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Optical Tape Measure May 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. Presentation Outline. Introduction

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optical tape measure may 04 30

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

presentation outline
Presentation Outline
  • Introduction
  • Project Activity Description
  • Resources and Schedules
  • Closing Materials

Optical Tape Measure

definitions
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

introductory materials

Introductory Materials

Problem Statement

Solution Approach

Operating Environment

Intended Users and Uses

Assumptions and Limitations

End Product

Optical Tape Measure

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

Optical Tape Measure

solution approach
Solution Approach
  • Design an optical tape measure
  • Laser guided to designate the exact point of measurement

Optical Tape Measure

environment and users
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

intended uses
Intended Uses
  • General measurement
  • Surveying
  • Mining
  • Recreational sports
  • Industry

Optical Tape Measure

assumptions and limitations
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

end product
End Product
  • End product description
    • A small, durable, lightweight optical tape measure
    • A user’s manual
    • A maintenance manual
    • Test results

Optical Tape Measure

project activities

Project Activities

Accomplishments

Definition Activities

Approaches Considered

Design Overview

Implementation Activities

Testing

Optical Tape Measure

accomplishments
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

definition activities
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

approaches considered
Approaches Considered
  • Possibilities
    • Pulse Time of Flight
    • Modulated Beam Systems
    • Triangulation

Optical Tape Measure

triangulation
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

modulated beam system
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

pulse time of flight
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

design overview
Design Overview

Button

Distance ≈ 3 * 108 m/s * 3.28 ft/m * time

Display

Microcontroller

Transmitter

Start

Timer

Receiver

Stop

Optical Tape Measure

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

Optical Tape Measure

implementation activities20
Implementation Activities
  • Time to digital converter
  • DEI laser driver

Optical Tape Measure

implementation activities21
Implementation Activities
  • OSRAM pulsed laser diode and photodiode
  • PIC microcontroller
  • LCD display

SPL PL85

SFH 203 PFA

Optical Tape Measure

testing activities
Testing Activities
  • Functionality Tests
    • Individual modules
    • Module integration
    • Final system
  • Error Analysis Tests
    • Accuracy
    • Environmental effects

Optical Tape Measure

resources and schedules

Resources and Schedules

Personnel Effort

Other Resources

Final Project Costs

Schedules

Optical Tape Measure

personnel effort
Personnel Effort

Optical Tape Measure

personnel effort25
Personnel Effort

Optical Tape Measure

other resources
Other Resources

Optical Tape Measure

final project costs
Final Project Costs

Optical Tape Measure

schedules

- Actual

- Planned

Schedules

Optical Tape Measure

closing materials

Closing Materials

Project Evaluation

Commercialization

Recommendations for Additional Work

Lessons Learned

Risk and Risk Management

Summary

Optical Tape Measure

project evaluation
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

commercialization
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

additional work
Additional Work
  • Commercialized version requires
    • Working prototype
    • Increased functionality
    • Cost optimization

Optical Tape Measure

lessons learned
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

lessons learned34
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

risk and risk management
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

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

Optical Tape Measure

questions

Questions?

Optical Tape Measure

May 04-30

Optical Tape Measure