High-Throughput Starch Content Estimation using RF Return Loss: Theory, Analysis and Test Instrument Design

This paper explores the application of radio frequency (RF) return loss measurements to estimate starch content in cassava, from the theoretical framework to the development of a portable test instrument utilising this method. The design evolution of the portable instrument for starch content estimation, employing RF reflectometry, is described, together with the calibration of the instrument against known starch content samples in the field. This design progression, from a basic hardware platform for proof of concept to versions with wireless connectivity, user interface enhancements, rechargeable batteries, and a focus on cost reduction and mass production suitability, has the potential to benefit farmers and further advancements in food quality assessment. Uploading of measured data from this instrument to the cloud, by means of a custom smartphone app, is also described.