Meyer and schilz function to estimate common bean seed water content evaluated by radiofrequency

Scientia Agricola

Pedro Amorim Berbert²  Marília Berbert Molina¹  Alexandre Pio Viana¹  Vinícius De Oliveira Carlesso¹  Marcia Terezinha Ramos De Oliveira¹ 

[1] ,UENF CCTA Lab. de Engenharia AgrícolaCampos dos Goytacazes RJ ,Brasil

关键词: dielectric properties;    grain drying;    bulk density;    automatic control;    propriedades dielétricas;    secagem de grãos;    massa específica;    controle automático;   

DOI  :  10.1590/S0103-90162007000600002

来源: SciELO

【 摘 要 】

Derivation of density-independent dielectric functions for moisture determination in grains is important for the implementation of on-line sensors in automated driers. The object of this study was to investigate the Meyer and Schilz function [(epsilon'1)/epsilon"] for indirect and non-destructive water content measurement of seeds of common bean by radiofrequency, where epsilon' and epsilon" are the relative permittivity and the dielectric loss factor, respectively. Samples consisted of common bean seeds variety Campeão-3 at moisture contents ranging from 11.5 to 20.6% w.b., and bulk densities from 756 to 854 kg m-3, performing dielectric measurements in a room at 20 ± 1ºC and 66 ± 2% relative humidity. The model could estimate common bean seed moisture content with a standard error of the estimate, and maximum error of 0.5 and 1.0 percentage point in moisture, w.b., respectively.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License