Accurate moisture sensing is an important need for many research programs as well as in\ncontrol of industrial processes. This paper describes the development of a high accuracy frequency\ndomain sensing probe for use in obtaining dielectric measurements of materials suitable for work\nranging from 300 MHz to 1 GHz. The probe was developed to accommodate a wide range of\npermittivityâ��s ranging from �µr = 2.5 to elevated permittivityâ��s as high as �µr = 40. The design provides\na well-matched interface between the soil and the interconnecting cables. A key advantage of the\nfrequency domain approach is that a change of salt concentration has a significantly reduced effect\non �µ�¼ , versus the traditional time-domain reflectometry, TDR, measured apparent permittivity, Ka.
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