heal.abstract |
The present dissertation aims at the design and construction of the electronic measurement
system in the context of experimental application of nanoparticle infused sensors with variable
resistance. Humidity sensors as well as common resistors are used as a case study. System
design includes troubleshooting the original microcontroller software and adding new features.
Then it involves the design of a printed circuit board based on a previous circuit that had been
implemented tentatively, in order to be easy to interface with the microcontroller. In addition,
the data acquisition software was developed via the aid of the python programming language,
in order to control the Arduino platform, and finally, to successfully take measurements.
The measurements carried out with the system constructed in the present work took place in
the laboratory of Electronic Nanomaterials and Devices of the National Technical University
of Athens. The measurement device included electrochemical sensors of polyimide substrate
coated with PIBMA polymer. The experimental design consists of tests of different humidity
percentages and different standard resistances.
The results of the measurements with the given system are plotted as a function of time. The
fact that, compared with the results of similar measurements of the Keithley 2400 commercial
system, there is no significant deviation in the extremes of the measurements is of particular
interest. This finding is important, as the cost of the commercial system is about two orders of
magnitude higher than our system. However, our results have more intense presence of noise,
in the case of measuring resistances outside the range of our system. Nevertheless, the system
we have developed is more flexible, as it is portable and can be modified with a variety of
options.
The results of this project can lay the foundation for the creation of a low cost and high
adaptability platform, which can be implemented in a short time, potentially autonomous and
in areas with no option of using laboratory equipment, for all sensors of variable resistance. |
el |