Project O.N.O.S.E.Optical Noxious Odor Sensing Electronics

Capstone Preliminary Design ReviewFall 2003

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

Objective:

Design 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.

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.

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.

Existing Instrument HardwareLarge 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

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

Basic Instrument Functionality

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.

LaserBeam Conditioning 

Photo-diode or CCD camera

INPUT: vapor input switched between reference gas (air) and sample gas to simulate sniffing

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.

 

Black Box View

Sniff Control

Intensity Data

Phase-Lock Loop Synchronization

Existing Hardware

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.

Approach Outline

Key Pad

Our CircuitOptical Sniffer

Transducer/CCD

LCD Screen

Sniff Control

Switch Odor

Inte

nsity

Sub-System Layout

Motorola 68000Xilinx FPGA

A/D

Inte

nsity

Switch Odor

Sniff Control

Key P

ad

LCD Screen

D/A RAM

ROM

DigitalSwitch

3.2VPower

5VPower

SerialPort

ScheduleEvents September October November December

PDR PDR

design

bui ld i t

CDR CDR

Connect i t

Feedback

I Milestone I

battery

LCD

Input

I I Milestone I I

Technical Referance Manual

Expo Expo

User 's Manual

Events September October November December

PDR PDR

design

bui ld i t

CDR CDR

Connect i t

Feedback

I Milestone I

battery

LCD

Input

I I Milestone I I

Technical Referance Manual

Expo Expo

User 's Manual

Risks and Contingency Plan

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

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

X1X

XX2XX

Events September October November December

PDR PDR

design

bui ld i t

CDR CDR

Connect i t

Feedback

I Milestone I

battery

LCD

Input

I I Milestone I I

Technical Referance Manual

Expo Expo

User 's Manual

More Risks

Risk 4: Battery Power•Battery vs. outlet

X4X

X3XRisk 3: Feedback•Known PPM

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

Future Upgrades Continued

• Capability to detect multiple scents– Exchanging single polymer ‘disks’– Implementing multiple polymer arrays on a

single disk

EconomicsComponent 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

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.

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.

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