Optical Tape Measure May 04-30

1. Optical Tape MeasureMay 04-30 Team Members: Faculty Advisors: Nick Freese (EE) Dr. Aleksander Dogandzic Bruce Fu (EE) Dr. Degang Chen Jason Thompson (CprE) Client: Eugene Zimmer (EE) Senior Design Optical Tape Measure

2. Presentation Outline • Introduction • Project Activity Description • Resources and Schedules • Closing Materials Optical Tape Measure

3. Definitions • Laser Driver: a device used to generate a specified pulsed output voltage to a laser • Photodiode: semiconductor that produces current as a result of the absorption of photons • Resolution: the speed of our designs time to digital converter Optical Tape Measure

4. Introductory Materials Problem Statement Solution Approach Operating Environment Intended Users and Uses Assumptions and Limitations End Product Optical Tape Measure

5. Problem Statement • Standard tape measures are cumbersome • Difficult to use in complex environments • Ultrasonic devices have limited capabilities Optical Tape Measure

6. Solution Approach • Design an optical tape measure • Laser guided to designate the exact point of measurement Optical Tape Measure

7. Environment and Users • Operating environment considerations • Possible indoor and outdoor conditions • Physical abuse such as dropping • Intended Users • General home owners • Construction workers • Surveyors • Architects Optical Tape Measure

8. Intended Uses • General measurement • Surveying • Mining • Recreational sports • Industry Optical Tape Measure

9. Assumptions and Limitations • Assumptions • The object points to be measured are stationary • The reflecting surface will be sufficiently reflective and nearly perpendicular to the incident pulse • Limitations • Device must measure up to 100 feet • Accuracy must be within ± 0.5% • Dimensions must not exceed 6” x 8” x 3” • Cost of the prototype must be less than $355 • Device must be easily portable Optical Tape Measure

10. End Product • End product description • A small, durable, lightweight optical tape measure • A user’s manual • A maintenance manual • Test results Optical Tape Measure

11. Project Activities Accomplishments Definition Activities Approaches Considered Design Overview Implementation Activities Testing Optical Tape Measure

12. Accomplishments • Defined project specifications • Researched various technologies • Ordered necessary circuit components • Created an error model of the distance versus timer count • Nearly completed device functionality testing • Partially completed module integration testing Optical Tape Measure

13. Definition Activities • Two initial issues • Distance between two points or from the device • Interfacing with a computer to create a model of a room or building Optical Tape Measure

14. Approaches Considered • Possibilities • Pulse Time of Flight • Modulated Beam Systems • Triangulation Optical Tape Measure

15. Triangulation • Advantages • No high frequency timer or phase detector • Overall more simple • Less Expensive • Disadvantages • Less accurate • Requires at least two lasers • Setup cumbersome and inadaptable Optical Tape Measure

16. Modulated Beam System • Advantages • No high frequency timer • Fewer systematic error possibilities • Disadvantages • A high frequency modulator is needed • Less accurate at farther distances Optical Tape Measure

17. Pulse Time of Flight • Advantages • More accurate at farther distances • More information readily available • Times could be averaged over several pulses • Disadvantages • Requires a high frequency timer • Slightly more expensive • Ambient light could be problematic Optical Tape Measure

18. Design Overview Button Distance ≈ 3 * 108 m/s * 3.28 ft/m * time Display Microcontroller Transmitter Start Timer Receiver Stop Optical Tape Measure

19. Implementation Activities • Concerns • Resolution • Rise and fall times • Laser output power and pulsing capabilities • Optimal receiver wavelength • Operating voltage Optical Tape Measure

20. Implementation Activities • Time to digital converter • DEI laser driver Optical Tape Measure

21. Implementation Activities • OSRAM pulsed laser diode and photodiode • PIC microcontroller • LCD display SPL PL85 SFH 203 PFA Optical Tape Measure

22. Testing Activities • Functionality Tests • Individual modules • Module integration • Final system • Error Analysis Tests • Accuracy • Environmental effects Optical Tape Measure

23. Resources and Schedules Personnel Effort Other Resources Final Project Costs Schedules Optical Tape Measure

24. Personnel Effort Optical Tape Measure

25. Personnel Effort Optical Tape Measure

26. Other Resources Optical Tape Measure

27. Final Project Costs Optical Tape Measure

28. - Actual - Planned Schedules Optical Tape Measure

29. Closing Materials Project Evaluation Commercialization Recommendations for Additional Work Lessons Learned Risk and Risk Management Summary Optical Tape Measure

30. Project Evaluation • Problem Definition (Fully Met) • Research (Fully Met) • Technology Selection (Fully Met) • End Product Design (Fully Met) • Acquire All Parts (Fully Met) • Product Implementation (Partially Met) • Testing and Revisions (Partially Met) • Documentation (Fully Met) Optical Tape Measure

31. Commercialization • Capable of being fully commercialized • Production Cost: $264 • Street Cost: $343 • Possible market • Forestry, Surveying, Construction • Replace inaccurate ultra sonic measuring devices. Optical Tape Measure

32. Additional Work • Commercialized version requires • Working prototype • Increased functionality • Cost optimization Optical Tape Measure

33. Lessons Learned • Successful Project • Project Plan • Poster • Design/Final Report • Things to do differently • Ordering parts • Second semester communication • Plan more time for implementation Optical Tape Measure

34. Lessons Learned • Technical Knowledge Gained • Microcontroller use • LCD control • Lasers and photodiodes • Time to digital converter • Non-Technical Knowledge Gained • Communication importance • Time management considerations Optical Tape Measure

35. Risk and Risk Management • Anticipated Risks • Project Management • Kept communication lines open • Stuck to the project plan • Member Attitudes • Addressed problems early • Product Risks • Chose safe laser • Cut expensive parts Optical Tape Measure

36. Closing Summary • Problem • Ultrasonic Tape Measures • Inaccurate, hard to use • Solution • Optical Tape Measure • Time of laser flight • Accurate measurement Optical Tape Measure

37. Questions? Optical Tape Measure May 04-30 Optical Tape Measure