Fluid property detection device

Abstract

To provide a fluid property detection device enabling monitoring for sensitively detecting a change in properties of fluid.SOLUTION: A fluid property detection device comprises: a resonance circuit 8 in which a capacitor C1 formed by a ground electrode and a detection electrode 21 immersed in fluid and an inductor portion 3101 are electrically coupled with each other; an excitation signal oscillation unit 3102 that excites the resonance circuit 8 with an excitation signal of a predetermined oscillatory frequency; and a control unit 3112 that controls the oscillatory frequency such that a phase difference between the excitation signal and an output signal of the resonance circuit 8 is maintained to be a predetermined phase difference. The fluid property detection device detects the properties of the fluid according to a change in the oscillatory frequency.SELECTED DRAWING: Figure 4

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