A tutorial on the use of ZEMAX and Solidworks in athermal lens mount design By James Champagne OPTI 521 – Optomechanical Engineering Fall 2010.

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Presentation transcript:

A tutorial on the use of ZEMAX and Solidworks in athermal lens mount design By James Champagne OPTI 521 – Optomechanical Engineering Fall 2010

 Goal is to design a lens mount to compensate defocus caused by temperature changes  Space Environment (Assume Δ T = 60 C)  Remote Sensing Infrared Optical System  ZEMAX  Solidworks

 75 mm F/3 Double Gauss  3-5 μ m Wavelengths  20 Degree Full Field of View

 AMTIR1 (Amorphous)  Dn/dT = 72 ppm/C α = 12 ppm/C n =  IRG100 (Chalcogenide)  Dn/dT = 103 ppm/C α = 15 ppm/C n =  CaF2  Dn/dT = ppm/C α = 18.4 ppm/C n =  MgF2  Dn/dT = 0.88 ppm/C α = 9.4 ppm/C n =  BaF2  Dn/dT = -16 ppm/C α = 18.4 ppm/C n = 1.457

Al 2024 Lens Barrel

General Tab Adjustment

Lens Data Editor at 20 C and 1 atm (units:inches)

-Scroll to right side of Lens Data Editor -Enter CTE data of lens mount in airspaces -Al 2024 α = 22.9 ppm/C

-Open Multi-Configuration Editor -Make Thermal under Tools

-Choose number of configurations -Temperature range from 0 C to 60 C

-Change pressure to 0 for space environment

-Choose Config 2 and Make Single Config under Tools

-Lens Data Editor at 0 C and 0 atm pressure -Optimize BFL for minimum RMS spot radius -New BFL = inches

-Repeat and choose Config 4 for 60 C and 0 atm pressure -Lens Data Editor now at 60 C and 0 atm pressure -Optimize BFL for minimum RMS spot radius -New BFL = inches

 The change in BFL between 0 C and 60 C is:  inches = 91 μ m  Focus moves towards lens for increase in T

 Lens/Detector interface mount must move detector plane towards lens for increase in temperature  High-Expansion material – Al 6061  Low-Expansion material – Invar 36

 Bi-metallic lens mount to compensate defocus  Infrared optical system in space environment  Warnings  dn/dT and α not constant over large T  Check data input of ZEMAX

 Friedman, I., “Thermo-optical analysis of two long-focal- length aerial reconnaissance lenses,” Opt. Eng. 20, 1981:161.  Vukobratovich, D, Introduction To Opto-Mechanical Design, Raytheon Systems Co., Tucson, AZ.  Yoder, P.R., Jr., Mounting Optics in Optical Instruments, SPIE Press, Bellingham, WA,  Zemax Corporations. Zemax Optical Design User’s Manual. Chapter 19: Thermal Analysis (April 2010).  Zemax Knowledge Base Analysis/ Analysis/