E Nose and E - Tonguecourses.daiict.ac.in/.../content/0/F_E-Nose_E-Tongue.pdfE –Nose Where do we use this? Food Industry, Space crafts, Environment Monitoring, Medicine Where did

E – Nose and E - Tongue

• Sai Dheeraj Polagani

(200701127)

• Radhakrishan Sripada

(200701153)

ESP Presentation

17th April , 2010

Contents

Introduction

E – Nose

E – Tongue

Conclusion

17/04/2010 2/25ESP Presentation

Electronic Nose


E – Nose

Where do we use this? Food Industry, Space crafts, Environment Monitoring, Medicine

Where did this originate? Artificial Neural Networks(started in 1982). Currently major contributions from NASA.

What is being measured?

Materials Used Tin-oxide sensors (Taguchi-type gas sensors)



All of the polymer films on a set of electrodes (sensors) start out at a measured resistance, their baseline resistance. If there has

been no change in the composition of the air, the films stay at the baseline resistance and the percent change is zero

e- e- e- e- e- e-

BASELINE RESISTANCE


If a different compound had caused the air to change, the pattern of the polymer films' change would have been different:

Each polymer changes its size, and therefore its resistance, by a different amount, making a pattern of the change

THE ELECTRONIC NOSE SMELLS SOMETHING

e- e- e-

e- e-e-

e-

e-

e-

e-e-

e-

E – Nose

Sample delivery system

Detection system

Computing system

The more commonly used sensors include metal oxide semiconductors (MOS), conducting polymers (CP), quartz crystal microbalance, surface acoustic wave (SAW), and field effect transistors (MOSFET).

In recent years, other types of electronic noses have been developed that utilize mass spectrometry or ultra fast gas chromatography as a detection system.


Electronic Tongue


Contents

Yummy !


Contents


Six Basic Tastes

• Sweet• Salt• Hot• Bitter• Sour• Tang

Contents

Introduction

E – Nose

E – Tongue

Conclusion



Sensor: Taste Buds

uController: Brain

Actuators: Hands ?

What is Electronic Tongue


Introduction

E – Nose

E – Tongue

Conclusion


-Astree Electronic Tongue

Developed Alpha MOS headquartered in Toulouse, France.

An array of 7 electrochemical sensors and 1 reference electrode.

An electronic unit for auto-sampler control.

Software.


how E-Tongue works…

Each sensor has a different organic coating, which reacts withthe test compound and generates different potentials relative tothe reference electrode (Ag/AgCl).

The potentiometric difference between sensors produces themeasurement output.

Quantification is based on the combined response acrosssensors thought to be related to the test compound’s chemicalproperties.


Advanced E-Tongue*

Jet Propulsion Laboratory, California Institute of Technology

25-cm3 electrochemical cell developed for the MECA (Mars Environmental Compatibility Assessment) project, which included 20 prefabricated Ion Selective Electrodes, a conductivity sensor, a temperature sensor and an oxidation reduction potential sensor

Development of a water quality sensor for use on the International Space Station Alpha.


*Published in 2002 IEEE Aerospace Conference, 2002


• Working Electrodes (WE) and Reference Electrodes (RE) –Pd(12%)Ag(88%) and the second type with Au.

• Substrate - 1mm thick 96%-pure alumina.

• Auxiliary Electrodes (AE) -Au/Ni plated Cu.

Genetic Algorithm (GA) that has two purposes:

(1) to optimize the pattern matching algorithm based on chemometric techniques and

(2) to design and select the optimal experimental parametersthat control the conditions in the sample chamber

We hope to be able to discriminate between contaminates in thewater and increase the apparent sensitivity of the sensors


On going research…University of Texas

Microbeads arrayed on asilicon chip.

Each of the beads is able torespond to different analytessimilar to that of the humantongue.

Arranged beads, in tiny pitswhich are marked with dye tocreate a red, green, and blue(RGB) color bar.

Help of computer processors itthen distinguishes the tastepresent by performing simpleRGB analysis.


On going research…

St. Petersburg University

Dr. Andrey Legin and his group are working at the ‘Laboratory ofChemical Sensors’ of St. Petersburg University for thedevelopment of new sensor arrays for solution analysis.

They are trying to use potentiometric chemical sensors forsolution analysis rather than the earlier available sensors(conventionally called ion-selective electrodes) for solutionanalysis

Ohio State University

Sheikh A. Akbar and group at Centre for Industrial Sensors andMeasurement, Ohio State University are working towards thedevelopment of sensors for an Electronic Tongue.


Applications

The E-tongue is useful for a wide variety of industries rangingfrom environmental control to blood analysis.

In Food and beverage Industry, it can be employed for Foodquality control during processing, Control of ageing process ofcheese, whiskey and Automatic control of taste.

In Pharmaceuticals, since you can’t legally have people sittingaround all day tasting drugs that are still in the developmentalstages, electronic tongues are the perfect solution to test thepalatability of various coatings for tablets or other oral deliveryforms.

The E-tongue in combination with the E-nose will somedaysolve much safety, economic, and maintenance Problems.


References

http://science.nasa.gov/science-news/science-at-nasa/2004/06oct_enose/

A standalone neural network based electronic nose

Hines, E.L.; Gardner, J.W.; Stansfield, R.N.; DSP (Digital Signal Processing) in Instrumentation, IEE Colloquium on (Digest No.009) Publication Year: 1992 , Page(s): 10/1 - 10/4

Electronic noses and their applications

Keller, P. E.; Northcon 95. I EEE Technical Applications Conference and Workshops Northcon95 Digital Object Identifier: 10.1109/NORTHC.1995.485024 Publication Year: 1995


References

An Application of Serially Balanced Designs for the Study of Taste Samples with the α-ASTREEElectronic Tongue - Stan Altan, Marc Francois, Sabine Inghelbrecht, Areti Manola, Yan Shen Raritan,NJ, USA & Beerse, Belgium.

Presentation by Yan Shen from Johnson and Johnson Pharmaceutical Research and Development at2006 International Conference on Design of Experiments and Its Applications, Nankai University,China.

Advanced Electronic Tongue Concept By Martin G. Buehler, Gregory M. Kuhlman, and DidierKeymeulen Jet Propulsion Laboratory, California Institute of Technology And Samuel P. Kounaves,Department of Chemistry. Tufts University

Published in 2002 IEEE Aerospace Conference, 2002

The Electronic Tongue, ELE 382: Seminar 2 By: Nick Samos, University of Texas.

Research work at Laboratory of Chemical Sensors of St. Petersburg University

(http://www.electronictongue.com/ )

Electronic Noses and Tongues b y L i n d a L . L e a k e , Michigan State University

( http://www.alpha-mos.com/resources/pdf/articles/Alpha-MOS_Articles_0606_Food_Technology.pdf)


Thank You !


Documents

E Nose and E - Tonguecourses.daiict.ac.in/.../content/0/F_E-Nose_E-Tongue.pdfE –Nose Where do we use this? Food Industry, Space crafts, Environment Monitoring, Medicine Where did