For the way we set up, the final decrease in system design is 0.0236 waves rms, and the compensator has a range of freedom of 6.1854 mm going positive or negative direction. For our homework assignment the assembly tolerance was assigned to be 0.04 waves rms, thus we need to modify out set up to meet this value. Since we know that there are 34 possible perturbation parameters, the desired input for decrease in system performance can be calculated as following: RMS = , where x is the value of decrease in system performance X = = = 0.00685994 Repeat procedure step 1 through 6 with this value set as the decrease in performance. The new plot now indicates that the probability for the system to have 0.04 waves rms is now about 63%. Now, let’s make a quick comparison between the sensitivity analysis found through CodeV’s automatic tolerance function and the sensitivity analysis we found in homework 3 using manual perturbations. As the above table indicates, the sensitivity for decenter on lens 1(DSX S2..3) and lens 2(DSX S4..5), the sensitivity can be calculated by the following equation: DeCenter 1 = 0.0193 / 0.1 = 0.193 λ/mm DeCenter 2 = 0.0193 / 0.1 = 0.193 λ/mm As for tilt from lens 1(BTY S2..S3) and lens 2(BTY S4..S5), it can be calculated as the following:
For the way we set up, the final decrease in system design is 0.0236 waves rms, and the compensator has a range of freedom of 6.1854 mm going positive or negative direction. For our homework assignment the assembly tolerance was assigned to be 0.04 waves rms, thus we need to modify out set up to meet this value. Since we know that there are 34 possible perturbation parameters, the desired input for decrease in system performance can be calculated as following: RMS = , where x is the value of decrease in system performance X = = = 0.00685994 Repeat procedure step 1 through 6 with this value set as the decrease in performance. The new plot now indicates that the probability for the system to have 0.04 waves rms is now about 63%. Now, let’s make a quick comparison between the sensitivity analysis found through CodeV’s automatic tolerance function and the sensitivity analysis we found in homework 3 using manual perturbations. As the above table indicates, the sensitivity for decenter on lens 1(DSX S2..3) and lens 2(DSX S4..5), the sensitivity can be calculated by the following equation: DeCenter 1 = 0.0193 / 0.1 = 0.193 λ/mm DeCenter 2 = 0.0193 / 0.1 = 0.193 λ/mm As for tilt from lens 1(BTY S2..S3) and lens 2(BTY S4..S5), it can be calculated as the following:
Tolerancing-in-CodeV-tutorial-Lai.docx