A Terahertz time-domain spectroscopy-based intelligent microwave vacuum dehydration system for in-situ monitoring of real-time moisture migration during dehydration of agricultural products

Yuqiao Ren; Da-Wen Sun

doi:10.1117/12.2662781

28 April 2023 A Terahertz time-domain spectroscopy-based intelligent microwave vacuum dehydration system for in-situ monitoring of real-time moisture migration during dehydration of agricultural products

Yuqiao Ren, Da-Wen Sun

Author Affiliations +

Proceedings Volume 12483, Active and Passive Smart Structures and Integrated Systems XVII; 124830Q (2023) https://doi.org/10.1117/12.2662781
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States

Abstract

Microwave vacuum drying (MVD) as a novel and advanced drying technology is wildly applied in the agri-food, pharmaceutical, and electronics industry, etc. However, achieving in-situ analyses of the realtime moisture content (MC) of products during MVD is still a huge challenge. This research aims to build an intelligent dehydration system by integrating a Terahertz time-domain spectroscopy (THz- TDS) into an MVD system to achieve in-situ monitoring of real-time moisture content (MC) in agrifood products. During dehydration, the THz-TDS continuality captured the spectra from a polyethene (PE) air hose containing the exhaust water vapor from the glass desiccator. Chemometric analysis of Gaussian process regression was applied to correlate the real-time MC loss of products with the corresponding numerical integration of THz absorption coefficients of vapor. The real-time MC content was accurately calculated based on the prediction. The result shows that the THz-TDS is able to sense the dynamic vapor changes within the MVD system by penetrating the PE air hose, and the established intelligent dehydration system combined with chemometric analyses achieved a satisfied MC loss and MC prediction, with R2 of 0.95 and 0.98, and RMSE of 0.002 and 0.031, respectively. The THz-TDS technique shows great potential to be integrated into an MVD system to achieve in-situ real-time MC evaluation, optimize dehydration condition, and predict the dehydration endpoint. The established intelligent dehydration system also provides a novel sensing strategy using THz-TDS to monitor the gas exchange within a closed system by penetrating a PE air hose in the system, and further widen the application of THz-TDS in the agri-food industry.

Conference Presentation

Citation Download Citation

Yuqiao Ren and Da-Wen Sun "A Terahertz time-domain spectroscopy-based intelligent microwave vacuum dehydration system for in-situ monitoring of real-time moisture migration during dehydration of agricultural products", Proc. SPIE 12483, Active and Passive Smart Structures and Integrated Systems XVII, 124830Q (28 April 2023); https://doi.org/10.1117/12.2662781

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available