A variable temperature dielectric constant measuring cell for liquid and solid-liquid phase transition

Abstract

The invention relates to a variable-temperature dielectric constant measurement pool for liquid and solid-liquid phase change. The dielectric constant measurement pool comprises a top electrode, a bottom electrode, a protective electrode, an upper cover, an inner liner, a shell, a water inlet / outlet hole connector, a thermocouple, a BNC adapter, and the like. All the parts coordinate with each other, so that the variable-temperature dielectric constant measurement pool which is stable in structure and good in sealing property, and can regulate the temperature of a sample in real time is formed. The variable-temperature dielectric constant measurement pool for liquid and solid-liquid phase change is connected with a circulating constant-temperature water bath machine and an impedance analyzer, so that the temperature of the sample can be accurately controlled, and the dielectric constant change of the liquid can be accurately measured at the different temperature and when the solid-liquid phase change occurs; the measurement pool is stable in structure, high in vibration resistance and electromagnetic interference resistance, and high in repeatability in measured data; when the liquid has temperature change and solid-liquid phase change, the measurement pool can enable the sample to be closely contacted with an electrode, so that the reliability of the measured data is guaranteed; the cost and maintenance difficulty of dielectric variable-temperature measurement are reduced.

Description

technical field [0001] The invention relates to the measurement of the dielectric constant, in particular to a dielectric constant measuring cell when the temperature of the liquid changes and the liquid undergoes a solid-liquid phase transition. [0002] Background technique: [0003] When the temperature of the liquid changes and the liquid itself undergoes a solid-liquid phase transition, its dielectric constant is currently measured by an impedance analyzer. In conventional methods, the structural design of the measuring cell is based on the two-electrode parallel-plate capacitor method. Its structure is to use quartz fiber to separate the upper and lower electrode sheets; by measuring the capacitance of the air and the sample, the relative dielectric constant of the sample is finally obtained by using the ratio of the measured capacitance of the sample to the capacitance of the air. When adding samples, it is necessary to select the measuring cell according to the chara...

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Problems solved by technology

Therefore, when the sample volume changes, this kind of measuring cell cannot ensure a good contact between the sample and the electrode sheet, which will cause deviations in the measured dielectric constant

[0006] 3. The liquid nitrogen variable temperature furnace and the matching temperature control digital system are expensive, bulky, and consume a large amount of liquid nitrogen during operation, which limits the popularity of variable temperature measurement of samples and increases the measurement threshold and maintenance difficulty.

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