biosensor presentation faculty
Transcript of biosensor presentation faculty
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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
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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
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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
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WHAT IS A BIOSENSOR?
Device for sensing chemical
and biological material
Our goals:
Point of care
Rapid analysis
Multiplexible
Portable
Cost effective
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STRUCTURE OF A BIOSENSOR
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THREE LASER DESIGN
λ3
780 nm
CMOS
Camera
Optical Cavity
Sensing Layer
Δd
λ1
830 nm
λ2
850 nm
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TRAINING
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SOFTWARE/PROGRAMS THAT I HAVE USED
FOR RESEARCH
Project Forum
SolidWorks
IGOR Pro
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PROJECT FORUM
• Used to keep up with
work
• Allowed other team
members to view
progress
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SOLIDWORKS
• Used to create 3D models that
could be printed quickly for use
in the prototype
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SOLIDWORKS FILTER DESIGN
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IGOR PRO
• Takes in data
collected from
spectrometer or
CMOS camera
and turns data
into graphs
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THE LAB
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INSIDE THE LAB
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FABRICATION
PROCESS
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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.
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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
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WHAT IS AN OPTICAL SPECTROMETER?
(ROBIN KIM)
Takes light and breaks it down into spectral components
Allows us to test stability of laser diodes
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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
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WHAT IS A CMOS CAMERA?
(CYDNIE ROBISON)
CMOS – Complimentary metal oxide
semiconductor
The CMOS camera calculates the change in the
laser’s light.
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THE CMOS CAMERA
• Showed the
benefits and
shortcomings
of CMOS and
made CCD an
option
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SETUP
Spectrometer
Exposure time: 0.1
ms
780nm, 830nm,
850nm laser diodes
on
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LASER DIODE STABILITY TEST
Test the stability of the laser diodes over time
Measures absolute irradiance and wavelength of laser
diodes
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DATA PROCESSING
Used Igor to attain information about the laser diodes based on the light
collected by the spectrometer.
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DATA PROCESSING: WAVELENGTH AND
MAXIMUM ABSOLUTE IRRADIANCE
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DATA PROCESSING: SUM OF IRRADIANCES
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DATA PROCESSING: FULL WIDTH AT HALF
MAXIMUM
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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.
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LASER DIODE STABILITY TEST RESULT II
As maximum absolute irradiance increases, FWHM
decreases.
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LASER DIODE STABILITY TEST RESULT III
Wavelengths of lasers are not 780nm, 830nm, 850nm but are
rather 785nm, 832nm, and 863nm, respectively.
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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
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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