The term sheet of light is commonly used for 3D imaging using laser triangulation. We have some explanations on our website as well: http://www.movimed.com/moviSCAN_3D_Cameras.htm However, the best way to go about your application is to get a few sample parts in our imaging lab and to figure out the best way to enhance the contrast of the features of interest you are trying to examine or measure. If you can email me some photos of the parts I can comment on a possible approach. We have solved a lot of medical/health care type imaging applications.

Wallace Latimer - PLM - Machine Vision
FISBA
wallace [dot] latimer [at] coherent.com
(503) 454-5826

"Sheet of Light" as used in machine vision terminology is another name for structured line light illumination. It is used to extract a 3D profile from an object. It requires an area scan camera and often uses a laser line projector (although other illumination sources are possible). The line (or sheet) of light illuminates an object and creates a geometric structure related to the height of features on the object. To create a full image, the part is moved in front of the camera and illumination (or the imaging system is moved over the part), and many pictures are taken of the line geometry. Through proper calibration, image reconstruction and analysis, an accurate 3D point cloud of the object is obtained.

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