Microwave moisture sensing system in drying process for green tea production

Author

Okamura, Seichi ; Tomita, Fumio

Author_Institution

Electron. Eng., Shizuoka Univ., Hamamatsu, Japan

fYear

1994

fDate

10-12 May 1994

Firstpage

1253

Abstract

A microwave moisture meter used in a drying process for green tea production is described. It can measure the leaves of green tea containing the moisture of 40 to 100 percent in dry basis. It is a transmission type of 9.4 GHz waves. To eliminate the variation in the layer thickness the sample weight is controlled. The moisture content is obtained from the ratio of the microwave attenuation to the weight of the leaves. Averaging the data with a computer the moisture content were measured in the error of 3% of moisture values. It is better than the error of the conventional measurement by the feeling of a skilled workman´s fingers actually used in factories

Keywords

drying; electric sensing devices; food processing industry; microwave measurement; moisture measurement; 9.4 GHz; drying process; green tea production; layer thickness; leaves; microwave moisture meter; moisture content; Attenuation; Computer errors; Fingers; Microwave measurements; Microwave propagation; Microwave sensors; Moisture measurement; Production systems; Temperature sensors; Thickness measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 1994. IMTC/94. Conference Proceedings. 10th Anniversary. Advanced Technologies in I & M., 1994 IEEE

Conference_Location

Hamamatsu

Print_ISBN

0-7803-1880-3

Type

conf

DOI

10.1109/IMTC.1994.351828

Filename

351828