Artificial Perceptual Sensors - Artificial Human Sensors: Science and Applications - page 139

voltammetry. This technique uses a potential that is applied between two or more
electrodes and the resulting current magnitude is measured. An electrochemical
redox reaction occurs at the contact surface of the electrodes and makes the current
individually-based measurements on the respective properties of the liquid. More
accurately, all molecules in the proximity of the measured liquid that are electro-
chemically active below the applied voltage will contribute to the redox response,
Lindquist (2007).
The drinking water sensor system in the figure above is in a natural commer-
cialisation phase of the developed technique. The system will communicate a light
indication depending on the tested water sample, indicating whether it is safe to
drink the water and before an intake of the liquid into the mouth. The application
is demonstrated in a prototype, as shown in Fig. 6.7. The system approach exhibits
an external test, while the person is filling the glass and in the meantime evalu-
ates the liquid at a proximity outside the body. Various tests have been performed,
with a focus towards the quality assessments of drinking water and applications
from the source to a person's intake of the liquid, Scozzari (2008).
The operational strategy of an electronic tongue approach can be viewed in
the following structure when building a base concept. In the concept below, the
technique of an electronic tongue uses voltammetry and the adaptation is focussed
on applications of sensing water quality, e.g., in measuring wastewater in a wash-
ing machine, Olsson (2008). Of course the fine-tuning of the type, range and selec-
Figure 6.7. An example of a conceivable design of an water test. A green light is shown on
the joint of the testing unit, indicating no changes in the water quality. Photo courtesy and
copyright Peter Wide c 2010.