Title :
Microwave moisture sensing system in drying process for green tea production
Author :
Okamura, Seichi ; Tomita, Fumio
Author_Institution :
Electron. Eng., Shizuoka Univ., Hamamatsu, Japan
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;
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
DOI :
10.1109/IMTC.1994.351828
