Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1985-06-18
1987-06-23
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 585R, G01N 2204
Patent
active
046755950
ABSTRACT:
A method and apparatus for measuring the thickness corrected moisture ratio of a material, particularly organic material, comprising transmitting microwaves and measuring therewith the damping (A) and phase change (F1) of the microwaves upon their transmission through the material. According to the invention (W.sub.w /Y) is calculated from the expression A=(W.sub.w /Y).multidot. .multidot.k.sub.1 +k.sub.3 .multidot.t, where t is the thickness of the material (10) and where k.sub.1 and k.sub.3 are constants and the term W.sub.w /Y is the weight of the water in the material per unit area. In addition, the term (W.sub.d /Y) is determined from the expression F1=(W.sub.w /Y).multidot.k.sub.4 +(W.sub.d /Y).multidot.k.sub.5 +k.sub.6 .multidot.t in which expression the aforedetermined term W.sub.w /Y is used. The term W.sub.d /Y is the weight of the material in a dry state per unit area and k.sub.4, k.sub.5, k.sub.6 are constants. The moisture ratio is obtained in a known manner through the quotient (W.sub.w /Y)/(W.sub.d /Y). In this way the effect of the material thickness on damping (A) and phase change (F1) is included in the determination of the moisture ratio of the material.
REFERENCES:
Kraszewski: "An Improved Microwave Method . . .", IEEE Trans. on Industrial Electronics & Control-Nov. 1976-pp. 364-370.
Berliner: "Phase-Sensitive Ultrahigh-Frequency Moisture Gauge"-Ind. Lab. (U.S.A.), vol. 37-No. 10-Oct. 1971.
Jacobsen: "Dainty-Independent Moisture Meter at X-band"-10th European Microwave Conference-Sep. 1980-pp. 216-220.
Kalinski: "Microwave Attenuation Measurements . . . "-Microwave Power Symposium-Jun. 1978-pp. 142-144.
A. Kraszewski-Microwave Aquametry-A Review, 1980, pp. 209-220, Journal of Microwave Power, 15 (4).
Microwave Homodyne Systems by Ray J. King, University of Wisconsin-Published by Peter Peregrims Ltd. on behalf of the Institute of Electrical Engineers, (1978).
Eisenzopf Reinhard J.
Solis Jose M.
Stiftesen Institutet for Microvagsteknik
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