Feasibility Study of a Non-Contact Differentiation of Cannabidiol Concentrations Using Interdigital Electrodes

Abstract This feasibility study presents a novel noncontact method for differentiating standard cannabidiol (CBD) concentrations using optimized interdigital electrodes. The electrode design, with a 100 mm2 sensing area on a 64 mm × 77 mm FR-4 substrate, was improved through finite element analysis. Methanol-CBD solutions (25–1000 ppm) in 2 mL glass vials were analyzed using a vector network analyzer connected via a high-frequency SMA connector, focusing on scattering parameter (S-parameter) changes. The method demonstrated high effectiveness in CBD concentration differentiation,