Permittivity measurements for roasted ground coffee versus temperature, bulk density, and moisture content
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URI: http://hdl.handle.net/10317/12895Compartir
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The conference report "Permittivity Measurements for Roasted and Ground Coffee 390 Versus Temperature, Bulk Density, and Moisture Content" had a good reception when it 391 was presented at the Fourth Global Congress on Microwave Energy Applications 392 (4th GCMEA) so the authors were encouraged by the organizers of the congress to prepare 393 this paper solely for being reviewed by the Journal of Microwave Power and 394 Electromagnetic Energy (JMPEE). This paper contains information and details that were 395 not provided in the conference material. The Fourth Global Congress on Microwave 396 Energy Applications (GCMEA) organized by Sichuan University together with The 397 China Association of Microwave Power Applications (CAMPA), was hosted in Chengdu, 398 Sichuan, China on August 17-20, 2022.Fecha de publicación
2023Editorial
Taylor & FrancisCita bibliográfica
Rafael Pérez-Campos, José Fayos-Fernández & Juan Monzó-Cabrera (2023) Permittivity measurements for roasted ground coffee versus temperature, bulk density, and moisture content, Journal of Microwave Power and Electromagnetic Energy, 57:2, 102-116, DOI: 10.1080/08327823.2023.2206666.Revisión por pares
siPalabras clave
CoffeeMicrowave resonant technique
Dielectric constant
Loss factor
Kernel permittivity
Resumen
For a large variety of food products, the moisture content can be indirectly determined by measuring their dielectric properties. In the case of coffee, the permittivity knowledge can be applied to determine the moisture content indirectly or for online moisture meters in automatic control of coffee dryers. However, there is little data on the dielectric properties of roasted ground coffee near the 2.45 GHz ISM band. In this contribution, the permittivity was measured versus temperature, bulk density, and moisture content. A resonant technique based on a coaxial microwave cavity was employed to obtain the complex permittivity as a function of those magnitudes near the 2.45 GHz ISM band. In addition, the permittivity of the coffee particle kernel has been estimated from a complex refractive index mixture equation, thus calculating the permittivity of the coffee particle kernel from the permittivity values of the mixture air-coffee (ground coffee) at different bulk densities. The results ...
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