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VOB Basic Sample: Telecentric System

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    Fig. 6-1 shows a system with a double lens (f =94 mm). The aperture stop (30 mm) is located at the lens. Object width and image width are both 2 * 94 mm, resulting in an 1 : 1 projection.

Fig. 6-1: Simple system with double lens

Fig. 6-2 shows a the same system converted to a basic telecentric system as it is used in metrology. The aperture stop (3 mm) is now located at the focus F` (94 mm), being the exit pupil. The entrance pupil is in infinity (to the left). Principal rays are parallel to the optical axis at the object and go through the focus. A displacement of the object does (more or less) not affect the image height of the projection on the screen (most right), magnification is constant. The object heights are 0, 5, and 10 mm for the yellow, green and red ray bundles, respectively.

Fig. 6-2: Telecentric system with aperture stop of 1 mm

Fig. 6-2 shows a record of the corresponding spot size for three object heights. Note the increasing chromatic aberration (false colors) with increasing object height.

See also how the independance of magnification from the object distance can be easily demonstrated by by VOB++ using the animation feature: Telecentric system.

More samples?
The trial version of VOB Pro with Micro Optics plug-in contains hundreds of samples covering nearly any application of optical design programs. Use these samples as starting points for own designs.

See the Feature Table for a summary of features supported in each edition.

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