IMAGING OPTICS - Kendall Group

IMAGING OPTICS

Nick Sischka Senior Vision Solutions

Engineer

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


WHY ARE WE HERE


#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


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


#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


#3. CHOOSE THE RIGHT ILLUMINATION

Standard Backlight Illumination



Telecentric Illumination


# 4. COLOR (WAVELENGTH) MATTERS

3b

660nm Light 470nm Light


# 4. COLOR (WAVELENGTH) MATTERS


# 5. YOU HAVE TO COMPROMISE BETWEEN RESOLUTION AND DOF


# 5. RESOLUTION AND DOF TRADE OFF


# 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.


# 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.


# 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.


# 9. UNDERSTAND THE FUNDAMENTALS OF AN IMAGING SYSTEM

Image Quality

Defined at a Resolution and Contrast

Image Quality

Resolution

Distortion

Depth of Field

Perspective

Contrast

IMAGING OPTICS - Kendall Group

Documents

Transcript of IMAGING OPTICS - Kendall Group