Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Advanced Application of Terahertz Time-domain Spectral Technique for In-situ monitoring of Microwave Vacuum Dehydration

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2022 ASABE Annual International Meeting  2200078.(doi:10.13031/aim.202200078)
Authors:   Yuqiao Ren, Da-Wen Sun
Keywords:   Beef slices, Chemometrics, Microwave vacuum dehydration, Moisture content, Terahertz time-domain spectroscopy

Abstract. An intelligent dehydration system was built by integrating a Terahertz time-domain spectroscopy (THz-TDS) system with a microwave vacuum dehydration (MVD) system to achieve in-situ monitoring of the moisture content (MC) in beef slices during dehydration processes. The THz-TDS technique was applied to capture the dynamic time-domain spectra of vapor content within the MVD system by penetrating a polyethylene air hose. Multivariate analyses, including support vector regression, Gaussian process regression, and ensemble, were applied to establish MC prediction models based on the spectral absorption coefficients of the vapor exhausted from dehydration desiccator. The established ensemble regression model obtained the highest prediction performance with R2p of 0.91 and RMSEp of 0.04744. The results reveal that the THz-TDS technique is able to sense the dynamic vapor content within the MVD system by penetrating a polyethylene air hose, and it shows great potential to be integrated into the MVD system to achieve in-situ MC evaluation of food dehydration processes.

(Download PDF)    (Export to EndNotes)