Obtaining high Q resonant circuits for dielectric measurements by means of a regenerative amplifier

摘要

Power factor measurements by resonant circuit techniques are limited by losses in the resonant circuit. Essentially the methods in use measure the loss, or Q of the circuit under the two conditions: (a) dielectric sample in the circuit and (b) sample out. Sample losses are obtained by the difference of the two measurements, and in the case of polystyrene and similar low loss dielectrics at radio frequencies (1-100 mcps) the difference is a small fraction of the directly measured losses.