Paper Information (IEEE APCON Lecture Presentation) : https://epapers2.org/apscon2026/ESR/paper_details.php?paper_id=6101

This paper presents the Eco-MetaChip Mini, a novel, low-cost, and eco-friendly system for the preliminary identification of common liquids (water, ethanol, acetone, and petrol) based on changes in their relative permittivity (ϵr). The core sensing element is a flexible, biodegradable coir-rubber composite patch, an innovative material developed by Prof. Dr. Anju Pradeep and her colleagues at the School of Engineering, CUSAT. This patch is integrated into a non-contact, high frequency (approximately 100 MHz) hartley oscillator circuit, where it acts as a coupled secondary resonator. The presence of a liquid droplet on the patch significantly alters its effective dielectric constant, causing a corresponding change in the coupled magnetic field amplitude. This amplitude fluctuation is detected by a pickup coil, rectified, filtered, and then amplified to drive a visual output system using red, green, and blue LEDs. The system successfully demonstrates clear and distinct cutoff voltage responses for liquids with significantly varying dielectric constants, establishing a fast, resource-constrained, and sustainable approach to chemical sensing.

Authors : Aaromal A, Abhiram B, Deavanarayanan CR, Ivana Anto

overleaf (view) - https://www.overleaf.com/read/nyhgtsmstkff#19fe7f
slides (view) - https://docs.google.com/presentation/d/1x5XXsPy9G8DDZPQAbmEi8DTTGWBkfMIbG7OKHM-1pzM/edit?usp=sharing
APSCON26' presentation DOI (Research Gate) - https://www.researchgate.net/publication/401928480_Certificate_for_presentation

notebooklm (private) - https://notebooklm.google.com/notebook/e053b5ed-8710-4e14-8213-e6f0dfb28ae9