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Sensor arrays

Sensor responses in a single component medium are shown in Fig.2 and Fig. 3. They illustrate the sensitivity of different types of non-specific chemical sensors to inorganic and organic substances. The sensor responses of carefully developed and selected materials can be very reproducible (typically + 1-3 mV, while the scale of measured effects is often 20, 50 even 100 mV and more) and really long lasting (typical life time for a solid sensor is several years, of an organic polymer one - up to 1 year). Such sensors are put together in sensor sets combining up to 10-40 different sensors.

Sensor responce Sensor responce

In the multi component media (e.g. many food stuffs and beverages) the response of such sensors comprised into an array is usually not linear any more, but it is still reproducible and the differences between samples are usually very significant.
Sensor array of the electronic tongue mainly consists of two types of sensors - chalcogenide glass ones and polymer-based sensors.
The system architecture is intrinsically open, thus other sensors and sensor devices can be incorporated and even other methods can be put together with the electronic tongue to produce wider complementary information about an analyte.

| Idea | Electronic tongue | Sensors arrays | Data processing | Experimental set-up |