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Sensors 2014, 14(8), 15593-15609; doi:10.3390/s140815593

Use of Temperature and Humidity Sensors to Determine Moisture Content of Oolong Tea

1
Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan
2
Department of Materials Science and Engineering, National ChungHsing University, Taichung 40227, Taiwan
3
Department of Bio-industrial Mechatronics Engineering, National ChungHsing University, Taichung 40227, Taiwan
*
Author to whom correspondence should be addressed.
Received: 22 June 2014 / Revised: 19 August 2014 / Accepted: 20 August 2014 / Published: 22 August 2014
(This article belongs to the Section Physical Sensors)
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Abstract

The measurement of tea moisture content is important for processing and storing tea. The moisture content of tea affects the quality and durability of the product. Some electrical devices have been proposed to measure the moisture content of tea leaves but are not practical. Their performance is influenced by material density and packing. The official oven method is time-consuming. In this study, the moisture content of Oolong tea was measured by the equilibrium relative humidity technique. The equilibrium relative humidity, and temperature, of tea materials were measured by using temperature and relative humidity sensors. Sensors were calibrated, and calibration equations were established to improve accuracy. The moisture content was calculated by using an equilibrium moisture content model. The error of the moisture content determined with this method was within 0.5% w.b. at moisture <15% w.b. Uncertainty analysis revealed that the performance of the humidity sensor had a significant effect on the accuracy of moisture determination. View Full-Text
Keywords: moisture measurement; tea leaves; equilibrium moisture content; equilibrium relative humidity; uncertainty analysis moisture measurement; tea leaves; equilibrium moisture content; equilibrium relative humidity; uncertainty analysis
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Chen, A.; Chen, H.-Y.; Chen, C. Use of Temperature and Humidity Sensors to Determine Moisture Content of Oolong Tea. Sensors 2014, 14, 15593-15609.

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