Project O.N.O.S.E. Optical Noxious Odor Sensing Electronics Capstone Preliminary Design Review Fall 2003

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Project O.N.O.S.E.Optical Noxious Odor Sensing
ElectronicsCapstone Preliminary Design
ReviewFall 2003
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Overview

• Jennifer Sweezey
• Project Introduction
• Proposed Objective
• Andy White
• Existing Hardware
• Chris Bauer
• Approach outline
• Sub-systems

• Diane Cyr
• Schedule
• Risks contingencies
• Anubhav Bhatia
• Upgrades
• Economics

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ObjectiveDesign and implement a processor,
along with all additional necessary components,
to interface with an existing optical nose
instrument. This includes modules to control the
device, collect and analyze data, and provide a
human usable interface.
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Purpose

• Provide the existing optical nose instrument with
  a more versatile/complete control and interface
  system
• Allow a user to accurately detect the presence
  and concentration of a chemical vapor
• Provide a useful tool for a wide range of
  applications, such as military operations,
  homeland security, perfume testing, etc.

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Baseline Objectives

• To be able to detect one smell very well.
• To take a known volume of air and detect if the
  chemical exists.
• Calculate how many parts/million of the chemical
  is in the air.
• Display concentration on an LCD as a number.

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Existing Instrument Hardware
Large prototype version includes the optics
shown here, a function generator for vapor input
switching, a phase-lock loop system for
synchronization purposes, and a compressed air
vapor input system
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Portable Version

• About the size of a small flashlight
• Small manual pump used to input vapor
• All optics/electronics contained inside and run
  off of a battery
• Something of about this size is the ultimate goal
  for our interface

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Basic Instrument Functionality
 
INPUT vapor input switched between reference
gas (air) and sample gas to simulate sniffing
Polymer reacts to the presence/concentration of
different vapors by changing its physical shape.
Affects the reflection of the beam into the rest
of the system.
OUTPUT intensity signal (or CCD image for
polymer array). This signal/image will be
recorded and fit to some calibration curve to
determine vapor concentration in PPM or PPB
Crystal Holography dynamically adapts to create
a pi phase-difference between the reference beam
and the polymer- altered beam. This basically
creates constructive or destructive interference,
which can produce different light intensities.
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Black Box View
We will basically need to provide a sniff control
subsystem, an intensity data collector/analyzer,
and a phase-lock loop for synchronization between
the sniff control and the output signal.
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Approach Outline
Key Pad
Sniff Control
Our Circuit
Optical Sniffer
LCD Screen
Switch Odor
Intensity
Transducer/CCD
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Sub-System Layout
Key Pad
Motorola 68000
Xilinx FPGA
Sniff Control
Digital Switch
LCD Screen
Serial Port
3.2V Power
RAM
Switch Odor
D/A
5V Power
A/D
ROM
Intensity
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Schedule
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Risks and Contingency Plan

• Risk 2 Connect it
• Assumptions
• User friendly vs. connecting

X1X
XX2XX

• Risk 1 Design
• Customer wants vs. needs
• Size vs. performance

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More Risks

• Risk 4 Battery Power
• Battery vs. outlet

X3X

• Risk 3 Feedback
• Known PPM

X4X
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Future Upgrades

• Wireless Link
• Makes use of a one way transmitter and receiver
  to send output data to a remote location
• Rover Mount
• Would allow the O.N.O.S.E. to be mounted on a RC
  rover, to send the system into possible hazardous
  locations and get the readout remotely

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Future Upgrades Continued

• Capability to detect multiple scents
• Exchanging single polymer disks
• Implementing multiple polymer arrays on a single
  disk

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Economics
Component Estimated Cost
Processor 10.00
FPGA 30.00
A/D, D/A 20.00
LCD 10.00
Wirewrap Board 40.00
Wires/caps/resistors 5.00
Power Supply 5.00
Power Converters 5.00
Serial Port 5.00
Digital Switch 2.00
RAM/ROM 10.00
Miscellaneous 20.00
Total 162.00
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ROI/Impact on Society

• Due to the numerous applications and uniqueness
  of the system, there is a large market share.
• Assuming one could be sold for 200.00, the ROI
  would be at least 50.
• Society benefits from the possible increase in
  security, health benefits, and environmental
  safety.

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Sustainability

• The processor unit is very sustainable
• Parts are inexpensive and widely available.
• The optical unit is more delicate and may require
  more expertise to maintain.
• Optic system requires precise adjustment.
• Laser and lenses are more expensive.
• Transducers must be custom made.

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Questions?

• Jennifer Sweezey
• Project Introduction
• Proposed Objective
• Andy White
• Existing Hardware
• Chris Bauer
• Approach outline
• Sub-systems

• Diane Cyr
• Schedule
• Risks contingencies
• Anubhav Bhatia
• Upgrades
• Economics