Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Risk reduction test (simple proof of principle) using a light source (laser diode) and a scanner
4 sets of 5 trial measurements to establish grounds for possible systematic error of the existing device
Accomplishments from Previous Week
Risk reduction test
Identification of systematic error within the existing device
The 4 results were compared the doctor's data of 17.85 mm
Results: Consistent, but varied from person to person
Values changed when looking at different angles as well as from patient posture.
Assumptions
Real eye will be opaque
Laser beam will not be scattered
Laser Beam will cross the front most part of eye
Knowledged gained
Phototransistor or Line sensor will not meet size constraints.
Distance from to orbital bone to front of eye potentially less than 10 mm
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Final presentation on risk reduction process
PowerPoint presentation and paper works to be completed by next week
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Begin exploring other sensor options -- distance, proximity, ultrasonic sensors
Explore other medical devices such as the pupillometer
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Check wavelength spectrum; match up the light source and scanner
Try the risk reduction test with ambient light covered
Convert the risk reduction hardware test graph to “distance”
Shape of hole - switch to a slot to improve accuracy of scanner
Two groups of members: (1) Hardware; (2) Research
Research group: What types of light is safe for the eye? (visible, non-visible?)
Laser precision: How to test?
Types of sensors: Array? Spec sheet?
Look at scanners as examples
Individual component analysis
Scanners
Optical source
Eye safety
Linear slider & distance measurement
Remake the error graph
Error: from 1 mm to 0.25 mm
Sources of current error
Readings: present risk reduction results
Application: present as a future problem / concern
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
N/A
Risks and Areas of Concern
Eye safety -- classifications of laser
Size of sensors -- linear or reflective surface
All-in-one distance sensor solutions
Accuracy on lasers
Resources or Information Required but not Available
Individual component analysis is expected to be gathered about: lasers, sensors, encoders, and ultrasonic alternatives.
Schedule
More literature search
Establish an understanding of various sensors and their fundamental physics
Individual component analysis to be completed by the first week of April