1. Low Cost Fundus Camera P15590 October 28th, 2014
Presented by: Daniel Sui, Ian Morency, Kevin Labourdette, Kyle Burden, Thomas Casero, Quang Huynh
October 28th, 2014
Kyle

2. Overview High Risk in Optical Systems Outside Help
Alignment Designed, but needs testing
Overarching Design Improved
Microcontroller
Stepper Motors
System Power
Kyle

3. Optical Design Research - Kevin
Main Subsystem
Highest Importance
Highest Risk
Kevin

4. Subsystems - Kevin Three Main Subsystems Imaging
Create image of cornea
Create image of pupil
Adjust for magnification and focus
Illumination
IR illumination for video feed
LED flash for photos
Needs to be collimated, perfectly on axis, and adjustable
Targeting
Align pupil to imaging subsystem
Kevin

5. Imaging/Illumination Subsystems - Kevin

6. Targeting Subsystem - Tommy
Aligns Photographed Eye
Non-scanned eye
Multi-target screen
Bi convex lens
Red Illumination
Kevin/Tommy Discuss this?

7. Optical Design Risks - Ian
Reflections
Main Issue in current systems
Usually solved with pupil dilations
Donut shaped light
Scatters light out of system
Not always effective
Ian

8. Optical Design Risks - Tommy
Cost
Most likely will require multiple revisions
Need access to optical design software
Access to optical bench and opto-mechanical mounting components
Tommy

9. Meeting with Expert 1 - Kevin
Nicholas Lovullo
Optical Designer at Raytheon
U of R grad in Optical Engineering
Discussed current research via Phone
Kevin

10. Meeting with Expert 1 - Kevin
Takeaways
Will need to fully research and understand optical properties of the eye
Basic system layout is correct
Not a simple system to design
Will require a lot more than a few calculations
Kevin

11. Meeting with Expert 2 - Kevin
Josh Cobb
Senior Optical Engineer at Corning Tropel
PhD in Optical Engineering
Has experience designing an ocular fundus camera
Discussed best ways to begin optical design - in person mtg
Kevin

12. Meeting with Expert 2 - Kevin
Takeaways
The optical design is extremely complicated - even for experts in the field
Optical design and testing is impossible on current budget
We will need to copy an existing design or partner with optical engineers
Julie Bentley
Kevin

13. Meeting with Expert 3 - Tommy
Julie Bentley
Professor at U of R
PhD in Optical Engineering
Discussed possibility of partnering - in person meeting
Tommy

14. Meeting with Expert 3 - Tommy
Takeaways
Many of the same concerns including budget and complexity
Already assigned senior design projects ~3 weeks prior
Will be hard to design to only use off the shelf optics
Alternative would take years, over $50,000
Introduced us to Pedro Ramirez
Tommy

15. Meeting with Pedro Ramirez - Ian
Optical Design Student at U of R
Experience imaging retina and cornea
Retinal Topography
Corneal Aberrations
Excited to help with project
Will help create optical design
Follow up meeting with entire team - 10/30
Ian

16. Optical Design - Next Steps - Ian
Catch Pedro up on project in detail
Develop detailed list of specifications for optical system
Camera
Quality
Wavelengths
Etc
Work to receive more funding
Design Center
Client
Ian

17. Alignment System - Tommy
Internal Fixation
Eyes move in tandem
One eye focuses
Other eye is imaged
Benefits
Fewer components
Wide FOV
Tommy

18. Internal Fixation Needs - Tommy
X-axis movement
Compensate for introduced angles
Small movements needed, millimeters
Manual hand knob controls
2 Lens Sets
Larger lens that can drop away for full eye imaging
Optics set for retinal imaging
Camera is z-axis stationary
Lenses must focus and magnify in z-axis
Tommy

19. Internal Fixation Notes - Tommy
Lens/Camera
Lens must NOT be coated
No camera hot mirror
These reflect IR light
Focus
IR and natural light focus differently
Differential is well-known
Tommy

20. Overarching Design - Ian
Black Box Method
95% of people
Obesity
Large Bust
Elderly
Ian

21. Overarching Design - Ian
Easily move Camera to patient
Sedentary
Reclined
Angled
Flexible
Portable
Ian

22. Arduino Uno - Dan Rev 3 (2010) Atmel 16U2 microprocessor
14 digital I/O pins, 6 with PWM output
6 Analog Input Pins
Standard USB port
C/C++ sketch
Cost: $22.99
Arducam Shield
Model OV5642: 5MP
1080p video
Cost: $29.99 shield, $ MP camera
Dan
programmed in Java

23. Raspberry Pi - Quang Model B+ 512 MB RAM Small Computer 40 GPIO pins
4 USB ports
HDMI port
Cost: $39.95
Raspberry Pi Camera Module
5 MP
Supports 1080p video
Cost: $29.95
Quang
Programmed with python

24. Beaglebone - Kyle Beaglebone Black Rev C Pre-loaded with Debian Linux
512 MB onboard RAM
4GB of eMMC built-in storage
USB, micro-HDMI, Ethernet
two 46-pin headers
Cost: $55.00
Kyle
Can be programmed with C/C++, Python, Java, Ruby, etc...

25. Which Microcontroller? - Kyle
Raspberry Pi B+
Decent price!
Lots of I/O pins and USB ports!
Cheaper Camera Module
More options
Can test out Raspberry Pi, possibly w/ camera module, and Beaglebone in CE Labs before purchasing
Cost:
MCU - $39.95
Camera Module - $29.95
Pi TFT - $34.95
Total - $104.85
Kyle
Talked with Dr. Becker.
Also talked with Dr. Kawinski about which communication is best

26. Raspberry Pi with Touchscreen - Kyle
Adafruit PiTFT
2.8” screen
320 x 240
Cost: $34.95
Tindie PiScreen
3.5” screen - slim
480 x 320
Cost: $56.95
Kyle

27. Servo Motor - Dan Control angle/position with PWM 555 timing chip
Arduino Uno: 500 mA limit
1 degree precision
Motor torque
Size of lens
Linear precision
Tower Pro SG-5010
4.8V to 6V
5.39 N-mm
Cost: $12.00
Dan

28. Stepper Motor - Quang Small Reduction Stepper Motor 5 VDC
8 steps per rev
1/64 gear reduction
Holding torque : 15 N * mm
Additional Components
L293D - Dual H-Bridge Motor Driver
Breakout + cable
Quang
Total Cost: $13.95

29. System Power - Quang Raspberry Pi Controller Requires 5V, ~700mA
Powered from micro USB connection
Solution
Buy Micro USB power supply charger
Cost: $6.81
Camera & Motors
Powered by Raspberry Pi
Quang

30. Summary High Risk in Optical Systems Outside Help
Alignment Designed, but needs testing
Overarching Design Improved
Microcontroller
Stepper Motors
System Power
Kyle

31. Questions