A size determination method of a chemical substance complex dielectric constant measuring device and the measuring device

Abstract

The invention discloses a size determination method of a chemical substance complex dielectric constant measuring device and the measuring device. The method includes the following steps: S101, calculating the monotonicity of S parameters corresponding to materials inside cavities with different dimensions of cavity bodies to determine optimal size of a monotonicity curve change; S102, making a cavity body by using the cavity body corresponding to the optimal size of the monotonicity as a model; S103, connecting the cavity body with a vector network analyzer; S104, selecting a substance corresponding to a dielectric constant close to a minimum value in a dielectric constant real parameter set as a first substance, selecting a substance corresponding to a dielectric constant close to a maximum value as a second substance, and independently putting the first substance and the second substance into the formed cavity body to separately measure S parameters of the first substance and the second substance and compare the S parameters; and S105, if an error after the comparison is less than a predetermined value, regarding the cavity body as a cavity body with the optimal size.

Description

technical field [0001] The invention relates to a method for determining the size of a chemical substance complex dielectric constant measuring device and a measuring device. Background technique [0002] In the process of the interaction between microwave and various solutions, the equivalent complex dielectric constant in the solution can be said to be the most important parameter, but due to the non-equilibrium characteristics of the chemical reaction itself, there is no clear formula to calculate the dielectric constant. Therefore, the method of experimental measurement is the mainstream method now. There are also many traditional measurement methods, but all have certain limitations due to their own characteristics. For example, the resonant cavity perturbation method requires the quality factor Q of the cavity itself to be relatively high, and the sample volume is relatively small to achieve accurate measurement. Another example is that the biggest problem of the ter...

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Problems solved by technology

Another example is that the biggest problem of the terminal short-circuit method is that the calculation is very complicated, and often involves the solution of transcendental equations

The free-space method that was explored later usually uses antennas to complete the measurement, but because it has certain requirements for the sample itself, such as requiring the sample to have a relatively large area and two parallel sides to prevent wave diffraction, it also has its shortcomings.

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