Use of specific in-situ sensors : enose

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Use of specific in-situ sensors:

E-Nose

A-C Romain

(2)

OMNISCIENTIS (308427)

E-nose: a bioinspired instrument ?

y

Analogy with the biological system:

y

E-nose = instrument with several potentials but with

performances far behind the human olfactory system

Intensity Hedonic tone Character Olfactory receptors Chemical sensors signal processing Odour perception Chemical info Chemical concentration Composition

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Instrument

y

Definition

“instrument which comprises an

array

of

chemical sensors

with partial specificity and

an appropriate

pattern recognition system

, capable of recognizing simple or complex odours”

[Gardner and Bartlett, 1993]

y

Chemical sensors

a small element that transforms chemical information into an electrical signal X +S XS X Time ΔΚ_ij Electrical signal S

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Concept

Combination of all the signals

PATTERN RECOGNITION SYSTEM

(PARC

)

(data treatment)

Signal of each sensor

(Δk_ij)

Sensors array

(i)

Pattern

Cheese ?

Chemical sensors

1 2 3 4 5 6

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Data treatment

y

Identification

Pulp and paper plant

Landfill

Farm Learning of the model

Use of the model to identify the pattern

many samples of the same source

in different conditions

y

Relationships between the “pattern” and the input (gaseous

mixture): Multivariate analyses (mathematical and statistical

models)

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Data treatment

y

Quantification

y

Relationships between the “pattern” and the input (gaseous

mixture): Multivariate analyses (mathematical and statistical

models)

Calibration (Learning)

many samples of the same source

in different concentrations

Landfill odour : various concentrations

534 ou 7354 ou 110 ou - chemical analysis (mg/m³) - sensorial analysis (odour unit)

0 500 1000 1500 2000 2500 3000 0 100 200 300 400 500 600

Combinaison linéaire des capteurs

C oncen tr at io n de l 'odeur d e c o m p os t (u o /m 3)

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OMNISCIENTIS (308427)

In Situ application: odour monitoring

Landfill

E-nose Computer E-nose network control internet

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(308427)

Landfill

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OMNISCIENTIS (308427) 6 TGS (Figaro®_{) sensors} TGS822, TGS842, TGS880, TGS2610, TGS2620 and TGS2180

+ temperature and humidity.

Continuous measurement of sensor conductance (no cycling air/sample)

Simple box, easily accessible for

maintenance

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Footer Text

Graphical User interface (LabWindows®_{) – User-friendly}

Showing the 5 dimensions of the FIDOR concept of annoyance

Frequency and Duration of odour events

Intensity (odour "level")

Offensiveness = odour source (compost, biodrying,

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Thanks for your attention

Environmental monitoring group

Department of environmental sciences and management Faculty of Sciences Arlon (Belgium) 063/23.08.59 acromain@ulg.ac.be www.campusarlon.ulg.ac.be/

Use of specific in-situ sensors : enose