ELECTRONIC NOSE ““GAZ(cid:2)(cid:2)22â€â€
APPLIEDRESEARCH • SENSORSDescription
Array of eight quartz crystal resonators are covered with films
of various organic sorptive materials (calixarenes, polymers)
which have different sensitivity towards different volatile
organic molecules analyzed. This device belongs to non(cid:2)flow
type, i.e. after injection of analyte vapor working cell is cut off
and no flow of analyte occurs under measuring stage. Due to
absorption of analyte molecules onto sensitive surfaces of
sensors frequency of quartz resonators is reducing. This fre(cid:2)
quency shift is considered as a sensor response. Obtained
array of sensors responses to pulse of analyte vapor is used
for “teaching†system and after that – for recognition of chem(cid:2)
ical image of analyte by means of special mathematical appa(cid:2)
ratus for statistical treatment (PCA, Neural Network, etc.).
After measurements working cell and sensors are cleaned
with fresh dry air.
Innovative Aspect and Main Advantages
This device has 8 sensor channels, which allow determining
the Ñоtents of some pollutants simultaneously. The time of
one(cid:2)fold measuring is 1 sec and the resolving power is 1 Hz.
Areas ooff Application
“GAZ(cid:2)2†can be used for environment monitoring to detect
hazard pollutants in air, in agriculture and food industry for
testing quality and freshness of fruits, meat, fish and other
products. Especially great attention can be paid from per(cid:2)
fumes producers and producers of beverages (brandy, vodka,
beer, coffee). Another possible area of application is criminal(cid:2)
istics and customer service for detection of drugs, explosive
materials, etc.
Fig.1. Electronic nose “GAZ(cid:2)2â€
Stage ooff Development
Prototype developed and tested
Contact Details
Oleksandr Belyaev
V. Lashkaryov Institute of Semiconductor Physics of the
National Academy of Sciences of Ukraine
41 Nauki Prospect, 03028 Kyiv, Ukraine
Tel.: +(380(cid:2)44) 525(cid:2)40(cid:2)20
Fax: +(380(cid:2)44) 525(cid:2)24(cid:2)47
Email: belyaev@isp.kiev.ua
Website: http://www.isp.kiev.ua
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