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Home Sensors Gas Sensory System «Electronic Nose» Gaz -2

Gas Sensory System «Electronic Nose» Gaz -2

Description

The gas sensory system «Electronic nose» is intended for analysis of volatile organic compounds, alcoholic and nonalcoholic beverages, perfumes and toxic pollutants in the air.

The main principles of working:- array of 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-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 adsorption of analyte molecules onto sensitive surfaces of sensors frequency of quartz resonators is reducing. This frequency 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 chemical image of analyte by means of special mathematical apparatus for statistical treatment (PCA, Neural Network, etc.). After measurements working cell and sensors are cleaned with fresh dry air.

Main technical characteristics.
Number of channel –––––––––––––––––––––––– 8;
Working cell volume ––––––––––––––––––––––– 9 cm3;
Frequency drift ––––––––––––––––––––––––––– 0.5 Hz / hour;
Counter range –––––––––––––––––––––––––––– 0–16 MHz;
Resolution ––––––––––––––––––––––––––––––– 1 Hz;
Time single frequency counting –––––––––––––– 1s;
Time of measuring for recognition –––––––––––– less 5 min;
Number of recognizing chem. images ––––––––– more 10;
Range of analyte concentration –––––––––––––– 0 – 10000 ppm;
Working temperature –––––––––––––––––––––– 20 – 30 ºC;
Software –––––––––––––––––––––––––––––––– DOS, Win9X;
PC connecting –––––––––––––––––––––––––––– RS-232;
Power supply –––––––––––––––––––––––––––– 12V/0.4A.

Innovative Aspect and Main Advantages

This device has 8 sensor channels, which allow determining the соtents of some pollutants simultaneously. The time of one-fold measuring is 1 sec and the resolving power is 1 Hz.

Areas of Application

Рerfumery, food industry (estimating of freshness of meat, fish, fruits, and correspondence to etalon of coffee, vodka, brandy, beer), health services (monitoring of environment), customer service and criminalistics.


Fig. 1 Electronic nose “GAZ-2”

Stage of Development

Prototype developed and tested

Contact Details

І.А. Koshets, Z.I. Kazantseva
V. Lashkaryov Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine
41 Nauki Prospect, 03028 Kyiv, Ukraine
Tel./Fax: (+38 044) 525 9798
Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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