Justin Horrell s.pptx

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ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators

Topic: Breathalyzers (Breath Alcohol Content

Sensors)

Prepared by: Justin Horrell

Dept. of Electrical and Computer Engineering

Utah State University

E: [email protected];

3/11/2010


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11/12/2014 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

Slide-2

Outline

Reference list Major applications

Basic working principle

Law enforcement application

Major specifications

Electrochemical fuel cell specifications

Limitations

Choosing a breathalyzer Cost information and variability

Models, cost and where to purchase


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Slide-3

Reference List

http://www.pololu.com http://www.intox.com/

http://www.breathalyzer.net

http://www.bactrack.com

http://www.amazon.com

http://www.fuelcell-sensors.com


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Slide-4

Further Reference

http://www.futurlec.com/Gas_Sensors.shtml

http://www.fctec.com/fctec_basics.asp

http://www.pololu.com/file/download/MQ3.pdf?file_id=0J310

http://en.wikipedia.org/wiki/Electrochemical_cell

http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/electrochem.html


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Slide-5

Major Applications

Principle technology to measure similar gasses,not just alcohol. Major applications of gas

sensors are:

Law enforcement (alcohol)Mining safety (methane)

CO detection

Air quality controlHospitals


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Basic Working Principle

Chemical reaction causing color changeBreath is exhaled by the subject into the device

Alcohol is converted to liquid form by sulfuric acid

Mixture reacts with potassium dichromate to producea color proportional to the alcohol content

Photocells convert the color difference from reacted

mixture to an un-reacted sample to electrical current

Electrical current is converted to a digital display


Slide-7


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Infrared SpectroscopyUsed to identify various compounds within a sample

Molecules are identified based on IR interaction

Breath is exhaled into an laser tubeIR light is sent through the exhaled air

Optical band-pass filter is used to identify ethanol

Electrical current determines alcohol content based onthe signal amplitude from the filter


Slide-8


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Electro-chemical AnalysisBreath is exhaled onto a fuel cell

Cell consists of two platinum leads with a porous

layer betweenConverts alcohol to acid

Creates free electrons

Free electrons are directlyproportional to breath alcohol

content.


Slide-9

http://www.intox.com/images/FC_Schematic.gif


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Law Enforcement Application

Purposes for breathalyzer tests in lawenforcement:

Local, state and highway police department road-side

DUI determination and arrestJails and prisons for testing on inmates

Probation officers to ensure offenders are keeping to

the terms of their probation

Work release programs within the prison system


Slide-10


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Law Enforcement Application

Todays technology relies mostly on Electro-chemical Analysis using fuel cells.

Pros:

Specifically calibrated for human breathEasy to maintain consistent measurement

Linear response

Low power consumption Con:

Limited sample amount unable to account for variance


Slide-11


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Major Specifications

We will explore theBACtrack S80 ProBreathalyzer

Commonly used in Law Enforcement

Quick response timeAccurate with even trace amounts of alcohol

0.0020.4 % Accuracy range (This is virtually the range

from complete sobriety and death)

Accurate with even trace amounts of alcohol

Linear response

Durable and long lasting


Slide-12


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Major Specifications

Specifications of theBACtrack S80 Pro:

Requires Calibration

Runs on two AAbatteries.


Slide-13

http://lib.store.yahoo.net/lib/breathalyzer-net/bactrack-s80-ownersmanual-5.pdf


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Electrochemical Fuel Cell

BACtrack S80 Pro utilizes electrochemical fuelcell sensor technology as this figure shows


Slide-14

http://chemelab.ucsd.edu/fuel04/0b86c2e0.png


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Electrochemical Fuel Cell


Slide-15

The correlation precision of the Peak Output atincreasing gas concentrations:

http://www.fuelcell-sensors.com/technology.html


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Limitations

Inaccurate readings following eating, drinking orsmoking within 20 minutes of using the device

Accurate temperature range is 0-40 C

Requires calibration every 6-12 months

Requires at least 5 seconds of air flow to ensure

accuracy


Slide-16


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Choosing a breathalyzer

Determination of which breathalyzer is right foryou depends on your application.

Professional such as law enforcement or hospitals

should choose a breathalyzer which isAccurate

Large range of accuracy

Electrochemical fuel cell fits these requirements Personal use must consider cost, and may choose

a less accurate device


Slide-17


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Acquiring a Breathalyzer

We will now go over several different deviceswhich are available for purchase

Consider cost and availability

Determine how much accuracy you need versuscost

Finally we will explore where to purchase a

device


Slide-18


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BACtrack S80 Pro

Accurate Small size

Wide range

Low power

0.000.40 % BAC

Consumer: $200

May purchase from the manufacturer:

http://www.breathalyzer.net/bactrack-select-s80.html


Slide-20

http://lib.store.yahoo.net/lib/breathalyzer-net/S80-box-kit.jpg

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