| US 7,459,920 B2 | ||
| Method of and apparatus for non-destructively measuring moisture content of dried objects | ||
| Yuzo Mizukami, Shizuoka (Japan); Yuichi Yamaguchi, Shizuoka (Japan); and Yusuke Sawai, Shizuoka (Japan) | ||
| Assigned to Incorporated Adminstrative Agency National Agriculture and Food Research Organization, Tsukuba (Japan) | ||
| Appl. No. 11/660,744 PCT Filed Aug. 23, 2004, PCT No. PCT/JP2004/012063 § 371(c)(1), (2), (4) Date Feb. 22, 2007, PCT Pub. No. WO2006/021985, PCT Pub. Date Mar. 02, 2006. |
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| Prior Publication US 2007/0241756 A1, Oct. 18, 2007 | ||
| Int. Cl. G01R 27/02 (2006.01) | ||
| U.S. Cl. 324—715 [324/444; 324/690; 324/694; 324/717; 426/231] | 1 Claim |
| 1. A method of non-destructively measuring a moisture content of dried objects, said method comprising the steps of:
introducing dried objects during a drying process into containers having different shapes and sizes;
inserting four electrode terminals into the containers;
applying an AC signal having a predetermined voltage to the electrode terminals;
measuring electrical characteristics between two electrodes based on the dried objects and inputting measurement results into
a high impedance voltmeter; and
non-destructively measuring the moisture content of the dried objects, characterized in that:
the moisture content of the dried objects is represented by calculating a ratio of an impedance to an electrostatic capacity,
wherein a ratio of an impedance to an electrostatic capacity at a frequency of 3.0 kHz represents a moisture content of tea
leaves during a tea processing.
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