Dielectric constant measurement system and method based on multipath opening coaxial probe

Abstract

The invention discloses a dielectric constant measurement system and method based on a multipath opening coaxial probe. The system comprises a vector network analyzer, a radio frequency multipath selector switch, a reaction kettle, a multipath temperature recorder and the opening coaxial probe; the vector network analyzer, the change-over switch controller and the multipath temperature recorder are all connected with the upper computer; and the radio frequency multipath change-over switch is connected with the change-over switch controller. The vector network analyzer is connected with the movable end of the radio frequency multi-way change-over switch through a stable-phase cable, the fixed end of the radio frequency multi-way change-over switch is connected with the opening coaxial probethrough a stable-phase cable, and the terminal of the opening coaxial probe is inserted into the reaction kettle. The method comprises the following steps: (1) setting and initializing calibration; (2) performing acquisition of multipath data and calculation of compensation errors; and (3) performing correction a reflection coefficient and inversion of a dielectric constant. According to the method, the dielectric constants at different positions of the hydrate are accurately measured on the premise that sample components are not damaged, and the spatial distribution of the dielectric constants of the hydrate is accurately evaluated.

Description

technical field [0001] The invention belongs to the technical field of dielectric constant measurement, and in particular relates to a dielectric constant measurement system and a measurement method for hydrates based on a multi-channel open coaxial probe. Background technique [0002] Natural Gas Hydrate, also known as combustible ice, is an ice-like crystalline substance formed by small molecule natural gas such as methane and water under specific low temperature and high pressure conditions. It is widely distributed in seabed sediments and land permafrost. In the soil belt. Due to its wide global distribution, large energy reserves, high energy density and high resource value, natural gas hydrate has become the focus and hot spot of resource exploration and development since the 21st century. [0003] The dielectric constant is one of the important parameters to characterize the electrical properties of materials. With the deepening of hydrate exploration technology and ...

AI Technical Summary

Problems solved by technology

Vector network analyzers are expensive, and using multiple vector network analyzers will obviously result in a significant increase in cost and low measurement efficiency

[0008] The important thing is that all the moving ends and the non-moving ends inside the traditional radio frequency multi-way switch are in the same closed space. When the non-moving ends need to be selected, only the short-circuit armature is used to connect the moving ends and the non-moving ends. There is no gap between different non-moving ends. Any isolation, this method makes the crosstalk between the branches of the traditional RF multi-way switch more serious, material testing has high requirements on the quality of the microwave signal, and the errors (phase deviation, amplitude attenuation) introduced by using the traditional radio frequency multi-way switch , will cause severe distortion of the final inversion of the permittivity

Images