Tutorial: Package, analyze, and validate an OpticStudio sequential file in LensMechanix. By Esteban Carbajal, Senior Optomechanical Engineer

Transcription

1 Tutorial: Package, analyze, and validate an OpticStudio sequential file in LensMechanix By Esteban Carbajal, Senior Optomechanical Engineer November

2 Introduction The Optical Performance Summary (OPS) is one of the most powerful analysis tools in LensMechanix to help you detect and visualize optomechanical design issues prior to building a physical prototype. Using the OPS, you can compare the performance of your complete system to the performance of the original OpticStudio design, assess the system on a pass/fail basis, and correct any issues. Learning objectives At the end of this tutorial, you will be able to: Load a sequential OpticStudio file in SOLIDWORKS using LensMechanix Utilize SOLIDWORKS tools to package an optical system in LensMechanix Analyze and verify the performance of a complete optomechanical system Identify mechanical components that may be degrading image quality Modify components to resolve performance issues, as measured against baseline data Resolve some common issues with optomechanical systems Load an OpticStudio file into LensMechanix 1. In SOLIDWORKS 2015 or later, click File > New > Assembly. 2. On the LensMechanix tab, select Input OpticStudio File. Figure 1. The Input OpticStudio File button in the Command Manager. 3. Click Browse. 4. Click Documents > Zemax > Samples > LensMechanix > 37 mm Heliar > Heliar 37mm SEQ.

3 Figure 2. The Load OpticStudio File dialog box. 5. Keep all check boxes selected to load all OpticStudio components and click OK. Close the window after the file loads. Note: If you clear the As read-only check box, you can modify the optical design in SOLIDWORKS. However, it s recommended that you modify the optical design in OpticStudio only. LensMechanix does not have optimization features for optical design. Package an optical system in LensMechanix 1. On the LensMechanix tab, click Construction Geometry > Show All. 2. On the Assembly tab, click Insert Components. 3. Click Browse. 4. Click Documents > Zemax > Samples > LensMechanix > 37 mm Heliar > SW Parts. 5. Select all components in the SW Parts folder and click Open. 6. Click in the SOLIDWORKS graphics area to place all the mechanical components near the optical system.

4 Figure 3. Mechanical components added to the assembly. 7. On the Assembly tab, click Mate. 8. Click the Multiple mate mode icon. 9. Select a local optical axis on one of the lenses to set as the common entity for concentric mates of all mechanical components. Figure 4. All components are concentric to the optical axis via Multiple mate mode. 10. Near the top of the graphics area, enable Section View.

5 11. In the Plane 1 section of the Section View PMP, select Right Plane and click the green check mark. 12. On the Assembly tab, click Mate. 13. To create a coincident mate, select the surface of the lens mount and the clear aperture of the last lens. 14. Repeat steps 12 and 13 for all mechanical components. 15. On the LensMechanix tab, click Construction Geometry > Hide All. Figure 5. A fully assembled optomechanical system. Analyze your optomechanical system 1. On the LensMechanix tab, click Create Prototype > Create Prototype Wizard. Figure 6. The Create Prototype Wizard in the Command Manager. 2. In the Analysis name field, type Ray Trace and click Next. 3. On the Analysis Settings page, select Image quality + scattering and click Next. 4. On the Ambient Conditions page, set the ambient conditions to 20 C and 1 ATM and click Next. 5. On the Wavelength page, click Next.

6 6. On the Surface Properties page, click Next. 7. On the Precision Settings page, set the slider to position 2 and click Next. Note: A Medium mesh setting corresponds to 100,000 rays and a scatter profile sample R of 5 degrees. 8. On the Allowable Delta page, click Next. 9. In the Optics Manager, browse to the Ignored Components section of the Computational Domain. 10. Right-click the mechanical component, select Add to Computational Domain, and then click the green check mark. Note: All components are included in the Computational Domain by default. To remove a component from the ray trace, click and drag it to the Ignored Components section. Figure 7. All components in an optomechanical system appear in the Computational Domain. 11. To define a scatter profile for the component, in the Mechanical Components section of the Input Tree, right-click the part that you created and click Edit Surface Properties.

