IMAGING OPTICS - Kendall Group
Transcript of IMAGING OPTICS - Kendall Group
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
TOPICS FOR DISCUSSION • Why are we here? • Imaging Best Practices
– Allow room for your imaging system to grow
– Working distance to field of view ratio
– Choose the right illumination – The importance of color – Resolution and depth of field – No lens can solve every
application • Closing remarks • Questions
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
#1. ALLOW ROOM FOR YOUR IMAGING SYSTEM
In order to achieve certain levels of performance many systems need to grow larger
High Resolution optics
generally require larger diameters and can not compromise size easily
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
For measurement applications very large optics can be required. For a 100mm FOV a lens could be 170mm in diameter
Lighting can grow very large especially for large objects and objects that are very reflective
Some illumination types will require optics that have very long working distances
#1. ALLOW ROOM FOR YOUR IMAGING SYSTEM
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
#2. CREATE THE RIGHT WORKING DISTANCE TO FIELD OF VIEW RATIO
It is possible to get wide fields of view at short working distances. However performance usually drops severely.
A working distance to field of view
ratio of between 2 and 4 to 1 is recommend to gain higher performance at the most reasonable price.
35mm lens
4.5mm lens
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
#3. CHOOSE THE RIGHT ILLUMINATION
Standard Backlight Illumination
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
#3. CHOOSE THE RIGHT ILLUMINATION
Telecentric Illumination
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
#3. CHOOSE THE RIGHT ILLUMINATION
PROPRIETARY - Property of Edmund Optics, Inc. | 2013 Copyright© Edmund Optics, Inc.
# 4. COLOR (WAVELENGTH) MATTERS
3b
660nm Light 470nm Light
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
# 4. COLOR (WAVELENGTH) MATTERS
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
# 4. COLOR (WAVELENGTH) MATTERS
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
# 5. YOU HAVE TO COMPROMISE BETWEEN RESOLUTION AND DOF
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
# 5. RESOLUTION AND DOF TRADE OFF
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
# 6. NO LENS CAN SOLVE EVERY APPLICATION
To obtain the highest levels of performance many lenses will have to be employed to solve different applications.
This is due to the way optical aberrations behave making it impossible to have one catch-all lens.
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
# 7. UNDERSTAND WHAT YOU ARE LOOKING AT AND NEED TO ACHIEVE
The properties of an object and the desired results will drive the final system make up.
Bring all variations
and marginal parts into the discussion early on.
PROPRIETARY - Property of Edmund Optics, Inc. | 2011 Copyright© Edmund Optics, Inc.
# 8. ASK LOTS OF QUESTIONS
Understanding why a system or imaging component will or will not work is critical for success.
Suppliers should welcome
your questions and be able to give you a good explanation about what your expectations should be.