Dielectric constant detector cell design

One of the early dielectric constant detectors was that designed by Grant [10] but the detector cell had a volume of 2-3 ml. Poppe and Kunysten (11) described a dielectric constant detector which included a reference cell for temperature compensation. The cell consisted of two stainless steel plates 2 cm x i cm X 1 mm separated by a gasket 50 pm thick. The two cells were identical and clamped back to back, sharing a common electrode. 

It follows that as the capacity (C) is directly proportional to the dielectric constant of the material between its plates, then the electrical impedance of the cell will vary inversely as the dielectric constant. The most appropriate circuit to use in dielectric constant measurement is an appropriate electrical "bridge", the detector cell being situated in one arm of the bridge. If the cell can be designed to have a capacity greater than 100 pF, then a Wein bridge can be used however such a... 

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See also in sourсe #XX -- [ ]

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