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

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Presentation Outline

• Introduction
• Project Activity Description
• Resources and Schedules
• Closing Materials

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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

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Introductory Materials

• Problem Statement
• Solution Approach
• Operating Environment
• Intended Users and Uses
• Assumptions and Limitations
• End Product

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Problem Statement

• Standard tape measures are cumbersome
• Difficult to use in complex environments
• Ultrasonic devices have limited capabilities

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Solution Approach

• Design an optical tape measure
• Laser guided to designate the exact point of
  measurement

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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

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Intended Uses

• General measurement
• Surveying
• Mining
• Recreational sports
• Industry

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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

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End Product

• End product description
• A small, durable, lightweight optical tape
  measure
• A users manual
• A maintenance manual
• Test results

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Project Activities

• Accomplishments
• Definition Activities
• Approaches Considered
• Design Overview
• Implementation Activities
• Testing

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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

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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

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Approaches Considered

• Possibilities
• Pulse Time of Flight
• Modulated Beam Systems
• Triangulation

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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

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Modulated Beam System

• Advantages
• No high frequency timer
• Fewer systematic error possibilities
• Disadvantages
• A high frequency modulator is needed
• Less accurate at farther distances

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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

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Design Overview
Button
Distance 3 108 m/s 3.28 ft/m time
Microcontroller
Transmitter
Display
Start
Timer
Receiver
Stop
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Implementation Activities

• Concerns
• Resolution
• Rise and fall times
• Laser output power and pulsing capabilities
• Optimal receiver wavelength
• Operating voltage

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Implementation Activities

• Time to digital converter
• DEI laser driver

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Implementation Activities

• OSRAM pulsed laser diode and photodiode
• PIC microcontroller
• LCD display

SPL PL85
SFH 203 PFA
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Testing Activities

• Functionality Tests
• Individual modules
• Module integration
• Final system
• Error Analysis Tests
• Accuracy
• Environmental effects

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Resources and Schedules

• Personnel Effort
• Other Resources
• Final Project Costs
• Schedules

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Personnel Effort
Team Member Hours
Freese, Nick 161
Fu, Bruce 155
Thompson, Jason 157
Zimmer, Eugene 153
Total 626
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Personnel Effort
26
Other Resources
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Final Project Costs
Items Cost
Poster 68.00
Laser Driver 169.00
Electronic Components 69.79
Sub Total 306.79
Labor at 10.00 per hour
Freese, Nick 1610
Fu, Bruce 1550
Thompson, Jason 1570
Zimmer, Eugene 1550
Total 6586.79
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Schedules
Tasks Sept. Oct. Nov. Dec. Jan. Feb. March April May
Project Definition
Technology Research
Final Design
Implementing
Testing
Documenting Reporting
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Closing Materials

• Project Evaluation
• Commercialization
• Recommendations for Additional Work
• Lessons Learned
• Risk and Risk Management
• Summary

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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)

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Commercialization

• Capable of being fully commercialized
• Production Cost 264
• Street Cost 343
• Possible market
• Forestry, Surveying, Construction
• Replace inaccurate ultra sonic measuring devices.

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Additional Work

• Commercialized version requires
• Working prototype
• Increased functionality
• Cost optimization

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Lessons Learned

• Successful Project
• Project Plan
• Poster
• Design/Final Report
• Things to do differently
• Ordering parts
• Second semester communication
• Plan more time for implementation

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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

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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

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Closing Summary

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

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Questions?

• Optical Tape Measure
• May 04-30