Artificial Perceptual Sensors - Artificial Human Sensors: Science and Applications - page 141

The verification phase is important to establish a “belief” in the system,
actually that it behaves as expected. To verify the properties of a perceptual sit-
uation, can with advantage, be measured and verified by another perceptual sys-
tem. An interesting emerging technology has been demonstrated by the advantage
of combining two (or more) sensing techniques measuring a combined behaviour
from one property into the detection and identification of the other sensing sys-
tem. The “system measuring system” concept is often a way of visually monitor-
ing the result from other perceptual systems. This methodology may be a useful
approach, also to validate human-based systems and conduct performance exper-
iments. The optical gas imaging technique gives an illustrative concept. This per-
spective describes an excellent mean to visualise the resulting measurement values
from an olfaction system by an output imaging “picture”. This approach indeed
provides a more human friendly and communicative process to a person and an
understanding of the result. An artificial 'olfactory' image from a chemical sensor
is presented (vision-measuring-olfaction) in Lundstrom (1991).
Another variant of the combined measuring system concept can be an efficient
and forward moving principle, without measuring with a gas system that may
indicate a leakage as illustrated in Fig. 6.8. Instead, the leakage substances can di-
rectly be identified by optical imaging the leakage. Gas leaking from a production
plant or in transportation is a complex and undesirable situation that may end-up
in a catastrophe for both people and material. The technique to measure possi-
ble gas leakage by an optical gas imaging device, has been proposed by Sandsten
(2004). The gas leakage can be detected and identified by an optical camera system
and exhibit the imaging by gas measurement principle. A leakage at an industrial

Figure 6.8. The optical gas imaging illustrates a gas leakage accident from a tank truck.