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In this paper we shall survey measurements of dielectric properties of materials with respect to precision. We shall consider both optimum and extreme conditions, and try to indicate the source and magnitude of errors. To better acquaint conferees (and readers) with the National Bureau of Standards, we shall choose a disproportionate share of the examples from work done or in progress at NBS.
In 1960 Gubkin1 published an electrostatic theory of piezoelectricity which did not involve the microscopic structure of the electret. This approach would seem to be a good description of the phenomenon of piezoelectricity in polymer materials, many of which are partially or completely amorphous. We applied Gubkin's model to a specific set of experimental conditions, which resulted in some simplifications...
Recently developed transformer bridges have made it possible to easily make measurements of capacitance to a few ppm (parts per million), particularly at audio frequencies. The question naturally arises: can dielectric constant and phase angle measurements be made with comparable accuracy?
The Standards Group within the Dielectrics Section of the National Bureau of Standards has undertaken an investigation with the object of producing a set of Standard Specimens with well-defined dielectric constant and loss index. An important attribute of such a group of specimens is that their electrical properties should not be subject to unpredictable change as a function of environment or time...
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