Critical Design Review 05/12/2006 Team Members: Andrew Shabashevich, Greg Penoyer, Jessica Pierce, Tony Kukla, Bill Dugan, Gaurav Sanghi, Piyush Aggarwala Team Mentor: Dr. Edward Hensel Kate Gleason College of Engineering Rochester Institute of Technology Automated Bubble Elimination System #P06219

 Design and build a stand-alone system to reduce the number of bubbles on a contact lens and in the water cell 75% Bubble Reduction 75% Bubble Reduction  Design the system with potential to be integrated into the automated production line (freedial) machine at a later date Keep the same dimensional constraints Keep the same dimensional constraints Keep the same power/operating sources Keep the same power/operating sources Operate within current cycle time Operate within current cycle time Not interfere with Wet Vision Inspection Not interfere with Wet Vision Inspection Mission Statement

 Conducted background research  Brainstormed for concepts  10 Initial concepts tested qualitatively  Chose 3 for quantitative tests in SD II Ultrasound, Rotary Motion, Recirculation Ultrasound, Rotary Motion, Recirculation Test with and without degassed water Test with and without degassed water  Designed Test fixture Senior Design I Milestones

 Assemble/Install Test Fixture  Assess the 3 concepts in more detail: DOEDOE Settling time/Time studySettling time/Time study Cost Benefit AnalysisCost Benefit Analysis  Quantitatively prove concept feasibility  Propose final solution to B&L Objectives for Senior Design II

 Test fixture used with Bausch & Lomb one-up vision inspection system stand  Fixture is modular to quantitatively test all final concepts  Fixture is easy to adjust and modify during testing Design Test Fixture

Test Fixture Set-up Sliding Stage Water Cell

 Create bubbles on a contact lens  Take a before picture of the lens  Apply Test  Take an after picture of the lens  Run the images through wet vision inspection algorithm  Record bubble count and bubble area Testing Procedure

Rotary Motion Module Parameters to Vary

Rotary Motion Testing Results Non degassed, De-ionized Water Degassed, De-ionized Water

Ultrasonic Module Parameters to Vary

Ultrasound Testing Results Non degassed, De-ionized water Degassed, De-ionized water Live Run with Degassed, De-ionized water

Recirculation Module Parameters to Vary

Recirculation Testing Results Degassed, De-ionized water

Results – Percent Bubble Reduction

Results – Bubbles Remaining on Lens

Cost Benefit Analysis

 Ultrasound Consistent bubble reduction: Consistent bubble reduction: < 1 average bubbles per lens < 1 average bubbles per lens Settling time < 1 sec Settling time < 1 sec Less moving parts Less moving parts   Operating Conditions Frequency – 20 kHz Frequency – 20 kHz Max. Power – 15 W Max. Power – 15 W Tip Diameter – 14 mm Tip Diameter – 14 mm Concentric to the water cell Concentric to the water cell 0.25” below water line 0.25” below water line Recommendation Time (s) Power (W)

 Method for eliminating over 99% of bubbles on a contact lens  Technical package Background Research Background Research Vender Research Vender Research  CD package Complete test data Complete test data Test fixture design package Test fixture design package Detailed feasibility test reports Detailed feasibility test reports Deliverables

Questions?