Biomedical Engineering Reference
In-Depth Information
Fig. 8.6
Preferred potentiostat circuit for zero bias toxic gas sensors [ 46 ]
R s ¼ V c = V RL 1
ð
Þ R L
Power dissipation across sensor electrodes (P s ) is calculated by the following
formula: (Table 8.10 )
P s ¼ ð V C V RL Þ 2
R S
The hardware of the system consists of a microcontroller and some analog
components to amplify current. Another part handles the communication with the
computer. Gas sensors can be connected to the board. Gas sensors can detect
different substances of organic vapor. Photographs of the developed hardware
prototype E-nose model are shown in Fig. 8.8 .
Software Implementation
Virtual Instrument Software Architecture (VISA) is a standard interface library
comprising RS-232 and other protocols. VISA provides the programming interface
between the hardware and development environments. LabVIEW comes with
interactive tools and configuration utilities for VISA.
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