Oscillator having resonator coil immersed in a liquid mixture to determine relative amounts of two liquids

摘要

An oscillator for use in a fluid detection apparatus for determining the respective percentages of first and second liquids in a mixture disposed within a chamber, including an inductive element immersed in the mixture such that the mixture at least partially determines a value of distributed capacitance exhibited by the element when energized; where the inductive element is a coil acting as a resonant element in an oscillator, and where the oscillator is of the tuned input type such that the coil and its distributed capacitance define a parallel resonant tank circuit which generates an oscillating signal at a resonant frequency of the tank circuit, the resonant frequency being inversely proportional related to the distributed capacitance of the coil.