含水量
微波食品加热
校准
水分
材料科学
木屑
反射(计算机编程)
计量系统
环境科学
反射系数
波导管
生物量(生态学)
介电常数
电介质
光学
电气工程
复合材料
光电子学
工程类
制浆造纸工业
数学
计算机科学
地质学
物理
岩土工程
电信
海洋学
程序设计语言
统计
天文
作者
Sakol Julrat,Samir Trabelsi
标识
DOI:10.1016/j.biosystemseng.2019.09.013
摘要
An in-line microwave reflection measurement technique for determining moisture content of biomass material (sawdust) moving past the sensor on a conveyer is presented. The proposed system consists of four open-ended rectangular substrate-integrated waveguide (ORSIW) sensors mounted on the conveyor walls, three RF-switches and a 3.0 GHz six-port reflectometer for the reflection measurement from the sensors. The dielectric permittivity of the biomass as a function of moisture content and bulk density can be extracted by using the six-port measurement technique. The density-independent algorithm for moisture content determination was developed based on the power readings from the six-port circuit at conveyor speeds of 0.15, 0.23 and 0.35 m s−1. Finally, the predicted moisture contents were compared with those determined by the standard oven-drying method with standard errors of calibration (SEC) of 1.75%, 1.70% and 1.28% for conveyor speeds of 0.15, 0.23 and 0.35 m s−1, respectively.
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