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Title:

Optical Mounting System for Laboratory Research

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Optical components can be adjusted easily to improve image quality Questions Photo generated during testing of Schlieren imaging configurations . Title: – PowerPoint PPT presentation

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Learn more at: http://web.cecs.pdx.edu
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Title: Optical Mounting System for Laboratory Research


1
Optical Mounting System for Laboratory Research
  • Group Members
  • Nicholas Hamilton
  • Michael Kukla
  • Melissa Martin
  • Michael Mastin
  • Academic Advisor
  • Dr. Raul Bayoan Cal

2
Introduction
  • PSU Mechanical Engineering Department is
    installing a wind tunnel on the first floor of
    the Engineering Building.
  • It is essential to be able to image the airflow
    moving past fixed objects in the test area to
    study boundary layer effects, turbulent kinetic
    energy, and heat transfer effects.
  • A system is required to mount the imaging
    components.

3
Design process and specifications
  • Customer interview
  • Problem Statement
  • Provided basis for PDS
  • Operable by a single user
  • Travel the entire length of the wind tunnel
  • Hold an array of optics and imaging equipment
  • Enable varied focal depths through the test
    chamber

4
Design process and specifications
  • Brainstorming session
  • Identified key components (base, frame, and
    materials)
  • Design ideas reviewed after two minute intervals
  • Individual ideas for components were critiqued
  • Best design features were implemented in initial
    designs
  • External search
  • Modified single-mirror off-axis schlieren
    photography configuration was selected
  • Patent search
  • Potential fabrication materials researched

5
Design process and specifications
  • Solid models of each design were generated and
    compared using SolidWorks
  • A decision matrix was used to determine the best
    aspects of each design

6
Design process and specifications
  • Designs were streamlined
  • Upon review by the customer, design
    specifications
  • changed

7
Schedule and milestones
Optical Mounting System Optical Mounting System Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d) Weekly Start Dates (m/d)
Task Number Task Name 1/4 1/18 2/8 2/15 2/22 3/1 3/8 3/15 3/22 4/5 4/19 5/3 6/7
1 PDS Development                          
2 Initial Design                          
3 External/Internal Search                          
4 Design Evaluation and Selection                          
5 Progress Report                          
6 Materials Testing                          
7 Detailed Design Development                          
8 Prototype Building                          
9 Prototype Testing                          
10 Finish Documentation                          
8
Imaging Setup
Modified single-mirror off-axis Schlieren
photography configuration
9
Prototyping
  • Required orientation of optical components was
    determined through experimentation
  • This data was paramount in determining the
    dimensions of the optical mounts

10
Material selection and fabrication
  • Material decision based on data collection in
    ME411
  • Engineering analysis included
  • Measuring deflection with strain gages
  • Modeling members with Abaqus, an FEA software
    program
  • A decision matrix was used to compare materials
    using the following criteria.
  • Strength
  • Weight
  • Cost
  • Manufacturability

11
Material selection and fabrication
  • Brackets were fabricated from 10 gage mild steel
  • Flat patterns were laser cut from one solid piece
  • A hydraulic break press was used to create the
    desired geometry
  • Edges were welded for structural integrity

12
Fabrication
  • Double Convex Collimating Lens Holder
  • Milled from 1 thick 6000 series aluminum using a
    CNC end mill
  • Holes drilled and tapped using an end mill
  • Orbital sander (220 grit) was used to create the
    final finish

13
Obstacles and lessons learned
  • Largest obstacle was in the ordering the
    materials.
  • Response time from manufacturer and distributor
  • Wind Tunnel delivery delayed
  • Designs were based off technical drawings
  • Changing design specifications
  • The customers priorities changed, altering the
    PDS
  • Budget constraints
  • Creative design changes were made to lower cost
    and maintain functionality detailed in the PDS.

14
Final Design
  • The final design was determined by adhering to
    the PDS and customer feedback.
  • Mounts to the legs of the wind tunnel
  • Operable by a single person.
  • Optical components can be adjusted easily to
    improve image quality

15
Questions
Photo generated during testing of Schlieren
imaging configurations
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