Download - biosensor presentation faculty
OUTLINE• Introduction
• The Team
• What is a biosensor?
• Structure of a Biosensor
• Our Design
• Training• Software/Programs
• The Lab
• Research• Laser Diodes
• Spectrometer
• CMOS Camera
• Testing and Conclusions• Laser Diode Stability Test
• Contributions and Experience
THE TEAM: SUPERVISOR AND
GRADUATE STUDENTS
Supervisor: Dr. Seung Kim
Assistant Professor of Electrical
Engineering since 2010
Senior researcher at BYU from
2004-2010
Ph.D., University of Alabama,
Huntsville, 2004
B.S., University of Suwon, Korea,
1998
Graduate Students: SaiHim Cho
Electrical Engineering
Cody Joy
Electrical Engineering
Undergraduates:Rebekah CushmanComputer Engineering
Gino ChaconComputer Engineering
Jonathan HerbertElectrical Engineering
High School Students:Robin Kim:Spring Hill HS
Katy O’Quinn:Hallsville HS
Cydnie Robison: Longview HS
THE TEAM: UNDERGRADUATE AND HIGH
SCHOOL STUDENTS
WHAT IS A BIOSENSOR?
Device for sensing chemical
and biological material
Our goals:
Point of care
Rapid analysis
Multiplexible
Portable
Cost effective
STRUCTURE OF A BIOSENSOR
THREE LASER DESIGN
λ3
780 nm
CMOS
Camera
Optical Cavity
Sensing Layer
Δd
λ1
830 nm
λ2
850 nm
TRAINING
SOFTWARE/PROGRAMS THAT I HAVE USED
FOR RESEARCH
Project Forum
SolidWorks
IGOR Pro
PROJECT FORUM
• Used to keep up with
work
• Allowed other team
members to view
progress
SOLIDWORKS
• Used to create 3D models that
could be printed quickly for use
in the prototype
SOLIDWORKS FILTER DESIGN
IGOR PRO
• Takes in data
collected from
spectrometer or
CMOS camera
and turns data
into graphs
THE LAB
INSIDE THE LAB
FABRICATION
PROCESS
WHAT IS A LASER DIODE?
(KATY O’QUINN)
A laser diode is a component that
converts an electrical signal into a
corresponding light signal.
The most common type of laser diode
is a semiconductor laser diode.
LASER DIODES
A laser diode is a small inexpensive way of producing light
Discovered possibility of monitoring using photodiode
Gained better understanding of laser diodes
WHAT IS AN OPTICAL SPECTROMETER?
(ROBIN KIM)
Takes light and breaks it down into spectral components
Allows us to test stability of laser diodes
SPECTROMETER
• Discussed the
function of the
spectrometer, the
physical principles
behind it, and graphs
produced by
spectrometer
• Gave basic
knowledge in order to
do spectrometer tests
WHAT IS A CMOS CAMERA?
(CYDNIE ROBISON)
CMOS – Complimentary metal oxide
semiconductor
The CMOS camera calculates the change in the
laser’s light.
THE CMOS CAMERA
• Showed the
benefits and
shortcomings
of CMOS and
made CCD an
option
SETUP
Spectrometer
Exposure time: 0.1
ms
780nm, 830nm,
850nm laser diodes
on
LASER DIODE STABILITY TEST
Test the stability of the laser diodes over time
Measures absolute irradiance and wavelength of laser
diodes
DATA PROCESSING
Used Igor to attain information about the laser diodes based on the light
collected by the spectrometer.
DATA PROCESSING: WAVELENGTH AND
MAXIMUM ABSOLUTE IRRADIANCE
DATA PROCESSING: SUM OF IRRADIANCES
DATA PROCESSING: FULL WIDTH AT HALF
MAXIMUM
LASER DIODE STABILITY TEST RESULT I
The spectrometer test that used laser diodes with higher power
showed that the total maximum irradiance was more stable than
when the lasers had less power.
LASER DIODE STABILITY TEST RESULT II
As maximum absolute irradiance increases, FWHM
decreases.
LASER DIODE STABILITY TEST RESULT III
Wavelengths of lasers are not 780nm, 830nm, 850nm but are
rather 785nm, 832nm, and 863nm, respectively.
MY MAIN CONTRIBUTIONS TO THE BIOSENSOR
RESEARCH TEAM DURING THIS SUMMER 2014
Individual Research
- Optical Spectrometer
High School Students’ Research
-Laser Diode Stability Test Analysis
WHAT I HAVE LEARNED THROUGH THE BIOSENSOR
RESEARCH SUMMER PROGRAM AT LETOURNEAU
• Experienced the research environment
• Learned how to work as team
• Learned how to think like an engineer
• Learned how to use different software and programs
• Inspired me to major in electrical engineering