Field-test results with representative scatter patterns and classification accuracy. (a) The portable scatterometer was installed in a vehicle and operated via an UPS; only three different organisms were tested owing to safety regulation. The scans were performed in four different locations with their GPS position recorded and the reference database was accessed using a commercial cellular network. (b) Comparison between the reference and portable scatterometer.. Circles denote the features extracted from database constructed with reference scatterometer system (red-E.coli, blue-L. innocua, green-E.facium, and gray-S.aureus) while squares represents the features from the field test of the portable detector.