G - Physics – 01 – N
Patent
G - Physics
01
N
324/29.9
G01N 27/02 (2006.01)
Patent
CA 1080305
Abstract of the Disclosure An electrode is provided which is a part of an apparatus for measuring the electrical impedance of a variety of materials for the purpose of determining moisture content. The electrode is composed of a pair of spaced-apart conductors across which an electric field is radiated so that this electrical field passes through substantially all of the material sample enhancing the accuracy of the impedance measurement. A number of different embodiments of the electrode are disclosed, each embodiment being particularly sized and shaped for use with a different type of sample material. In a first embodiment, useful for measuring the moisture content of a sample of grain or the like, the electrode is shaped as a box including a flat central electrode plate vertically mounted within and electrically isolated from the enclosing grounded walls of the container. In a second embodiment, adapted for measuring the moisture content of stacked tissue paper or the like, the electrode includes a pair of opposed plates, both of which are electrically drive by a sensing circuit. In a third embodiment, particularly suited for the discrete measurement of moisture content in wood chips, the electrode is shaped as a front opening box including a flat central electrode plate mounted on and electrically isolated from a grounded backing plate. The forward walls of the box holding the wood chips are pivotally mounted at the top of the backing plate so that the lower end of the sample box opens outwardly to ensure complete dumping of the material sample. In a fourth embodiment, used to measure the moisture content of lumber as it dries in a kiln, the active electrode is shaped as an elongated cylindrical rod which is inserted into the center of the stacked lumber. Since the walls of the kiln or the rails supporting the loaded car are normally formed from a metallic material, these grounded conductors can be used in conjunction with the central active electrode to measure the impedance variations in the drying lumber.
285071
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