Chemical Source Localization Using Electronic Nose Robotics

Data Acquisition

Experimental Overview
Experimental Setup
Data Acquisition
Data Processing
Discussion and Future
About Us

The sensor responses to isopropyl alcohol were modeled based on experimentally acquired sensor voltage vs. odor placement data. A sensor array was exposed to isopropyl alcohol at various distances from either side of our sensor array and the voltage responses were recorded using a LabView graphical user interface program. Responses were recorded for distances of 10, 20, 30, 40,  and 50 cm from either side of our sensor array at sensor  heater voltages of 5 volts. 

The sensors we are working with have the optimal working voltage of 5 Volts. A fellow student who worked on this project over the summer informed us that it took about 30 minutes for the sensors to demonstrate consistent results. We decided to use temperature sensors to adapt the working algorithm to prime the sensors for data acquisition by heating the sensors at 5V before data collection, cooling them to 2V for 1 minute, then heating them again to 5V while collecting data. Between each data collection, the algorithm set the sensors to 2V for 1.5 minutes in an attempt to avoid overheating. We automated this process in LabVeiw for efficiency.

Much of the data used this semester was collected over the summer by research participant Katherine Stammer. We plan to buy new sensors at the start of next semester and recollect data using our improved data collection algorithm to verify that our processing is valid.