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40X 0.65NA Microscope Objective Tolerance Analysis PowerPoint Presentation
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40X 0.65NA Microscope Objective Tolerance Analysis - PowerPoint PPT Presentation


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40X 0.65NA Microscope Objective Tolerance Analysis. Background. For a complete microscope design, tolerance analysis is a necessary process which including:. Determine the value of manufacturing and assembly tolerances. Determine the compensational component for manufacturing and assembly.

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Presentation Transcript
background
Background

For a complete microscope design, tolerance analysis is a necessary process which including:

  • Determine the value of manufacturing and assembly tolerances.
  • Determine the compensational component for manufacturing and assembly.
  • Determine the manufacturing and assembly yields.
specification and tolerance
Specification and Tolerance

Microscope Objective Specification and Tolerance Analysis Criterion

  • Magnification: 40X
  • Numerical aperture: NA 0.65
  • Visible wavelength: DFC
  • MTF:0.63@450lp/mm,
  • Tolerance criterion: RMS spot, RMS wavefront, MTF. The tolerance for this lens is MTF >0.45.
analysis of tolerances identify the existing issues
Analysis of Tolerances -Identify the Existing Issues

Criterion: Diffraction MTF average S&T at 450.0000 cycles per mm

Nominal Criterion: 0.63

Worst offenders:

Type Value Criterion Change

TSDX 7 0.02000000 0.40276905 -0.22645096

TSDX 7 -0.02000000 0.40276905 -0.22645096

TSDY 7 -0.02000000 0.40276905 -0.22645096

TSDY 7 0.02000000 0.40276906 -0.22645096

TSDX 6 0.02000000 0.44345454 -0.18576548

TSDX 6 -0.02000000 0.44345454 -0.18576547

TSDY 6 -0.02000000 0.44345454 -0.18576547

TEDY 5 7 0.02000000 0.45596137 -0.17325864

TEDY 5 7 -0.02000000 0.45596137 -0.17325864

TEDX 5 7 -0.02000000 0.45596138 -0.17325863

Estimated Performance Changes based upon Root-Sum-Square method:

Nominal MTF : 0.63

MTF=0.047

Estimated change : -0.58201878

Estimated MTF : 0.04720123

Compensator Statistics:

Thickness Surf 11:

Preliminary conclusion lead our production team to focus on surface accuracy and elements wedge

tolerance that might be the causes of production issues.

repeat analysis of tolerance
Repeat Analysis of Tolerance

Criterion: Diffraction MTF average S&T at 450.0000 cycles per mm

Nominal Criterion: 0.63

Worst offenders:

Type Value Criterion Change

TFRN 7 -5.00000000 0.56361483 -0.07021743

TTHI 10 11 -0.03000000 0.56707180 -0.06676045

TTHI 6 7 -0.03000000 0.60750372 -0.02632854

TFRN 6 5.00000000 0.60830201 -0.02553025

TSDX 7 -0.00500000 0.61591890 -0.01791336

Estimated Performance Changes based upon Root-Sum-Square method:

Nominal MTF : 0.63

Estimated change : -0.09456633

Estimated MTF : 0.53926593

MTF>0.45

Compensator Statistics: Thickness Surf 11:

MTF>0.45

monte carlo analysis
Monte Carlo Analysis:

Number of trials: 10

Initial Statistics: Normal Distribution

Trial Criterion Change

    • 1 0.63378092 -5.1336E-005
      • 2 0.62090660 -0.01292565
  • 3 0.61386375 -0.01996850
  • 4 0.48238259 -0.15144967
  • 5 0.61324670 -0.02058555
  • 6 0.60359581 -0.03023644
  • 7 0.58464931 -0.04918295
    • 8 0.53216035 -0.10167191
  • 9 0.63535256 0.00152030
  • 10 0.60603088 -0.02780138

Number of traceable Monte Carlo files generated: 10

Nominal 0.63383226

Best 0.63535256 Trial 9

Worst 0.48238259 Trial 4

90% > 0.50727147

80% > 0.55840483

50% > 0.60963879

20% > 0.62734376

10% > 0.63456674

conclusion
Conclusion

Tight active radius tolerance, irregularity tolerances, thickeness tolerance, and tolerance Nd /Vd (glass materials) can be achieved when using high end manufacturing equipment, but the wedge tolerance for component fabrication and assembly might be more challenging for production.

To achieve the desired manufacturing objectives, the most commonly used method is ensuring the each individual optical component accuracy, followed by tightening the tolerance of the lens barrel (mechanical assembly)

In short, Zemax tolerance analysis provides a very good guideline for our optical component manufacturing and assembly.