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OPTI 201R 10 L29

# OPTI 201R 10 L29 - Entrance pupil The stop or image of the...

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OPTI 201R Fall 2010 29-1 9.1.2 Telecentric Pupil Location In a telecentric system, one or both of the pupils are located at infinity. ! Telecentric in object space " \$%& &’\$()’*& +,+-. -/ .0*)\$&1 )\$ - 2 - the chief ray is parallel to the axis in object space - the magnification is constant as the object moves in and out of focus - microscope objectives - optical systems used for metrology ! Telecentric in image space " \$%& &3-\$ +,+-. -/ .0*)\$&1 )\$ 42 - the chief ray is parallel to the axis in image space - the image size is constant even if the film or CCD moves ! Doubly telecentric infinity - the chief ray is parallel to the axis in object and image space Figure 9.5 Telecentric system in object and image space (doubly telecentric).

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OPTI 201R Fall 2010 29-2 9.1.3 Aperture Stop Determination ! The element that forms (becomes) the aperture stop within an optical system depends on the object location…. .?????!!

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Unformatted text preview: ! Entrance pupil : The stop or image of the stop (in object space) that subtends the smallest angle from the axial point of the object is the entrance pupil. ! Exit pupil : The stop or image of the stop (in image space) that subtends the smallest angle from the axial point of the image is the exit pupil. ! Consider object points "A" and "B": Figure 9.6 Determining which surface is the aperture stop in object space. OPTI 201R Fall 2010 29-3 ! For object point "A", AS is the aperture stop. ! For object point "B", L 2 is the aperture stop. "The entrance pupil formed by the image of lens 2 (L 2 ) limits the ray bundle originating from an object at point 2, so for this object, distance lens L2 is the aperture stop." (pg. 235) OPTI 201R Fall 2010 29-4 Figure 9.7 The entrance pupil, exit pupil, and aperture are all conjugates. Figure 9.8 Two lenses without a given aperture stop; The aperture stop is object location dependent....
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OPTI 201R 10 L29 - Entrance pupil The stop or image of the...

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