Chemical Source Localization Using Electronic Nose Robotics

Experimental Setup

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

The odor sample used was isopropyl-alcohol. We filled the bottle cap with the liquid and placed it at various distances from the chemical sensor array. We did this placing the cap below the bottom sensors and above the top sensor so that we could observe the peak and valley delays within pairs of sensors mimicking when the odor sense is either to the right or to the left of the "nose." The photos below show the experimental setup.
Chemical Sensors:

hree different types of sensors manufactured by Figaro Engineering Inc. were used. We placed these sensors in a 2x3 array,  with the columns being composed of pairs of the same type of sensor.  Each of the columns represents an "electronic nose." The sensing element is composed of a metal oxide semiconductor layer on an aluminum substrate of a sensing chip with an integrated heater. Sensors operate maximally when heated at 5V.  When there is a detectable gas or odor, the conductivity of the sensor changes.  This change in conductivity is processed by the external circuitry in to a voltage. A sensor and its circuitry are shown below.