7 Figure 8. Use the Edit Surface Properties feature to select a scatter profile. Figure 9. The Scatter Profile drop-down menu appears in the Mechanical Component Editor. 12. In the Mechanical Component Editor, select Black Paint 1% Reflectance Visible > Apply to Component from the Scatter Profile drop-down menu. 13. Click the green check mark. 14. To select all remaining components, click the first component, hold SHIFT, right-click the last mechanical component, and select Edit Surface Properties. Figure 10. Edit Surface Properties of multiple components simultaneously. 15. Repeat steps 11 to 13 to apply the scatter profile to all mechanical components.

8 Validate the performance of the complete optomechanical system 1. In the Command Manager, click Run Ray Trace. 2. In the Run Ray Trace PMP, select Baseline ray trace and Full ray trace, and then click Run. Note: A baseline ray trace considers only optical components in the Computational Domain. A full ray trace calculates the ray trace using both the optical and mechanical components in the Computational Domain. 3. When the ray trace is complete, click the green checkmark. 4. In the Command Manager, click Display OPS. The status indicator on the Beam clipping tab appears in red. 5. Select the Beam clipping tab. The beam clipping LensMechanix Output cell changes to red, indicating a variation from the original optical performance that is outside of the defined allowable delta. Figure 11. Red OPS status indicator shows beam clipping value is greater than the allowable delta. 6. To display the beam clipping rays, click Display Clipped Rays. 7. Enable Section View in the graphics area. 8. In the Optics Manager, right-click Beam clipping rays and select Edit. 9. In the Edit Rays PMP, increase the number of rays from 25 to In the Edits Rays PMP, change the type of ray from Lines to Lines with fletches and click OK.

9 A B Figure 12. Right-click Beam clipping rays (A) to open the Edit Rays PMP (B). 11. In the Optics Manager, right-click the other ray group, Rays XX, and select Hide. Note: XX represents a random number that may not be identical to the number in Figure Right-click Beam clipping rays and select Edit. Figure 13. Hide the other ray set that was automatically generated during the first ray trace. 13. In the Command Manager, click Display Outputs > Ray Animation. 14. To visualize how the beam clipping rays travel through the assembly, in the Ray Animation PMP, set the Speed to Fast and click Play. Note: Ray animation is typically best viewed with Section View enabled.

10 15. Notice that there are several rays that reflect from the chamfered edge of the pressure ring. This is likely causing the beam clipping value to be greater than the defined allowable delta. Pressure ring Figure 14. The pressure ring in the optomechanical assembly. 16. To modify the pressure ring, right-click it and select Edit Part. Figure 15. Edit the pressure ring to make modifications. 17. In the FeatureManager Design Tree, expand the Pressure Ring component. 18. Right-click Chamfer1 and select Edit Feature.

11 Figure 16. Edit the Chamfer1 feature of the pressure ring. 19. In the Chamfer1 PMP, edit the chamfer distance from 1.5mm to 2.5mm and click OK. Figure 17. Chamfer1 settings. 20. Exit Edit Part mode and click Rebuild.

12 Figure 18. The Rebuild button is located on the SOLIDWORKS menu bar. 21. In the Command Manager, click Run Ray Trace. 22. In the Run Ray Trace PMP, select the Full ray trace check box and click Run. 23. In the Command Manager, click Display OPS. 24. In the OPS, verify that all tab status indicators are green. Note: In the OPS, green status indicators show that the measured values are within the acceptable ranges that have been defined. Figure 19. Green OPS status indicator shows beam clipping value is less than the allowable delta. Congratulations! You have successfully validated a complete optomechanical system using the OPS in LensMechanix.